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Dwivedi AND, Varshney A, Jain D, Singh G. CT coronary angiography as an alternative imaging method to ascertain cardiac output and its correlation with echocardiography. Clin Radiol 2023; 78:e831-e838. [PMID: 37626004 DOI: 10.1016/j.crad.2023.07.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 08/27/2023]
Abstract
AIM To assess the feasibility and accuracy of cardiac output (CO) obtained using a test bolus in patients scanned with single-source prospective-gated cardiac computed tomography (CT), and comparing it with CO obtained from unenhanced two-dimensional (2D) echocardiography using biplane Simpson's method. MATERIALS AND METHODS In the present study, 100 patients with a mean age of 55 ± 12 years who underwent coronary CT angiography with prospective electrocardiogram (ECG)-gated CT in which the scan delay was evaluated using a test bolus. The time-attenuation curves obtained from the test bolus were used to calculate the CO of the patients. The CO obtained was then compared with that obtained after follow-up 2D echocardiography using biplane modified Simpson method. RESULTS Linear regression was calculated between the CO and contrast enhancement: CO = -0.16(HUmax) + 7.65. The study showed good correlation between the two methods with r=0.77, p<0.001. On Bland-Altman analysis, no significant difference was noted between the two methods. CONCLUSION This less researched method for CO estimation appears feasible; however, the clinical usefulness of this parameter is uncertain in absence of further clinical and reference standard validation.
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Affiliation(s)
- A N D Dwivedi
- Department of Radiodiagnosis and Imaging, Institute of Medical Sciences, Banaras Hindu University, India.
| | - A Varshney
- Department of Radiodiagnosis and Imaging, Institute of Medical Sciences, Banaras Hindu University, India
| | - D Jain
- Department of Cardiology, Institute of Medical Sciences, Banaras Hindu University, India
| | - G Singh
- Centre of Biostatistics, Institute of Medical Sciences, Banaras Hindu University, India
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2
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Maroules CD, Rybicki FJ, Ghoshhajra BB, Batlle JC, Branch K, Chinnaiyan K, Hamilton-Craig C, Hoffmann U, Litt H, Meyersohn N, Shaw LJ, Villines TC, Cury RC. 2022 use of coronary computed tomographic angiography for patients presenting with acute chest pain to the emergency department: An expert consensus document of the Society of cardiovascular computed tomography (SCCT): Endorsed by the American College of Radiology (ACR) and North American Society for cardiovascular Imaging (NASCI). J Cardiovasc Comput Tomogr 2023; 17:146-163. [PMID: 36253281 DOI: 10.1016/j.jcct.2022.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 09/12/2022] [Accepted: 09/13/2022] [Indexed: 11/22/2022]
Abstract
Coronary computed tomography angiography (CTA) improves the quality of care for patients presenting with acute chest pain (ACP) to the emergency department (ED), particularly in patients with low to intermediate likelihood of acute coronary syndrome (ACS). The Society of Cardiovascular Computed Tomography Guidelines Committee was formed to develop recommendations for acquiring, interpreting, and reporting of coronary CTA to ensure appropriate, safe, and efficient use of this modality. Because of the increasing use of coronary CTA testing for the evaluation of ACP patients, the Committee has been charged with the development of the present document to assist physicians and technologists. These recommendations were produced as an educational tool for practitioners evaluating acute chest pain patients in the ED, in the interest of developing systematic standards of practice for coronary CTA based on the best available data or broad expert consensus. Due to the highly variable nature of medical care, approaches to patient selection, preparation, protocol selection, interpretation or reporting that differs from these guidelines may represent an appropriate variation based on a legitimate assessment of an individual patient's needs.
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Affiliation(s)
| | - Frank J Rybicki
- Department of Radiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Brian B Ghoshhajra
- Department of Radiology, Massachusetts General Hospital, Boston, MA, USA
| | - Juan C Batlle
- Department of Radiology, Baptist Cardiac and Vascular Institute, Miami, FL, USA
| | - Kelley Branch
- Department of Cardiology, University of Washington School of Medicine, Seattle, WA, USA
| | | | | | - Udo Hoffmann
- Department of Radiology, Massachusetts General Hospital, Boston, MA, USA
| | - Harold Litt
- Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA
| | - Nandini Meyersohn
- Department of Radiology, Massachusetts General Hospital, Boston, MA, USA
| | | | - Todd C Villines
- Department of Cardiology, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Ricardo C Cury
- Department of Radiology, Baptist Cardiac and Vascular Institute, Miami, FL, USA
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3
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Tahmasebzadeh A, Paydar R, Soltani-Kermanshahi M, Maziar A, Reiazi R. Lifetime attributable cancer risk related to prevalent CT scan procedures in pediatric medical imaging centers. Int J Radiat Biol 2021; 97:1282-1288. [PMID: 34096826 DOI: 10.1080/09553002.2021.1931527] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
PURPOSE Evaluation of the organ dose in pediatric patients up to 15 years old and Estimation of lifetime attributable risk (LAR) of cancer incidence in pediatric computed tomography procedures. MATERIALS AND METHODS Data from 532 patients below 15 years old was collected and they were categorized into four age groups of <1, 1-5, 5-10, and 10-15 years old. NCICT software was used to calculate the organ dose, and LAR of cancer incidence has been estimated according to the BEIR VII report. RESULTS The highest median dose in all age groups was related to eye lens (head scan), thyroid (chest scan), and colon (abdomen-pelvic scan). The highest average LAR of cancer incidence was observed for breast cancer and colon cancer following a chest CT scan of the youngest group (<1-year-olds) [68.23 per 100,000] and abdomen-pelvic scans of the oldest group (10- to 15-year-olds) [57.30 per 100,000]. CONCLUSION This study shows that the average LAR is higher in females and it decreases with age in both genders. Although CT scan has an indispensable application in diagnosis, the patient dose should be taken into account before any examination specifically in pediatric patients.
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Affiliation(s)
- Atefeh Tahmasebzadeh
- Student Research Committee, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Reza Paydar
- Radiation Biology Research Center, Iran University of Medical Sciences, Tehran, Iran.,Department of Radiation Science, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Mojtaba Soltani-Kermanshahi
- Social Determinants of Health Research Center, School of Medicine, Semnan University of Medical Sciences, Semnan, Iran
| | - Asghar Maziar
- Department of Radiation Science, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Reza Reiazi
- Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
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4
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Hosseini Nasab SMB, Deevband MR, Shabestani-Monfared A, Hoseini Amoli SA, Fatehi Feyzabad SH. ORGAN EQUIVALENT DOSE AND LIFETIME ATTRIBUTABLE RISK OF CANCER INCIDENCE AND MORTALITY ASSOCIATED WITH CARDIAC CT ANGIOGRAPHY. RADIATION PROTECTION DOSIMETRY 2020; 189:213-223. [PMID: 32195547 DOI: 10.1093/rpd/ncaa033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 01/08/2020] [Accepted: 02/24/2020] [Indexed: 06/10/2023]
Abstract
The aim of this study is the calculation of equivalent organ dose and estimation of lifetime attributable risk (LAR) of cancer incidence and mortality related to cardiac computed tomography angiography (CCTA) because the use of CT angiography as a noninvasive diagnostic method has increased. The organ dose has been calculated by ImPACT software based on the volumetric CT dose index (CTDIvol), and LAR of cancer risk incidence and mortality from CCTA has estimated according to the BEIR VII report. The median value of the effective dose was 13.78 ± 6.88 mSv for both genders. In all scanners, the highest median value for LAR of cancer incidence in males and females for lung cancer was 44.20 and 109.17 per 100 000, respectively. And in infants was 5.89 and 12 for lung cancer in males and breast cancer in females, respectively. Also, the median value of LAR of all cancer incidence from single CCTA in adult patients for males and females was 122 and 238 cases, respectively. Maximum LAR of cancer mortality in adults for lung cancer was 40.28 and 91.84 and in pediatrics was 5.69 and 8.50 in males and females, respectively. Despite many benefits of CTA in the heart disease evaluation, according to a high radiation dose in CCTA, to reduce the cancer risk: CCTA should be used cautiously, especially for pediatric and females.
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Affiliation(s)
| | - Mohammad Reza Deevband
- Department of Medical Physics, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ali Shabestani-Monfared
- Cancer Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Seyed Ali Hoseini Amoli
- Cardiovascular Imaging Department, Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Seyed Hasan Fatehi Feyzabad
- Cardiovascular Imaging Department, Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
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5
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Smith-Bindman R, Chu P, Wang Y, Chung R, Lopez-Solano N, Einstein AJ, Solberg L, Cervantes LF, Yellen-Nelson T, Boswell W, Delman BN, Duong PA, Goode AR, Kasraie N, Lee RK, Neill R, Pahwa A, Pike P, Roehm J, Schindera S, Starkey J, Suntharalingam S, Jeukens CRLPN, Miglioretti DL. Comparison of the Effectiveness of Single-Component and Multicomponent Interventions for Reducing Radiation Doses in Patients Undergoing Computed Tomography: A Randomized Clinical Trial. JAMA Intern Med 2020; 180:666-675. [PMID: 32227142 PMCID: PMC7105953 DOI: 10.1001/jamainternmed.2020.0064] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 01/08/2020] [Indexed: 12/27/2022]
Abstract
Importance Computed tomography (CT) radiation doses vary across institutions and are often higher than needed. Objective To assess the effectiveness of 2 interventions to reduce radiation doses in patients undergoing CT. Design, Setting, and Participants This randomized clinical trial included 864 080 adults older than 18 years who underwent CT of the abdomen, chest, combined abdomen and chest, or head at 100 facilities in 6 countries from November 1, 2015, to September 21, 2017. Data analysis was performed from October 4, 2017, to December 14, 2018. Interventions Imaging facilities received audit feedback alone comparing radiation-dose metrics with those of other facilities followed by the multicomponent intervention, including audit feedback with targeted suggestions, a 7-week quality improvement collaborative, and best-practice sharing. Facilities were randomly allocated to the time crossing from usual care to the intervention. Main Outcomes and Measures Primary outcomes were the proportion of high-dose CT scans and mean effective dose at the facility level. Secondary outcomes were organ doses. Outcomes after interventions were compared with those before interventions using hierarchical generalized linear models adjusting for temporal trends and patient characteristics. Results Across 100 facilities, 864 080 adults underwent 1 156 657 CT scans. The multicomponent intervention significantly reduced proportions of high-dose CT scans, measured using effective dose. Absolute changes in proportions of high-dose scans were 1.1% to 7.9%, with percentage reductions in the proportion of high-dose scans of 4% to 30% (abdomen: odds ratio [OR], 0.82; 95% CI, 0.77-0.88; P < .001; chest: OR, 0.92; 95% CI, 0.86-0.99; P = .03; combined abdomen and chest: OR, 0.49; 95% CI, 0.41-0.59; P < .001; and head: OR, 0.71; 95% CI, 0.66-0.76; P < .001). Reductions in the proportions of high-dose scans were greater when measured using organ doses. The absolute reduction in the proportion of high-dose scans was 6.0% to 17.2%, reflecting 23% to 58% reductions in the proportions of high-dose scans across anatomical areas. Mean effective doses were significantly reduced after multicomponent intervention for abdomen (6% reduction, P < .001), chest (4%, P < .001), and chest and abdomen (14%, P < .001) CT scans. Larger reductions in mean organ doses were 8% to 43% across anatomical areas. Audit feedback alone reduced the proportions of high-dose scans and mean dose, but reductions in observed dose were smaller. Radiologist's satisfaction with CT image quality was unchanged and high during all periods. Conclusions and Relevance For imaging facilities, detailed feedback on CT radiation dose combined with actionable suggestions and quality improvement education significantly reduced doses, particularly organ doses. Effects of audit feedback alone were modest. Trial Registration ClinicalTrials.gov Identifier: NCT03000751.
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Affiliation(s)
- Rebecca Smith-Bindman
- Department of Radiology and Biomedical Imaging, University of California, San Francisco
- Philip R. Lee Institute for Health Policy Studies, University of California, San Francisco
- Department of Epidemiology and Biostatistics, University of California, San Francisco
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco
| | - Philip Chu
- Department of Radiology and Biomedical Imaging, University of California, San Francisco
| | - Yifei Wang
- Department of Radiology and Biomedical Imaging, University of California, San Francisco
| | - Robert Chung
- Department of Demography, University of California, Berkeley
| | - Naomi Lopez-Solano
- Department of Radiology and Biomedical Imaging, University of California, San Francisco
| | - Andrew J. Einstein
- Division of Cardiology, Department of Medicine, Columbia University Irving Medical Center, New York, New York
- Department of Radiology, Columbia University Irving Medical Center, New York, New York
- New York–Presbyterian Hospital, New York, New York
| | - Leif Solberg
- HealthPartners Institute, Minneapolis, Minnesota
| | | | | | - William Boswell
- Department of Radiology, City of Hope National Medical Center, Duarte, California
| | - Bradley N. Delman
- Department of Radiology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Phuong-Anh Duong
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, Georgia
| | - Allen R. Goode
- Department of Radiology and Medical Imaging, University of Virginia Health System, Virginia
| | - Nima Kasraie
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas
| | - Ryan K. Lee
- Department of Radiology, Einstein Healthcare Network, New York, New York
| | - Rebecca Neill
- Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, Georgia
| | - Anokh Pahwa
- Department of Radiology Sciences, Olive View UCLA Medical Center, Los Angeles, California
| | | | - Jodi Roehm
- Center for Diagnostic Imaging, St Louis Park, Minnesota
| | | | - Jay Starkey
- St Luke's International Hospital, Chuo, Tokyo, Japan
| | | | - Cécile R. L. P. N. Jeukens
- Department of Radiology and Nuclear Medicine, Maastricht University Medical Center, Maastricht, the Netherlands
| | - Diana L. Miglioretti
- Division of Biostatistics, Department of Public Health Sciences, University of California Davis School of Medicine, Davis
- Kaiser Permanente Washington Health Research Institute, Seattle
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6
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LaBounty TM. Reducing Radiation Dose in Coronary Computed Tomography Angiography. JACC Cardiovasc Imaging 2020; 13:435-436. [DOI: 10.1016/j.jcmg.2019.04.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 04/12/2019] [Indexed: 10/26/2022]
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7
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Stocker TJ, Deseive S, Leipsic J, Hadamitzky M, Chen MY, Rubinshtein R, Heckner M, Bax JJ, Fang XM, Grove EL, Lesser J, Maurovich-Horvat P, Otton J, Shin S, Pontone G, Marques H, Chow B, Nomura CH, Tabbalat R, Schmermund A, Kang JW, Naoum C, Atkins M, Martuscelli E, Massberg S, Hausleiter J. Reduction in radiation exposure in cardiovascular computed tomography imaging: results from the PROspective multicenter registry on radiaTion dose Estimates of cardiac CT angIOgraphy iN daily practice in 2017 (PROTECTION VI). Eur Heart J 2019; 39:3715-3723. [PMID: 30165629 DOI: 10.1093/eurheartj/ehy546] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 08/22/2018] [Indexed: 01/12/2023] Open
Abstract
Aims Advances of cardiac computed tomography angiography (CTA) have been developed for dose reduction, but their efficacy in clinical practice is largely unknown. This study was designed to evaluate radiation dose exposure and utilization of dose-saving strategies for contrast-enhanced cardiac CTA in daily practice. Methods and results Sixty one hospitals from 32 countries prospectively enrolled 4502 patients undergoing cardiac CTA during one calendar month in 2017. Computed tomography angiography scan data and images were analysed in a central core lab and compared with a similar dose survey performed in 2007. Linear regression analysis was performed to identify independent predictors associated with dose. The most frequent indication for cardiac CTA was the evaluation of coronary artery disease in 89% of patients. The median dose-length product (DLP) of coronary CTA was 195 mGy*cm (interquartile range 110-338 mGy*cm). When compared with 2007, the DLP was reduced by 78% (P < 0.001) without an increase in non-diagnostic coronary CTAs (1.7% in 2007 vs. 1.9% in 2017 surveys, P = 0.55). A 37-fold variability in median DLP was observed between the hospitals with lowest and highest DLP (range of median DLP 57-2090 mGy*cm). Independent predictors for radiation dose of coronary CTA were: body weight, heart rate, sinus rhythm, tube voltage, iterative image reconstruction, and the selection of scan protocols. Conclusion This large international radiation dose survey demonstrates considerable reduction of radiation exposure in coronary CTA during the last decade. However, the large inter-site variability in radiation exposure underlines the need for further site-specific training and adaptation of contemporary cardiac scan protocols.
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Affiliation(s)
- Thomas J Stocker
- Medizinische Klinik und Poliklinik I, Ludwig Maximilians-Universität, Munich, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Simon Deseive
- Medizinische Klinik und Poliklinik I, Ludwig Maximilians-Universität, Munich, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | | | | | - Marcus Y Chen
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, USA
| | | | - Mathias Heckner
- Medizinische Klinik und Poliklinik I, Ludwig Maximilians-Universität, Munich, Germany
| | - Jeroen J Bax
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands
| | | | | | - John Lesser
- Minneapolis Heart Institute at Abbott Northwestern Hosptial, Minneapolis, USA
| | | | - James Otton
- Spectrum Radiology Liverpool, Sydney, Australia
| | - Sanghoon Shin
- National Health Insurance Service Ilsan Hospital, Goyang-si, South Korea
| | | | - Hugo Marques
- UNICA (cardiovascular CT and MRI Unit), Hospital da Luz, Lisboa, Portugal
| | - Benjamin Chow
- University of Ottawa Heart Institute, Ottawa, Canada
| | | | | | - Axel Schmermund
- Cardioangiologisches Centrum Bethanien (CCB), Frankfurt, Germany
| | | | | | | | | | - Steffen Massberg
- Medizinische Klinik und Poliklinik I, Ludwig Maximilians-Universität, Munich, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
| | - Jörg Hausleiter
- Medizinische Klinik und Poliklinik I, Ludwig Maximilians-Universität, Munich, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Munich Heart Alliance, Munich, Germany
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8
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Hamilton-Craig CR, Tandon K, Kwan B, DeBoni K, Burley C, Wesley AJ, O'Rourke R, Neill J, Branch KR. Coronary CT radiation dose reduction strategies at an Australian Tertiary Care Center - improvements in radiation exposure through an evidence-based approach. J Med Radiat Sci 2019; 67:25-33. [PMID: 31693313 PMCID: PMC7063243 DOI: 10.1002/jmrs.358] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 08/14/2019] [Accepted: 08/25/2019] [Indexed: 11/27/2022] Open
Abstract
Introduction Coronary CT Angiography (CCTA) is a rapidly increasing technique for coronary imaging; however, it exposes patients to ionising radiation. We examined the impact of dose reduction techniques using ECG‐triggering, kVp/mAs reduction and high‐pitch modes on radiation exposure in a large Australian tertiary CCTA service. Methods Data on acquisition modes and dose exposure were prospectively collected on all CCTA scans from November 2009 to March 2014 at an Australian tertiary care centre. A dose reduction algorithm was developed using published techniques and implemented with education of medical staff, radiographers and referrers. Associations of CCTA acquisition to radiation over time were analysed with multivariate regression. Specificity in positive CCTA was assessed by correlation with invasive coronary angiography. Results 3333 CCTAs were analysed. Mean radiation dose decreased from 8.4 mSv to 5.3, 4.4, 3.7, 2.9 and 2.8 mSv (P < 0.001) per year. Patient characteristics were unchanged. Dose reduction strategies using ECG‐triggering, kVp/mAs reduction accounted for 91% of the decrease. High‐pitch scanning reduced dose by an additional 9%. Lower dose was independently related to lower kVp, heart rate, tube current modulation, BMI, prospective triggering and high‐pitch mode (P < 0.01). CCTA specificity remained unchanged despite dose reduction. Conclusion Implementation of evidence‐based CCTA dose reduction algorithm and staff education programme resulted in a 67% reduction in radiation exposure, while maintaining diagnostic specificity. This approach is widely applicable to clinical practice for the performance of CCTA.
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Affiliation(s)
- Christian R Hamilton-Craig
- The Prince Charles Hospital, Brisbane, Queensland, Australia.,University of Queensland, Brisbane, Queensland, Australia.,Griffith University School of Medicine, Sunshine Coast, Queensland, Australia
| | | | - Bianca Kwan
- The Prince Charles Hospital, Brisbane, Queensland, Australia.,University of Queensland, Brisbane, Queensland, Australia
| | - Karen DeBoni
- The Prince Charles Hospital, Brisbane, Queensland, Australia
| | - Chris Burley
- The Prince Charles Hospital, Brisbane, Queensland, Australia
| | - Allan J Wesley
- The Prince Charles Hospital, Brisbane, Queensland, Australia.,University of Queensland, Brisbane, Queensland, Australia
| | - Rachael O'Rourke
- The Prince Charles Hospital, Brisbane, Queensland, Australia.,University of Queensland, Brisbane, Queensland, Australia
| | - Johanne Neill
- The Prince Charles Hospital, Brisbane, Queensland, Australia.,University of Queensland, Brisbane, Queensland, Australia
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9
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In vivo radiation dosimetry and image quality of turbo-flash and retrospective dual-source CT coronary angiography. Radiol Med 2019; 125:117-127. [PMID: 31686317 DOI: 10.1007/s11547-019-01103-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 10/27/2019] [Indexed: 12/18/2022]
Abstract
PURPOSE To compare measured radiation dose (MD), estimated radiation dose (ED) and image quality in coronary computed tomography between turbo-flash (TFP) and retrospective protocol (RP) and correlate MD with size-specific dose estimates (SSDE). MATERIALS AND METHODS In this prospective study, we selected 68 patients (mean age, 59.2 ± 9.7 years) undergoing 192 × 2 dual-source CT (SOMATOM Force, Siemens) to rule out coronary artery disease. Thirty-one underwent TFP and 37 RP. To evaluate in vivo MD, thermoluminescent dosimeters were placed, superficially, at thyroid and heart level, left breast areola and left hemi-thorax. MD in each site, and ED parameters, such as volume CT dose index (CTDIvol), SSDE, dose length product (DLP), effective dose (E), were compared between two protocols with a t test. Image quality was compared between two protocols. Inter-observer agreement was evaluated with a kappa coefficient (k). In each protocol, MD was correlated with SSDE using a Pearson coefficient (r). RESULTS Comparing TFP and RP, MD at thyroid (1.43 vs. 2.58 mGy; p = 0.0408), heart (3.58 vs. 28.72 mGy; p < 0.0001), left breast areola (3.00 vs. 24.21 mGy; p < 0.0001) and left hemi-thorax (2.68 vs. 24.03 mGy; p < 0.0001), CTDIvol, SSDE, DLP and E were significantly lower. Differences in image quality were not statistically significant. Inter-observer agreement was good (k = 0.796) in TFP and very good (k = 0.817) in RP. MD and SSDE excellently correlated with TFP (r = 0.9298, p < 0.0001) and RP (r = 0.9753, p < 0.0001). CONCLUSIONS With TFP, MD, CTDIvol, SSDE, DLP and E were significantly lower, than with RP. Image quality was similar between two protocols. MD correlated excellently with SSDE in each protocol.
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10
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A comparison study of radiation effective dose in ECG-Gated Coronary CT Angiography and calcium scoring examinations performed with a dual-source CT scanner. Sci Rep 2019; 9:4374. [PMID: 30867480 PMCID: PMC6416329 DOI: 10.1038/s41598-019-40758-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 02/21/2019] [Indexed: 11/08/2022] Open
Abstract
In this report we have evaluated radiation effective dose received by patients during ECG-gated CCTA examinations based on gender, heart rate, tube voltage protocol and body mass index (BMI). A total of 1,824 patients were retrospectively recruited (1,139 men and 685 women) and they were divided into Group 1 (CCTA with calcium scoring), Group 2 (CCTA without calcium scoring) and Group 3 (only calcium scoring), where the association between gender, heart rate, tube voltage protocol and body mass index (BMI) were analysed. Examinations were performed using a retrospective ECG-gated CCTA protocol and the effective doses were calculated from the dose length product with a conversion coefficient of 0.026 mSv.mGy-1cm-1. No significant differences were observed in the mean effective dose between gender in all groups. The mean estimated dose was significantly higher when the heart rate was lower in Group 1 (p < 0.001) and Group 2 (p = 0.002). There were also significant differences between the mean effective dose in tube voltage protocol and BMI among the three groups. The mean effective dose was positively correlated with BMI (p < 0.001), but inversely related to the heart rate. This study supported the theory that a high heart rate, low tube voltage and low BMI could significantly reduce radiation dose exposure.
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11
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Affiliation(s)
| | - James K Min
- Weil Cornell Medical College, New York, NY, USA
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12
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Song I, Kang JH, Kim MY, Hwang HK, Kim HY, Ko SM. Diagnostic Accuracy of Electrocardiogram-Gated Thoracic Computed Tomography Angiography without Heart Rate Control for Detection of Significant Coronary Artery Stenosis in Patients with Acute Ischemic Stroke: A Comparative Study. Korean J Radiol 2018; 19:905-915. [PMID: 30174480 PMCID: PMC6082753 DOI: 10.3348/kjr.2018.19.5.905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2017] [Accepted: 03/03/2018] [Indexed: 11/16/2022] Open
Abstract
Objective To compare the diagnostic performance of electrocardiogram (ECG)-gated thoracic computed tomography angiography (TCTA) without heart rate (HR) control in ischemic stroke patients with coronary CTA (CCTA) in non-stroke patients for detection of significant coronary artery stenosis. Materials and Methods From September 2009 through August 2014, we retrospectively enrolled 138 consecutive patients diagnosed with acute ischemic stroke who had undergone ECG-gated TCTA and conventional coronary angiography (CCA). Over the same period, we selected 167 non-stroke patients with suspected or known coronary artery disease who had undergone CCTA and CCA. With CCA as the reference standard, the diagnostic performance of TCTA and CCTA for identification of significant coronary stenosis (diameter reduction ≥ 50%) was calculated. Results There was no significant difference in baseline characteristics between TCTA (n = 132) and CCTA (n = 164), except for the higher prevalence of atrial fibrillation in the stroke group. There was significant difference (p < 0.001) between TCTA and CCTA in average HR (68 ± 12 vs. 61 ± 10 beats per minute) and image quality score (1.3 ± 0.6 vs. 1.2 ± 0.6). Significant coronary stenosis was identified in 101 (77%) patients, 179 (45%) vessels, and 293 (15%) segments of stroke patients, and in 136 (83%) patients, 259 (53%) vessels, and 404 (16%) segments of non-stroke patients. Diagnostic performance on a per-vessel and per-patient basis was similar in both TCTA and CCTA groups. There was only significant difference in area under receiver-operating characteristic curve between TCTA and CCTA groups (0.79 vs. 0.87, p < 0.001) on per-segment basis. Conclusion Electrocardiogram-gated TCTA without HR control facilitates the identification of significant coronary stenosis in patients with ischemic stroke.
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Affiliation(s)
- Inyoung Song
- Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 05030, Korea
| | - Ji Hun Kang
- Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 05030, Korea
| | - Mi Young Kim
- Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 05030, Korea
| | - Hweung Kon Hwang
- Department of Cardiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 05030, Korea
| | - Han Young Kim
- Department of Neurology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 05030, Korea
| | - Sung Min Ko
- Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 05030, Korea
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13
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Hirshfeld JW, Ferrari VA, Bengel FM, Bergersen L, Chambers CE, Einstein AJ, Eisenberg MJ, Fogel MA, Gerber TC, Haines DE, Laskey WK, Limacher MC, Nichols KJ, Pryma DA, Raff GL, Rubin GD, Smith D, Stillman AE, Thomas SA, Tsai TT, Wagner LK, Samuel Wann L, Januzzi JL, Afonso LC, Everett B, Hernandez AF, Hucker W, Jneid H, Kumbhani D, Edward Marine J, Morris PB, Piana RN, Watson KE, Wiggins BS. 2018 ACC/HRS/NASCI/SCAI/SCCT Expert Consensus Document on Optimal Use of Ionizing Radiation in Cardiovascular Imaging: Best Practices for Safety and Effectiveness. Catheter Cardiovasc Interv 2018; 92:E35-E97. [DOI: 10.1002/ccd.27659] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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14
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Hirshfeld JW, Ferrari VA, Bengel FM, Bergersen L, Chambers CE, Einstein AJ, Eisenberg MJ, Fogel MA, Gerber TC, Haines DE, Laskey WK, Limacher MC, Nichols KJ, Pryma DA, Raff GL, Rubin GD, Smith D, Stillman AE, Thomas SA, Tsai TT, Wagner LK, Wann LS. 2018 ACC/HRS/NASCI/SCAI/SCCT Expert Consensus Document on Optimal Use of Ionizing Radiation in Cardiovascular Imaging: Best Practices for Safety and Effectiveness: A Report of the American College of Cardiology Task Force on Expert Consensus Decision Pathways. J Am Coll Cardiol 2018; 71:e283-e351. [PMID: 29729877 DOI: 10.1016/j.jacc.2018.02.016] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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15
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Cernica D, Hodas R, Himcinschi E, Beganu E, Benedek T. Actual Dose-Reduction Strategies in Cardiac Computed Tomography. JOURNAL OF INTERDISCIPLINARY MEDICINE 2017. [DOI: 10.1515/jim-2017-0062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Computed tomography (CT) in cardiac examination is a powerful imaging tool that has developed rapidly during the last decade and continues to increase its potential by bringing novel technologies. Due to its noninvasive character, cardiac CT became a largely used method in detecting coronary diseases or functional issues at the expense of conventional coronary angiography. The accuracy of images has also increased, especially since new generation dual-source multi-slice detectors were developed. Although there are continuous improvements that serve to gain better-quality images, thus increasing their diagnostic accuracy, there is an inconvenient that became a serious topic for debate in the current literature: exposure to higher doses of radiation during cardiac CT examinations. Fortunately, physicians and manufacturers are taking into consideration the need to apply new strategies for radiation dose-reduction. Thus, this objective can be achieved by using patient-tailored dose-reduction strategies and by modulating the technical features of the CT scanners in order to gather high-quality images with minimal radiation exposure. The aim of this manuscript was to review the current literature data on dose-reduction strategies that are used for cardiovascular computed tomography scans.
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Affiliation(s)
- Daniel Cernica
- Center of Advanced Research in Multimodality Cardiac Imaging, Cardio Med Medical Center , Tîrgu Mureș , Romania
| | - Roxana Hodas
- Center of Advanced Research in Multimodality Cardiac Imaging, Cardio Med Medical Center , Tîrgu Mureș , Romania
| | - Elisabeta Himcinschi
- Center of Advanced Research in Multimodality Cardiac Imaging, Cardio Med Medical Center , Tîrgu Mureș , Romania
| | - Elena Beganu
- Center of Advanced Research in Multimodality Cardiac Imaging, Cardio Med Medical Center , Tîrgu Mureș , Romania
| | - Theodora Benedek
- Center of Advanced Research in Multimodality Cardiac Imaging, Cardio Med Medical Center , Tîrgu Mureș , Romania
- University of Medicine and Pharmacy , Tîrgu Mureș , Romania
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16
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Hill KD, Frush DP, Han BK, Abbott BG, Armstrong AK, DeKemp RA, Glatz AC, Greenberg SB, Herbert AS, Justino H, Mah D, Mahesh M, Rigsby CK, Slesnick TC, Strauss KJ, Trattner S, Viswanathan MN, Einstein AJ. Radiation Safety in Children With Congenital and Acquired Heart Disease: A Scientific Position Statement on Multimodality Dose Optimization From the Image Gently Alliance. JACC Cardiovasc Imaging 2017; 10:797-818. [PMID: 28514670 PMCID: PMC5542588 DOI: 10.1016/j.jcmg.2017.04.003] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 04/25/2017] [Accepted: 04/28/2017] [Indexed: 02/07/2023]
Abstract
There is a need for consensus recommendations for ionizing radiation dose optimization during multimodality medical imaging in children with congenital and acquired heart disease (CAHD). These children often have complex diseases and may be exposed to a relatively high cumulative burden of ionizing radiation from medical imaging procedures, including cardiac computed tomography, nuclear cardiology studies, and fluoroscopically guided diagnostic and interventional catheterization and electrophysiology procedures. Although these imaging procedures are all essential to the care of children with CAHD and have contributed to meaningfully improved outcomes in these patients, exposure to ionizing radiation is associated with potential risks, including an increased lifetime attributable risk of cancer. The goal of these recommendations is to encourage informed imaging to achieve appropriate study quality at the lowest achievable dose. Other strategies to improve care include a patient-centered approach to imaging, emphasizing education and informed decision making and programmatic approaches to ensure appropriate dose monitoring. Looking ahead, there is a need for standardization of dose metrics across imaging modalities, so as to encourage comparative effectiveness studies across the spectrum of CAHD in children.
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Affiliation(s)
- Kevin D Hill
- Department of Pediatrics, Duke University Medical Center, Durham, North Carolina (Image Gently Alliance representative)
| | - Donald P Frush
- Department of Radiology, Duke University Medical Center, Durham, North Carolina (Image Gently Alliance and SPR representative)
| | - B Kelly Han
- Department of Pediatric Cardiology, Children's Heart Clinic at The Children's Hospitals and Clinics of Minnesota and the Minneapolis Heart Institute, Minneapolis, Minnesota (SCCT representative)
| | - Brian G Abbott
- Department of Medicine, Warren Alpert Medical School of Brown University, Providence, Rhode Island (ASNC representative)
| | - Aimee K Armstrong
- Department of Pediatrics, Nationwide Children's Hospital, Ohio State University, Columbus, Ohio (ACC representative)
| | - Robert A DeKemp
- Department of Medicine, University of Ottawa Heart Institute, Ottawa, Ontario, Canada (SNMMI representative)
| | - Andrew C Glatz
- Department of Pediatrics, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania (Image Gently Alliance representative)
| | - S Bruce Greenberg
- Department of Radiology, Arkansas Children's Hospital, Little Rock, Arkansas (NASCI representative)
| | - Alexander Sheldon Herbert
- Department of Radiology, New York-Presbyterian Morgan Stanley Children's Hospital, New York, New York (ASRT representative)
| | - Henri Justino
- Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas (SCAI representative)
| | - Douglas Mah
- Department of Pediatrics, Boston Children's Hospital, Boston, Massachusetts (PACES representative)
| | - Mahadevappa Mahesh
- Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, Maryland (AAPM representative)
| | - Cynthia K Rigsby
- Department of Medical Imaging, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois; Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois (ACR representative)
| | - Timothy C Slesnick
- Department of Pediatrics, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia (AAP representative)
| | - Keith J Strauss
- Department of Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio (Image Gently Alliance Representative)
| | - Sigal Trattner
- Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York, New York (Image Gently Alliance representative)
| | - Mohan N Viswanathan
- Department of Internal Medicine, Stanford University, Stanford, California (HRS representative)
| | - Andrew J Einstein
- Division of Cardiology, Department of Medicine, and Department of Radiology, Columbia University Medical Center and New York-Presbyterian Hospital, New York, New York (Image Gently Alliance representative).
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17
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Silveira de Souza VV, Soares Torres F, Hochhegger B, Watte G, Sartori G, Lucchese F, Azambuja Gonçalves B. Performance of ultra-low-dose CT for the evaluation of coronary calcification: a direct comparison with coronary calcium score. Clin Radiol 2017; 72:745-750. [PMID: 28413071 DOI: 10.1016/j.crad.2017.03.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 03/15/2017] [Accepted: 03/20/2017] [Indexed: 12/20/2022]
Abstract
AIM To evaluate the diagnostic performance of ultra-low-dose computed tomography (ULDCT) in comparison to standard coronary calcium score (CCS) acquisition for the evaluation of coronary artery calcification (CAC). MATERIALS AND METHODS Standard CCS acquisition and ULDCT were performed in patients referred for coronary CT angiography for the evaluation of coronary artery disease. CAC in ULDCT was graded subjectively using a four-point scale (from 0, no calcification, to 3, severe calcification) for the complete study and for each individual coronary segment. The summation of all individual coronary segment scores generated an ULDCT total CAC score. ULDCT results were compared to standard Agatston score and sensitivity and specificity of ULDCT were calculated. RESULTS CCS and ULDCT were performed in 74 patients, with a mean DLP of 77.7 mGy·cm (±12.1) and 9.3 mGy·cm (±0.6), respectively (p<0.001). Coronary calcification was detected in 47 patients (63.5%) in standard CCS acquisition (median Agatston score of 41; interquartile range [IQR]:0263), in comparison to 42 patients (56.8%) in ULDCT (p<0.001). The sensitivity and specificity of the ULDCT total CAC score ≥1 was 80.9% and 85.2%, respectively, with an accuracy of 82.4%. The area under the receiver operating characteristic curve for the presence of CAC was 0.87. CONCLUSION ULDCT shows good sensitivity, specificity, and overall accuracy for the detection of coronary calcification with a markedly lower radiation dose in comparison to CCS. ULDCT is unlikely to miss coronary calcification in individuals with at least moderate calcium load (Agatston score >100).
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Affiliation(s)
- V V Silveira de Souza
- Santa Casa de Misericórdia de Porto Alegre, Annes Dias St 295, Porto Alegre, Rio Grande do Sul, 90020-090, Brazil.
| | - F Soares Torres
- Santa Casa de Misericórdia de Porto Alegre, Annes Dias St 295, Porto Alegre, Rio Grande do Sul, 90020-090, Brazil
| | - B Hochhegger
- Santa Casa de Misericórdia de Porto Alegre, Annes Dias St 295, Porto Alegre, Rio Grande do Sul, 90020-090, Brazil
| | - G Watte
- Santa Casa de Misericórdia de Porto Alegre, Annes Dias St 295, Porto Alegre, Rio Grande do Sul, 90020-090, Brazil
| | - G Sartori
- Santa Casa de Misericórdia de Porto Alegre, Annes Dias St 295, Porto Alegre, Rio Grande do Sul, 90020-090, Brazil
| | - F Lucchese
- Santa Casa de Misericórdia de Porto Alegre, Annes Dias St 295, Porto Alegre, Rio Grande do Sul, 90020-090, Brazil
| | - B Azambuja Gonçalves
- Santa Casa de Misericórdia de Porto Alegre, Annes Dias St 295, Porto Alegre, Rio Grande do Sul, 90020-090, Brazil
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Chinnaiyan KM, Weiner RB. Trials of Quality Improvement in Imaging. JACC Cardiovasc Imaging 2017; 10:368-378. [PMID: 28279386 DOI: 10.1016/j.jcmg.2016.12.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 12/19/2016] [Accepted: 12/21/2016] [Indexed: 10/20/2022]
Abstract
Cardiovascular imaging plays a central role in the diagnosis and treatment of cardiovascular disease. Recently, increased emphasis has been placed on quality in cardiovascular imaging, and it is becoming a central priority for various stakeholders, including patients, physicians, and payers. The changing health care landscape and associated challenges imposed on cardiac imagers, including reductions in reimbursement and growing need for pre-authorization, have also helped bring quality metrics to the forefront. Continuous quality improvement initiatives provide the framework for the team of physicians, technical staff members, administrators, and other health care professionals to deliver high-quality care. Efforts to improve quality in cardiac imaging have started to form the foundation for numerous research studies in this arena, and although few in number, randomized control trials have begun to emerge. This review highlights quality improvement studies focusing on appropriate use education, reporting, and radiation dose reduction in cardiovascular imaging.
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Affiliation(s)
| | - Rory B Weiner
- Cardiology Division, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts.
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19
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Szczykutowicz TP, Malkus A, Ciano A, Pozniak M. Tracking Patterns of Nonadherence to Prescribed CT Protocol Parameters. J Am Coll Radiol 2016; 14:224-230. [PMID: 27927592 DOI: 10.1016/j.jacr.2016.08.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 08/25/2016] [Accepted: 08/28/2016] [Indexed: 11/30/2022]
Abstract
PURPOSE Quantification of the frequency, understanding the motivation, and documentation of the changes made by CT technologists at scan time are important components of monitoring a quality CT workflow. METHODS CT scan acquisition data were collected from one CT scanner for a period of 1 year. The data included all relevant acquisition parameters needed to define the technical side of a CT protocol. An algorithm was created to sort these data in groups of irradiation events with the same combinations of scan acquisition parameters. For scans modified at scan time, it was hypothesized that these examinations would show up only once in the organized data. A classification scheme was developed to place each "one-off" examination into a category related to what motivated the scan-time change. RESULTS A total of 132,707 irradiation events were organized into 434 groups of unique scan acquisition parameters. One hundred forty-four irradiation events had acquisition parameters that showed up only once in the data. These "one-offs" were classified as follows: 25% represented rarely used protocols, 17% were due to service scans, 16% were changed for unknown and therefore undesired reasons, 15% were changed by technologists trying to adapt protocol to patient size, 12% were allowable scan-time changes, 8% of scans had tube current maxed out, and 6% of scans were changed to a higher dose mode as requested by radiologists. CONCLUSIONS The outcome of this study suggests many areas of needed technologist training and chances for optimizing this institution's CT protocols.
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Affiliation(s)
- Timothy P Szczykutowicz
- Department of Radiology, University of Wisconsin-Madison, Madison, Wisconsin; Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin; Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, Wisconsin.
| | - Annelise Malkus
- Department of Radiology, University of Wisconsin-Madison, Madison, Wisconsin
| | - Amanda Ciano
- Department of Radiology, University of Wisconsin-Madison, Madison, Wisconsin; Amanda Ciano is now an employee of GE Healthcare, Chicago, Illinois
| | - Myron Pozniak
- Department of Radiology, University of Wisconsin-Madison, Madison, Wisconsin
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Impact of institutional volume and experience with CT interpretation on sizing of transcatheter aortic valves: A multicenter retrospective study. CARDIOVASCULAR REVASCULARIZATION MEDICINE 2016; 17:566-570. [DOI: 10.1016/j.carrev.2016.08.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 08/24/2016] [Indexed: 11/17/2022]
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21
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Image Quality and Radiation Dose for Prospectively Triggered Coronary CT Angiography: 128-Slice Single-Source CT versus First-Generation 64-Slice Dual-Source CT. Sci Rep 2016; 6:34795. [PMID: 27752040 PMCID: PMC5067634 DOI: 10.1038/srep34795] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 09/19/2016] [Indexed: 12/02/2022] Open
Abstract
This study sought to compare the image quality and radiation dose of coronary computed tomography angiography (CCTA) from prospectively triggered 128-slice CT (128-MSCT) versus dual-source 64-slice CT (DSCT). The study was approved by the Medical Ethics Committee at Tongji Medical College of Huazhong University of Science and Technology. Eighty consecutive patients with stable heart rates lower than 70 bpm were enrolled. Forty patients were scanned with 128-MSCT, and the other 40 patients were scanned with DSCT. Two radiologists independently assessed the image quality in segments (diameter >1 mm) according to a three-point scale (1: excellent; 2: moderate; 3: insufficient). The CCTA radiation dose was calculated. Eighty patients with 526 segments in the 128-MSCT group and 544 segments in the DSCT group were evaluated. The image quality 1, 2 and 3 scores were 91.6%, 6.9% and 1.5%, respectively, for the 128-MSCT group and 97.6%, 1.7% and 0.7%, respectively, for the DSCT group, and there was a statistically significant inter-group difference (P ≤ 0.001). The effective doses were 3.0 mSv in the 128-MSCT group and 4.5 mSv in the DSCT group (P ≤ 0.001). Compared with DSCT, CCTA with prospectively triggered 128-MSCT had adequate image quality and a 33.3% lower radiation dose.
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22
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White S, Castellano E, Gartland N, Patel T, Padley S, Rubens M, Nicol E. Quality assurance in cardiovascular CT: a practical guide. Clin Radiol 2016; 71:729-38. [DOI: 10.1016/j.crad.2016.01.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 01/04/2016] [Accepted: 01/19/2016] [Indexed: 12/29/2022]
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Peña E, Rubens F, Stiell I, Peterson R, Inacio J, Dennie C. Efficiency and safety of coronary CT angiography compared to standard care in the evaluation of patients with acute chest pain: a Canadian study. Emerg Radiol 2016; 23:345-52. [PMID: 27220653 DOI: 10.1007/s10140-016-1407-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 05/12/2016] [Indexed: 10/21/2022]
Abstract
The optimal assessment of patients with chest pain and possible acute coronary syndrome (ACS) remains a diagnostic dilemma for emergency physicians. Cardiac computed tomographic angiography (CCTA) may identify patients who can be safely discharged home from the emergency department (ED). The objective of the study was to compare the efficiency and safety of CCTA to standard care in patients presenting to the ED with low- to intermediate-risk chest pain. This was a single-center before-after study enrolling ED patients with chest pain and low to intermediate risk of ACS, before and after implementing a cardiac CT-based management protocol. The primary outcome was efficiency (time to diagnosis). Secondary outcomes included safety (30-day incidence of major adverse cardiovascular events (MACE)) and length of stay in the ED. We enrolled 258 patients: 130 in the standard care group and 128 in the cardiac CT-based management group. The cardiac CT group had a shorter time to diagnosis of 7.1 h (IQR 5.8-14.0) compared to 532.9 h (IQR 312.8-960.5) for the standard care group (p < 0.0001) but had a longer length of stay in the ED of 7.9 h (IQR 6.5-10.8) versus 5.5 h (IQR 3.9-7.7) (p < 0.0001). The MACE rate was 1.6 % in the standard care group and 0 % in the cardiac CT group. In conclusion, a cardiac CT-based management strategy to rule out ACS in ED patients with low- to intermediate-risk chest pain was safe and led to a shorter time to diagnosis but increased length of stay in the ED.
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Affiliation(s)
- Elena Peña
- Department of Medical Imaging, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, Ontario, K1Y 4E9, Canada.,Department of Radiology, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, K1H 8M5, Canada
| | - Fraser Rubens
- Department of Surgery, Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, Ontario, K1Y 4W7, Canada
| | - Ian Stiell
- Department of Emergency Medicine, Ottawa Hospital Research Institute, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, Ontario, K1Y 4E9, Canada
| | - Rebecca Peterson
- Department of Medical Imaging, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, Ontario, K1Y 4E9, Canada.,Department of Radiology, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, K1H 8M5, Canada
| | - Joao Inacio
- Department of Medical Imaging, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, Ontario, K1Y 4E9, Canada.,Department of Radiology, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, K1H 8M5, Canada
| | - Carole Dennie
- Department of Medical Imaging, The Ottawa Hospital, 1053 Carling Avenue, Ottawa, Ontario, K1Y 4E9, Canada. .,Department of Radiology, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, K1H 8M5, Canada.
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Cohen A, Hughes K, Fahey N, Caldwell B, Wang CH, Park S. Wide Variation in Radiation Exposure During Computerized Tomography. Urology 2016; 95:47-53. [PMID: 27233928 DOI: 10.1016/j.urology.2016.05.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 05/17/2016] [Accepted: 05/18/2016] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To determine the variance in computeed tomography (CT) radiation measured via dose-length product (DLP) and effective dose (ED) during stone protocol CT scans. METHODS We retrospectively examined consecutive records of patients receiving stone protocol diagnostic CT scans (n = 1793) in 2010 and 2014 in our health system. Patient age, body mass index (BMI), and gender were recorded, along with the hospital, machine model, year, DLP, and ED of each scan. Multivariate regression was performed to identify predictive factors for increased DLP. We also collected data on head (n = 837) CT scans to serve as a comparison. RESULTS For stone CT scans, mean patient age was 55.1 ± 18.4 years with no significant difference in age (P=.2557) or BMI (P=.1794) between 2010 and 2014. Gender, BMI, and machine model were independent predictors of radiation dosage (P < .0001). Within each BMI class, there was an inexplicable 6-fold variation in the ED for the same imaging test when comparing the lowest and highest CT dose patients. There was no significant change in DLP over time for stone CT scans, but head scan patients in 2014 received lower radiation doses than those in 2010 (P < .0001). Low-dose scans for renal colic (defined as <4 mSv) were underutilized. Substantial variation exists for head scan radiation doses. CONCLUSION Our data demonstrate large variations in diagnostic CT radiation dosage. Such differences within a single institution suggest similar trends elsewhere, warranting more stringent dosage guidelines and regulations for diagnostic CT scans within institutions.
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Affiliation(s)
- Andrew Cohen
- Section of Urology, University of Chicago, Chicago, IL
| | - Katie Hughes
- Division of Urology, NorthShore University HealthSystem, Evanston, IL
| | - Natalie Fahey
- Division of Urology, NorthShore University HealthSystem, Evanston, IL
| | - Brandon Caldwell
- Division of Urology, NorthShore University HealthSystem, Evanston, IL
| | - Chi Hsiung Wang
- Division of Urology, NorthShore University HealthSystem, Evanston, IL
| | - Sangtae Park
- Division of Urology, NorthShore University HealthSystem, Evanston, IL.
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van Rosendael AR, de Graaf MA, Dimitriu-Leen AC, van Zwet EW, van den Hoogen IJ, Kharbanda RK, Bax JJ, Kroft LJ, Scholte AJ. The influence of clinical and acquisition parameters on the interpretability of adenosine stress myocardial computed tomography perfusion. Eur Heart J Cardiovasc Imaging 2016; 18:203-211. [DOI: 10.1093/ehjci/jew047] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 02/21/2016] [Indexed: 11/12/2022] Open
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Vrints CJ, Senior R, Crea F, Sechtem U. Assessing suspected angina: requiem for coronary computed tomography angiography or exercise electrocardiogram? Eur Heart J 2016; 38:1792-1800. [DOI: 10.1093/eurheartj/ehw065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Accepted: 01/29/2016] [Indexed: 01/19/2023] Open
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Durmus T, Luhur R, Daqqaq T, Schwenke C, Knobloch G, Huppertz A, Hamm B, Lembcke A. Individual selection of X-ray tube settings in computed tomography coronary angiography: Reliability of an automated software algorithm to maintain constant image quality. Eur J Radiol 2016; 85:963-71. [PMID: 27130057 DOI: 10.1016/j.ejrad.2016.03.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 02/28/2016] [Accepted: 03/02/2016] [Indexed: 11/25/2022]
Abstract
OBJECTIVES To evaluate a software tool that claims to maintain a constant contrast-to-noise ratio (CNR) in high-pitch dual-source computed tomography coronary angiography (CTCA) by automatically selecting both X-ray tube voltage and current. METHODS A total of 302 patients (171 males; age 61±12years; body weight 82±17kg, body mass index 27.3±4.6kg/cm(2)) underwent CTCA with a topogram-based, automatic selection of both tube voltage and current using dedicated software with quality reference values of 100kV and 250mAs/rotation (i.e., standard values for an average adult weighing 75kg) and an injected iodine load of 222mg/kg. RESULTS The average radiation dose was estimated to be 1.02±0.64mSv. All data sets had adequate contrast enhancement. Average CNR in the aortic root, left ventricle, and left and right coronary artery was 15.7±4.5, 8.3±2.9, 16.1±4.3 and 15.3±3.9 respectively. Individual CNR values were independent of patients' body size and radiation dose. However, individual CNR values may vary considerably between subjects as reflected by interquartile ranges of 12.6-18.6, 6.2-9.9, 12.8-18.9 and 12.5-17.9 respectively. Moreover, average CNR values were significantly lower in males than females (15.1±4.1 vs. 16.6±11.7 and 7.9±2.7 vs. 8.9±3.0, 15.5±3.9 vs. 16.9±4.6 and 14.7±3.6 vs. 16.0±4.1 respectively). CONCLUSION A topogram-based automatic selection of X-ray tube settings in CTCA provides diagnostic image quality independent of patients' body size. Nevertheless, considerable variation of individual CNR values between patients and significant differences of CNR values between males and females occur which questions the reliability of this approach.
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Affiliation(s)
- Tahir Durmus
- Department of Radiology, Charité-Universitätsmedizin Berlin, Charité Campus Mitte, Berlin, Germany.
| | - Reny Luhur
- Department of Radiology, Charité-Universitätsmedizin Berlin, Charité Campus Mitte, Berlin, Germany
| | - Tareef Daqqaq
- Department of Radiology, Charité-Universitätsmedizin Berlin, Charité Campus Mitte, Berlin, Germany
| | | | - Gesine Knobloch
- Department of Radiology, Charité-Universitätsmedizin Berlin, Charité Campus Mitte, Berlin, Germany
| | | | - Bernd Hamm
- Department of Radiology, Charité-Universitätsmedizin Berlin, Charité Campus Mitte, Berlin, Germany
| | - Alexander Lembcke
- Department of Radiology, Charité-Universitätsmedizin Berlin, Charité Campus Mitte, Berlin, Germany
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Eskandari M, Kramer CM, Hecht HS, Jaber WA, Marwick TH. Evidence Base for Quality Control Activities in Cardiovascular Imaging. JACC Cardiovasc Imaging 2016; 9:294-305. [DOI: 10.1016/j.jcmg.2015.11.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 11/06/2015] [Accepted: 11/11/2015] [Indexed: 11/28/2022]
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Arbab-Zadeh A, Di Carli MF, Cerci R, George RT, Chen MY, Dewey M, Niinuma H, Vavere AL, Betoko A, Plotkin M, Cox C, Clouse ME, Arai AE, Rochitte CE, Lima JAC, Brinker J, Miller JM. Accuracy of Computed Tomographic Angiography and Single-Photon Emission Computed Tomography-Acquired Myocardial Perfusion Imaging for the Diagnosis of Coronary Artery Disease. Circ Cardiovasc Imaging 2016; 8:e003533. [PMID: 26467105 DOI: 10.1161/circimaging.115.003533] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND Establishing the diagnosis of coronary artery disease (CAD) in symptomatic patients allows appropriately allocating preventative measures. Single-photon emission computed tomography (CT)-acquired myocardial perfusion imaging (SPECT-MPI) is frequently used for the evaluation of CAD, but coronary CT angiography (CTA) has emerged as a valid alternative. METHODS AND RESULTS We compared the accuracy of SPECT-MPI and CTA for the diagnosis of CAD in 391 symptomatic patients who were prospectively enrolled in a multicenter study after clinical referral for cardiac catheterization. The area under the receiver operating characteristic curve was used to evaluate the diagnostic accuracy of CTA and SPECT-MPI for identifying patients with CAD defined as the presence of ≥1 coronary artery with ≥50% lumen stenosis by quantitative coronary angiography. Sensitivity to identify patients with CAD was greater for CTA than SPECT-MPI (0.92 versus 0.62, respectively; P<0.001), resulting in greater overall accuracy (area under the receiver operating characteristic curve, 0.91 [95% confidence interval, 0.88-0.94] versus 0.69 [0.64-0.74]; P<0.001). Results were similar in patients without previous history of CAD (area under the receiver operating characteristic curve, 0.92 [0.89-0.96] versus 0.67 [0.61-0.73]; P<0.001) and also for the secondary end points of ≥70% stenosis and multivessel disease, as well as subgroups, except for patients with a calcium score of ≥400 and those with high-risk anatomy in whom the overall accuracy was similar because CTA's superior sensitivity was offset by lower specificity in these settings. Radiation doses were 3.9 mSv for CTA and 9.8 for SPECT-MPI (P<0.001). CONCLUSIONS CTA is more accurate than SPECT-MPI for the diagnosis of CAD as defined by conventional angiography and may be underused for this purpose in symptomatic patients. CLINICAL TRIAL REGISTRATION URL: http://www.clinicaltrials.gov. Unique identifier: NCT00934037.
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Affiliation(s)
- Armin Arbab-Zadeh
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Marcelo F Di Carli
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.).
| | - Rodrigo Cerci
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Richard T George
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Marcus Y Chen
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Marc Dewey
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Hiroyuki Niinuma
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Andrea L Vavere
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Aisha Betoko
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Michail Plotkin
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Christopher Cox
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Melvin E Clouse
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Andrew E Arai
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Carlos E Rochitte
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Joao A C Lima
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Jeffrey Brinker
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
| | - Julie M Miller
- From the Department of Medicine, Division of Cardiology, Johns Hopkins University, Baltimore, MD (A.A.-Z., R.C., R.T.G., A.L.V., J.A.C.L., J.B., J.M.M.); Department of Medicine, Division of Cardiology, Brigham and Women's Hospital, Harvard University, Boston, MA (M.D.C.); Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD (M.Y.C., A.E.A.); Department of Radiology, Charité, Berlin, Germany (M.D., M.P.); Department of Medicine, Division of Cardiology, St. Luke's Hospital, Tokyo, Japan (H.N.); Department of Epidemiology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (A.B., C.C.); Department of Radiology, Beth Israel Deaconess MC, Harvard University, Boston, MA (M.E.C.); and Department of Medicine, Division of Cardiology at the Heart Institute (InCor), University of Sao Paulo, Sao Paulo, Brazil (C.E.R.)
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Sawyer KN, Shah P, Qu L, Kurz MC, Clark CL, Swor RA. Triple Rule Out versus CT Angiogram Plus Stress Test for Evaluation of Chest Pain in the Emergency Department. West J Emerg Med 2015; 16:677-82. [PMID: 26587090 PMCID: PMC4644034 DOI: 10.5811/westjem.2015.6.25958] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 06/01/2015] [Accepted: 06/30/2015] [Indexed: 11/18/2022] Open
Abstract
Introduction Undifferentiated chest pain in the emergency department (ED) is a diagnostic challenge. One approach includes a dedicated chest computed tomography (CT) for pulmonary embolism or dissection followed by a cardiac stress test (TRAD). An alternative strategy is a coronary CT angiogram with concurrent chest CT (Triple Rule Out, TRO). The objective of this study was to describe the ED patient course and short-term safety for these evaluation methods. Methods This was a retrospective observational study of adult patients presenting to a large, community ED for acute chest pain who had non-diagnostic electrocardiograms (ECGs) and normal biomarkers. We collected demographics, ED length of stay, hospital costs, and estimated radiation exposures. We evaluated 30-day return visits for major adverse cardiac events. Results A total of 829 patients underwent TRAD, and 642 patients had TRO. Patients undergoing TRO tended to be younger (mean 52.3 vs 56.5 years) and were more likely to be male (42.4% vs. 30.4%). TRO patients tended to have a shorter ED length of stay (mean 14.45 vs. 21.86 hours), to incur less cost (median $449.83 vs. $1147.70), and to be exposed to less radiation (median 7.18 vs. 16.6mSv). No patient in either group had a related 30-day revisit. Conclusion Use of TRO is feasible for assessment of chest pain in the ED. Both TRAD and TRO safely evaluated patients. Prospective studies investigating this diagnostic strategy are needed to further assess this approach to ED chest pain evaluation.
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Affiliation(s)
- Kelly N Sawyer
- William Beaumont Hospital, Department of Emergency Medicine, Royal Oak, Michigan
| | - Payal Shah
- William Beaumont Hospital, Department of Emergency Medicine, Royal Oak, Michigan
| | - Lihua Qu
- William Beaumont Hospital, Research Institute Center for Outcomes Research, Royal Oak, Michigan
| | - Michael C Kurz
- University of Alabama School of Medicine, Department of Emergency Medicine, Birmingham, Alabama
| | - Carol L Clark
- William Beaumont Hospital, Department of Emergency Medicine, Royal Oak, Michigan
| | - Robert A Swor
- William Beaumont Hospital, Department of Emergency Medicine, Royal Oak, Michigan
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President's page - The definition of Cardiac CT = Resilience. J Cardiovasc Comput Tomogr 2015; 9:370-2. [DOI: 10.1016/j.jcct.2015.05.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Burris AC, Boura JA, Raff GL, Chinnaiyan KM. Triple Rule Out Versus Coronary CT Angiography in Patients With Acute Chest Pain. JACC Cardiovasc Imaging 2015; 8:817-25. [DOI: 10.1016/j.jcmg.2015.02.023] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 02/10/2015] [Accepted: 02/12/2015] [Indexed: 02/06/2023]
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Cademartiri F, Garot J, Tendera M, Zamorano JL. Intravenous ivabradine for control of heart rate during coronary CT angiography: A randomized, double-blind, placebo-controlled trial. J Cardiovasc Comput Tomogr 2015; 9:286-94. [DOI: 10.1016/j.jcct.2015.04.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 04/22/2015] [Accepted: 04/22/2015] [Indexed: 10/23/2022]
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Hill KD, Einstein AJ. New approaches to reduce radiation exposure. Trends Cardiovasc Med 2015; 26:55-65. [PMID: 25962784 DOI: 10.1016/j.tcm.2015.04.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 04/04/2015] [Accepted: 04/07/2015] [Indexed: 12/20/2022]
Abstract
Exposure to ionizing radiation is associated with a long-term risk of health effects, including cancer. Radiation exposure to the U.S. population from cardiac imaging has increased markedly over the past three decades. Initiatives to reduce radiation exposure have focused on the tenets of appropriate study "justification" and "optimization" of imaging protocols. This article reviews ways to optimally reduce radiation dose across the spectrum of cardiac imaging.
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Affiliation(s)
- Kevin D Hill
- Division of Pediatric Cardiology, Duke Clinical Research Institute, Duke University Medical Center, Durham, NC.
| | - Andrew J Einstein
- Division of Cardiology, Department of Medicine, Columbia University Medical Center, New York-Presbyterian Hospital, New York, NY; Department of Radiology, Columbia University Medical Center, New York-Presbyterian Hospital, New York, NY
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Abazid R, Smettei O, Sayed S, Harby FA, Habeeb AA, Saqqa HA, Mergania S, Selvanayagam JB. Objective and subjective image quality with prospectively gated versus ECG-controlled tube current modulation using 256-slice computed tomographic angiography. J Saudi Heart Assoc 2015; 27:256-63. [PMID: 26557743 PMCID: PMC4614896 DOI: 10.1016/j.jsha.2015.03.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2014] [Revised: 03/24/2015] [Accepted: 03/26/2015] [Indexed: 11/23/2022] Open
Abstract
Introduction Radiation exposure is one of the major limitations of computed tomographic coronary angiography (CTA). The purpose of this study was to compare the objective and subjective image quality and radiation dose using prospective ECG gating (PGA) versus ECG-controlled tube current modulation (ECTCM) scanning techniques. Methods A prospective, single-center study was performed at Prince Sultan Cardiac Centre, Qassim, Saudi Arabia. A total of 104 patients with low-to- intermediate probability of coronary artery disease (CAD) underwent CTA with either PGA or ECTCM acquisition. PGA was performed during the study period and compared with the last 50 CTAs previously done using ECTCM. A 4-point scale was used to assess the image quality subjectively. Objective image quality was assessed using image signal, noise, and signal-to-noise ratio (SNR). Results Patient‘s Baseline characteristics were not different between the two scanning protocols. The 4-point score of subjective image quality showed no significant differences between the PGA and ECTCM scans (2.9 ± 0.7, 2.96 ± 0.7, respectively; p = 0.87). The objective image quality showed significantly higher noise and lower SNR with PGA compared with ECTCM (31 ± 9, 27 ± 9, respectively; p < 0.001 for noise) and (15 ± 5, 17 ± 7, respectively; p < 0.001 for SNR), with no statistical difference in the image signal (434 ± 123, 425 ± 103 HU, respectively, p = 0.7). Radiation exposure was significantly lower with PGA than with ECTCM. The dose-length product (DLP) for PGA was 334 ± 130 mGy, compared with 822 ± 286 mGy for the ECTCM. This corresponds to a 59% reduction in radiation exposure (p < 0.0001). Conclusions Although prospective ECG-triggered axial scanning increased image noise, it maintained subjective image quality and was associated with a 59% reduction in radiation exposure when compared with ECTCM.
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Key Words
- BMI, body mass index
- CAD, coronary artery disease
- CTA, computed tomographic coronary angiography
- Coronary angiography
- DLP, dose-length product
- ECTCM, ECG-controlled tube current modulation
- HR, heart rate
- HU, Hounsfield unit
- Image noise
- MPR, multi-planar reconstruction
- PGA, prospective gated axial
- RGH, retrospectively-gated helical
- Radiation exposure
- SNR, signal-to-noise ratio
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Affiliation(s)
- Rami Abazid
- Prince Sultan Cardiac Center, Qassim, PSCCQ, Buraydah
| | - Osama Smettei
- Prince Sultan Cardiac Center, Qassim, PSCCQ, Buraydah
| | - Sawsan Sayed
- Prince Sultan Cardiac Center, Qassim, PSCCQ, Buraydah
| | | | | | | | | | - Joseph B Selvanayagam
- Department of Cardiovascular Medicine, Flinders Medical Centre, Flinders University of South Australia, Flinders Drive, Bedford Park, Adelaide 5042, Australia
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Radiation dose reduction at coronary artery calcium scoring by using a low tube current technique and hybrid iterative reconstruction. J Comput Assist Tomogr 2015; 39:119-24. [PMID: 25319604 DOI: 10.1097/rct.0000000000000168] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE The aim of this study was to compare the accuracy of coronary artery calcium scoring (CACS) on cardiac computed tomographic images using hybrid iterative reconstruction (hIR) and a low tube current as well as on images acquired with a filtered back projection (FBP) algorithm and a normal tube current. SUBJECTS AND METHODS Patients (N = 77) with suspected coronary artery disease were subjected to 2 CACS evaluations based on their Agatston, volume, and mass scores. One CACS evaluation was performed on images obtained with a 364-mA tube current and reconstructed with FBP; the other was performed on images obtained with a 73-mA tube current and reconstructed with hIR at iDose4. All scans were performed with the prospective electrocardiogram-triggered method using a 256-slice computed tomographic scanner (Brilliance iCT; Philips). We assessed agreement between calcium scores obtained with FBP and with IR using the percentage difference and Bland-Altman analysis. RESULTS The effective radiation doses for CACS at 80 mA s with FBP and at 16 mA s with IR were 1.20 and 0.24 mSv, respectively (k = 0.014). The mean Agatston, volume, and mass scores at 80 mA s with FBP as well as at 16 mA s with IR were 390.7, 146.5, and 63.2 as well as 377.7, 142.5, and 62.2, respectively. The percentage difference between FBP and hIR for the Agatston, volume, and mass score was 20.7%, 20.7%, and 27.1%, respectively. Bland-Altman analysis showed that there was no systemic bias. CONCLUSIONS The radiation dose for CACS can be reduced at a low tube current and hIR without affecting the calcium score.
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Meinel FG, Henzler T, Schoepf UJ, Park PW, Huda W, Spearman JV, Dyer KT, Rao AG, Hlavacek AM. ECG-synchronized CT angiography in 324 consecutive pediatric patients: spectrum of indications and trends in radiation dose. Pediatr Cardiol 2015; 36:569-78. [PMID: 25380963 DOI: 10.1007/s00246-014-1051-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 10/31/2014] [Indexed: 11/25/2022]
Abstract
The aim of the study is to describe the spectrum of indications for pediatric ECG-synchronized CT angiography (CTA), the main determinants of radiation exposure, and trends in radiation dose over time at a single, tertiary referral center. The study was IRB approved and HIPAA compliant with informed consent waived. Between 2005 and 2013, 324 pediatric patients underwent ECG-synchronized CTA to evaluate known or suspected cardiovascular abnormalities (109 female, median age 8.1 years). The effective dose (ED) was calculated using age-specific correction factors. Univariate and multivariate regression analyses were performed to identify predictors of radiation dose. The most common primary indications for the CTA examinations included known or suspected coronary pathologies (n = 166), complex congenital heart disease (n = 73), and aortic pathologies (n = 41). Median radiation exposure decreased from 12 mSv for patients examined in the years 2005-2007 to 1.2 mSv for patients examined in the years 2011-2013 (p < 0.001). Patients scanned using a tube potential of 80 kV (n = 259) had a significantly lower median radiation dose (1.4 mSv) compared to patients who were scanned at 100 kV (n = 46, median 6.3 mSv) or 120 kV (n = 19, median 19 mSv, p < 0.001). Tube voltage, followed by tube current and the method of ECG-synchronization were the strongest independent predictors of radiation dose. Growing experience with dose-saving techniques and CTA protocols tailored to the pediatric population have led to a tenfold reduction in radiation dose over recent years and now allow routinely performing ECG-synchronized CTA in children with a radiation dose on the order of 1 mSv.
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Affiliation(s)
- Felix G Meinel
- Department of Radiology and Radiological Science, Medical University of South Carolina, Ashley River Tower, 25 Courtenay Drive, MSC 226, Charleston, SC, 29401, USA
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Maurer MH, Hamm B, Huppertz A, Lembcke A. Ultra-low-dose dual-source CT coronary angiography with high pitch: diagnostic yield of a volumetric planning scan and effects on dose reduction and imaging strategy. Br J Radiol 2015; 88:20140602. [PMID: 25710210 DOI: 10.1259/bjr.20140602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVE To evaluate the role of an ultra-low-dose dual-source CT coronary angiography (CTCA) scan with high pitch for delimiting the range of the subsequent standard CTCA scan. METHODS 30 patients with an indication for CTCA were prospectively examined using a two-scan dual-source CTCA protocol (2.0 × 64.0 × 0.6 mm; pitch, 3.4; rotation time of 280 ms; 100 kV): Scan 1 was acquired with one-fifth of the tube current suggested by the automatic exposure control software [CareDose 4D™ (Siemens Healthcare, Erlangen, Germany) using 100 kV and 370 mAs as a reference] with the scan length from the tracheal bifurcation to the diaphragmatic border. Scan 2 was acquired with standard tube current extending with reduced scan length based on Scan 1. Nine central coronary artery segments were analysed qualitatively on both scans. RESULTS Scan 2 (105.1 ± 10.1 mm) was significantly shorter than Scan 1 (127.0 ± 8.7 mm). Image quality scores were significantly better for Scan 2. However, in 5 of 6 (83%) patients with stenotic coronary artery disease, a stenosis was already detected in Scan 1 and in 13 of 24 (54%) patients with non-stenotic coronary arteries, a stenosis was already excluded by Scan 1. Using Scan 2 as reference, the positive- and negative-predictive value of Scan 1 was 83% (5 of 6 patients) and 100% (13 of 13 patients), respectively. CONCLUSION An ultra-low-dose CTCA planning scan enables a reliable scan length reduction of the following standard CTCA scan and allows for correct diagnosis in a substantial proportion of patients. ADVANCES IN KNOWLEDGE Further dose reductions are possible owing to a change in the individual patient's imaging strategy as a prior ultra-low-dose CTCA scan may already rule out the presence of a stenosis or may lead to a direct transferal to an invasive catheter procedure.
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Affiliation(s)
- M H Maurer
- 1 Department of Radiology, Bern University Hospital, Inselspital, Bern, Switzerland
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Miglioretti DL, Zhang Y, Johnson E, Lee C, Morin RL, Vanneman N, Smith-Bindman R. Personalized technologist dose audit feedback for reducing patient radiation exposure from CT. J Am Coll Radiol 2014; 11:300-8. [PMID: 24589406 DOI: 10.1016/j.jacr.2013.10.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 10/15/2013] [Indexed: 12/17/2022]
Abstract
PURPOSE The aim of this study was to determine whether providing radiologic technologists with audit feedback on doses from CT examinations they conduct and education on dose-reduction strategies reduces patients' radiation exposure. METHODS This prospective, controlled pilot study was conducted within an integrated health care system from November 2010 to October 2011. Ten technologists at 2 facilities received personalized dose audit reports and education on dose-reduction strategies; 9 technologists at a control facility received no intervention. Radiation exposure was measured by the dose-length product (DLP) from CT scans performed before (n = 1,630) and after (n = 1,499) the intervention and compared using quantile regression. Technologists were surveyed before and after the intervention. RESULTS For abdominal CT, DLPs decreased by 3% to 12% at intervention facilities but not at the control facility. For brain CT, DLPs significantly decreased by 7% to 12% at one intervention facility; did not change at the second intervention facility, which had the lowest preintervention DLPs; and increased at the control facility. Technologists were more likely to report always thinking about radiation exposure and associated cancer risk and optimizing settings to reduce exposure after the intervention. CONCLUSIONS Personalized audit feedback and education can change technologists' attitudes about, and awareness of, radiation and can lower patient radiation exposure from CT imaging.
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Affiliation(s)
- Diana L Miglioretti
- Division of Biostatistics, Department of Public Health Sciences, University of California, Davis, Davis, California; Group Health Research Institute, Seattle, Washington.
| | - Yue Zhang
- Division of Epidemiology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - Eric Johnson
- Group Health Research Institute, Seattle, Washington
| | - Choonsik Lee
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institute of Health, Bethesda, Maryland
| | | | | | - Rebecca Smith-Bindman
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California; Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California; Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, San Francisco, California
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Al-Mallah MH, Aljizeeri A, Alharthi M, Alsaileek A. Routine low-radiation-dose coronary computed tomography angiography. Eur Heart J Suppl 2014. [DOI: 10.1093/eurheartj/suu024] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Barone-Rochette G, Jankowski A, Rodiere M. Apport de l’IRM et du scanner cardiaque en pratique clinique courante. Rev Med Interne 2014; 35:742-51. [DOI: 10.1016/j.revmed.2014.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 05/07/2014] [Accepted: 06/16/2014] [Indexed: 10/25/2022]
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Fazel R, Gerber TC, Balter S, Brenner DJ, Carr JJ, Cerqueira MD, Chen J, Einstein AJ, Krumholz HM, Mahesh M, McCollough CH, Min JK, Morin RL, Nallamothu BK, Nasir K, Redberg RF, Shaw LJ. Approaches to enhancing radiation safety in cardiovascular imaging: a scientific statement from the American Heart Association. Circulation 2014; 130:1730-48. [PMID: 25366837 DOI: 10.1161/cir.0000000000000048] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Education, justification, and optimization are the cornerstones to enhancing the radiation safety of medical imaging. Education regarding the benefits and risks of imaging and the principles of radiation safety is required for all clinicians in order for them to be able to use imaging optimally. Empowering patients with knowledge of the benefits and risks of imaging will facilitate their meaningful participation in decisions related to their health care, which is necessary to achieve patient-centered care. Limiting the use of imaging to appropriate clinical indications can ensure that the benefits of imaging outweigh any potential risks. Finally, the continually expanding repertoire of techniques that allow high-quality imaging with lower radiation exposure should be used when available to achieve safer imaging. The implementation of these strategies in practice is necessary to achieve high-quality, patient-centered imaging and will require a shared effort and investment by all stakeholders, including physicians, patients, national scientific and educational organizations, politicians, and industry.
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Cho I, Chang HJ, Ó Hartaigh B, Shin S, Sung JM, Lin FY, Achenbach S, Heo R, Berman DS, Budoff MJ, Callister TQ, Al-Mallah MH, Cademartiri F, Chinnaiyan K, Chow BJW, Dunning AM, DeLago A, Villines TC, Hadamitzky M, Hausleiter J, Leipsic J, Shaw LJ, Kaufmann PA, Cury RC, Feuchtner G, Kim YJ, Maffei E, Raff G, Pontone G, Andreini D, Min JK. Incremental prognostic utility of coronary CT angiography for asymptomatic patients based upon extent and severity of coronary artery calcium: results from the COronary CT Angiography EvaluatioN For Clinical Outcomes InteRnational Multicenter (CONFIRM) study. Eur Heart J 2014; 36:501-8. [PMID: 25205531 DOI: 10.1093/eurheartj/ehu358] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
AIM Prior evidence observed no predictive utility of coronary CT angiography (CCTA) over the coronary artery calcium score (CACS) and the Framingham risk score (FRS), among asymptomatic individuals. Whether the prognostic value of CCTA differs for asymptomatic patients, when stratified by CACS severity, remains unknown. METHODS AND RESULTS From a 12-centre, 6-country observational registry, 3217 asymptomatic individuals without known coronary artery disease (CAD) underwent CACS and CCTA. Individuals were categorized by CACS as: 0-10, 11-100, 101-400, 401-1000, >1000. For CCTA analysis, the number of obstructive vessels-as defined by the per-patient presence of a ≥50% luminal stenosis-was used to grade the extent and severity of CAD. The incremental prognostic value of CCTA over and above FRS was measured by the likelihood ratio (LR) χ(2), C-statistic, and continuous net reclassification improvement (NRI) for prediction, discrimination, and reclassification of all-cause mortality and non-fatal myocardial infarction. During a median follow-up of 24 months (25th-75th percentile, 17-30 months), there were 58 composite end-points. The incremental value of CCTA over FRS was demonstrated in individuals with CACS >100 (LRχ(2), 25.34; increment in C-statistic, 0.24; NRI, 0.62, all P < 0.001), but not among those with CACS ≤100 (all P > 0.05). For subgroups with CACS >100, the utility of CCTA for predicting the study end-point was evident among individuals whose CACS ranged from 101 to 400; the observed predictive benefit attenuated with increasing CACS. CONCLUSION Coronary CT angiography provides incremental prognostic utility for prediction of mortality and non-fatal myocardial infarction for asymptomatic individuals with moderately high CACS, but not for lower or higher CACS.
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Affiliation(s)
- Iksung Cho
- Division of Cardiology, Severance Cardiovascular Hospital and Severance Biomedical Science Institute, Yonsei University College of Medicine, Yonsei University Health System, 250 Seongsanno Seodaemungu, Seoul, South Korea Department of Radiology, NewYork-Presbyterian Hospital and the Weill Cornell Medical College, New York, NY, USA
| | - Hyuk-Jae Chang
- Division of Cardiology, Severance Cardiovascular Hospital and Severance Biomedical Science Institute, Yonsei University College of Medicine, Yonsei University Health System, 250 Seongsanno Seodaemungu, Seoul, South Korea
| | - Bríain Ó Hartaigh
- Department of Radiology, NewYork-Presbyterian Hospital and the Weill Cornell Medical College, New York, NY, USA
| | - Sanghoon Shin
- Division of Cardiology, Severance Cardiovascular Hospital and Severance Biomedical Science Institute, Yonsei University College of Medicine, Yonsei University Health System, 250 Seongsanno Seodaemungu, Seoul, South Korea
| | - Ji Min Sung
- Division of Cardiology, Severance Cardiovascular Hospital and Severance Biomedical Science Institute, Yonsei University College of Medicine, Yonsei University Health System, 250 Seongsanno Seodaemungu, Seoul, South Korea
| | - Fay Y Lin
- Department of Medicine, NewYork-Presbyterian Hospital and Weill Cornell Medical College, New York, NY, USA
| | | | - Ran Heo
- Department of Imaging, Cedars Sinai Medical Center, Los Angeles, CA, USA
| | - Daniel S Berman
- Department of Imaging, Cedars Sinai Medical Center, Los Angeles, CA, USA
| | - Matthew J Budoff
- Department of Medicine, Harbor UCLA Medical Center, Los Angeles, CA, USA
| | | | - Mouaz H Al-Mallah
- Department of Medicine, Wayne State University, Henry Ford Hospital, Detroit, MI, USA
| | - Filippo Cademartiri
- Cardiovascular Imaging Unit, Giovanni XXIII Hospital, Monastier, Treviso, Italy Department of Radiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | | | - Benjamin J W Chow
- Department of Medicine and Radiology, University of Ottawa, Ottawa, ON, Canada
| | | | | | - Todd C Villines
- Department of Medicine, Walter Reed Medical Center, Washington, DC, USA
| | - Martin Hadamitzky
- Division of Cardiology, Deutsches Herzzentrum Munchen, Munich, Germany
| | - Joerg Hausleiter
- Medizinische Klinik I der Ludwig-Maximilians-Universität München, Munich, Germany
| | - Jonathon Leipsic
- Department of Medicine and Radiology, University of British Columbia, Vancouver, BC, Canada
| | - Leslee J Shaw
- Division of Cardiology, Emory University School of Medicine, Atlanta, GA, USA
| | | | | | - Gudrun Feuchtner
- Department of Radiology, Medical University of Innsbruck, Innsbruck, Austria
| | - Yong-Jin Kim
- Seoul National University Hospital, Seoul, South Korea
| | - Erica Maffei
- Cardiovascular Imaging Unit, Giovanni XXIII Hospital, Monastier, Treviso, Italy Department of Radiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | | | - Gianluca Pontone
- Department of Clinical Sciences and Community Health, University of Milan, Centro Cardiologico Monzino, IRCCS, Milan, Italy
| | - Daniele Andreini
- Department of Clinical Sciences and Community Health, University of Milan, Centro Cardiologico Monzino, IRCCS, Milan, Italy
| | - James K Min
- Department of Radiology, NewYork-Presbyterian Hospital and the Weill Cornell Medical College, New York, NY, USA
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Low Radiation Coronary CT. CURRENT CARDIOVASCULAR IMAGING REPORTS 2014. [DOI: 10.1007/s12410-014-9284-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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An J, Shim JH, Kim SO, Lee D, Kim KM, Lim YS, Lee HC, Chung YH, Lee YS. Prevalence and prediction of coronary artery disease in patients with liver cirrhosis: a registry-based matched case-control study. Circulation 2014; 130:1353-62. [PMID: 25095888 DOI: 10.1161/circulationaha.114.009278] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND There is conflict regarding the prevalence of coronary artery disease (CAD) in patients with liver cirrhosis. This study aimed to investigate the prevalence of silent CAD in comparison with the general population, and to identify the relevant risk factors in patients with liver cirrhosis. METHODS AND RESULTS This retrospective study included 1045 prospectively registered consecutive patients with liver cirrhosis without any history of chest pain or CAD, who underwent computerized coronary angiography as a pretransplant workup. These were matched with 6283 controls with healthy livers, based on propensity scores according to established cardiovascular risk factors. Obstructive CAD was defined as ≥50% luminal narrowing in any artery. A matched analysis of 853 pairs showed that the proportion of subjects with obstructive CAD did not differ significantly between the cirrhotic and control groups (7.2% versus 7.9%, P=0.646), in agreement with the outcome of multivariate analysis for its predictors, with an adjusted odds ratio for liver cirrhosis of 1.06 (P=0.690). Nonobstructive CAD was more prevalent in the matched cirrhotic cases (30.6% versus 23.4%, P=0.001). In the pooled cirrhotic cohort, older age, male sex, hypertension, diabetes mellitus, and alcoholic cirrhosis were independently associated with obstructive CAD (adjusted odds ratios, 1.07, 2.74, 1.69, 2.37, and 2.17, respectively; P<0.05 for all), whereas liver function and coagulation parameters were not. CONCLUSIONS Asymptomatic cirrhotic patients and nonhepatic subjects are similar in terms of the prevalence of occult obstructive CAD. Traditional cardiovascular risk factors are related to critical coronary stenosis in cirrhotic patients, and thus may be helpful indicators for more careful preoperative evaluation of coronary risk.
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Affiliation(s)
- Jihyun An
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.)
| | - Ju Hyun Shim
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.).
| | - Seon-Ok Kim
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.)
| | - Danbi Lee
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.)
| | - Kang Mo Kim
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.)
| | - Young-Suk Lim
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.)
| | - Han Chu Lee
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.)
| | - Young-Hwa Chung
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.)
| | - Yung Sang Lee
- From the Department of Gastroenterology, Asan Liver Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (J.A., J.H.S., D.L., K.M.K., Y.-S.L., H.C.L., Y.-H.C., Y.S.L.); and the Department of Biostatistics and Clinical Epidemiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea (S.-O.K.)
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Krazinski AW, Meinel FG, Schoepf UJ, Silverman JR, Canstein C, De Cecco CN, Geyer LL. Reduced radiation dose and improved image quality at cardiovascular CT angiography by automated attenuation-based tube voltage selection: intra-individual comparison. Eur Radiol 2014; 24:2677-84. [PMID: 25052076 DOI: 10.1007/s00330-014-3312-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 05/14/2014] [Accepted: 07/03/2014] [Indexed: 11/27/2022]
Abstract
OBJECTIVES To evaluate the effect of automated tube voltage selection on radiation dose and image quality at cardiovascular CT angiography (CTA). METHODS We retrospectively analysed paired studies in 72 patients (41 male, 60.5 ± 16.5 years), who had undergone CTA acquisitions of the heart or aorta both before and after the implementation of an automated x-ray tube voltage selection algorithm (ATVS). All other parameters were kept identical between the two acquisitions. Subjective image quality (IQ) was rated and objective IQ was measured by image noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and figure of merit (FOM). Image quality parameters and effective dose were compared between acquisitions. RESULTS Overall subjective image quality improved with the percentage of cases scored as adequate or higher increasing from 79 % to 92 % after implementation of ATVS (P = 0.03). SNR (14.1 ± 5.9, 15.7 ± 6.1, P = 0.009), CNR (11.6 ± 5.3, 13.2 ± 5.6, P = 0.011), and FOM (19.9 ± 23.3, 43.8 ± 51.1, P < 0.001) were significantly higher after implementation of ATVS. Mean image noise (24.1 ± 8.4 HU, 22.7 ± 7.1 HU, P = 0.048) and mean effective dose (10.6 ± 5.9 mSv, 8.8 ± 5.0 mSv, P = 0.003) were significantly lower after implementation of ATVS. CONCLUSIONS Automated tube voltage selection can operator-independently optimize cardiovascular CTA image acquisition parameters with improved image quality at reduced dose. KEY POINTS • Automatic tube voltage selection optimizes tube voltage for each individual patient. • In this population, overall radiation dose decreased while image quality improved. • This tool may become valuable for improving dose/quality ratio.
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Affiliation(s)
- Aleksander W Krazinski
- Department of Radiology and Radiological Science, Medical University of South Carolina, Ashley River Tower, MSC 226 25 Courtenay Drive, Charleston, SC, 29425, USA
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Rubin GD, Leipsic J, Joseph Schoepf U, Fleischmann D, Napel S. CT angiography after 20 years: a transformation in cardiovascular disease characterization continues to advance. Radiology 2014; 271:633-52. [PMID: 24848958 DOI: 10.1148/radiol.14132232] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Through a marriage of spiral computed tomography (CT) and graphical volumetric image processing, CT angiography was born 20 years ago. Fueled by a series of technical innovations in CT and image processing, over the next 5-15 years, CT angiography toppled conventional angiography, the undisputed diagnostic reference standard for vascular disease for the prior 70 years, as the preferred modality for the diagnosis and characterization of most cardiovascular abnormalities. This review recounts the evolution of CT angiography from its development and early challenges to a maturing modality that has provided unique insights into cardiovascular disease characterization and management. Selected clinical challenges, which include acute aortic syndromes, peripheral vascular disease, aortic stent-graft and transcatheter aortic valve assessment, and coronary artery disease, are presented as contrasting examples of how CT angiography is changing our approach to cardiovascular disease diagnosis and management. Finally, the recently introduced capabilities for multispectral imaging, tissue perfusion imaging, and radiation dose reduction through iterative reconstruction are explored with consideration toward the continued refinement and advancement of CT angiography.
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Affiliation(s)
- Geoffrey D Rubin
- From the Duke Clinical Research Institute, 2400 Pratt St, Box 17969, Durham, NC 27715 (G.D.R.); Department of Medical Imaging and Division of Cardiology, University of British Columbia, Vancouver, BC, Canada (J.L.); Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC (U.J.S.); and Department of Radiology, Stanford University School of Medicine, Stanford, Calif (D.F., S.N.)
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Raff GL, Chinnaiyan KM, Cury RC, Garcia MT, Hecht HS, Hollander JE, O'Neil B, Taylor AJ, Hoffmann U. SCCT guidelines on the use of coronary computed tomographic angiography for patients presenting with acute chest pain to the emergency department: A Report of the Society of Cardiovascular Computed Tomography Guidelines Committee. J Cardiovasc Comput Tomogr 2014; 8:254-71. [DOI: 10.1016/j.jcct.2014.06.002] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 06/04/2014] [Indexed: 02/06/2023]
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Wang G, Gao J, Zhao S, Sun X, Chen X, Cui X. Achieving consistent image quality and overall radiation dose reduction for coronary CT angiography with body mass index-dependent tube voltage and tube current selection. Clin Radiol 2014; 69:945-51. [PMID: 24909505 DOI: 10.1016/j.crad.2014.04.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 04/13/2014] [Accepted: 04/16/2014] [Indexed: 11/16/2022]
Abstract
AIM To develop a quantitative body mass index (BMI)-dependent tube voltage and tube current selection method for obtaining consistent image quality and overall dose reduction in computed tomography coronary angiography (CTCA). METHODS AND MATERIALS The images of 190 consecutive patients (group A) who underwent CTCA with fixed protocols (100 kV/193 mAs for 100 patients with a BMI of <27 and 120 kV/175 mAs for 90 patients with a BMI of >27) were retrospectively analysed and reconstructed with an adaptive statistical iterative reconstruction (ASIR) algorithm at 50% blending. Image noise was measured and the relationship to BMI was studied to establish BMI-dependent tube current for obtaining CTCA images with user-specified image noise. One hundred additional cardiac patients (group B) were examined using prospective triggering with the BMI-dependent tube voltage/current. CTCA image-quality score, image noise, and effective dose from groups B and C (subgroup of A of 100 patients examined with prospective triggering only) were obtained and compared. RESULTS There was a linear relationship between image noise and BMI in group A. Using a BMI-dependent tube current in group B, an average CTCA image noise of 27.7 HU (target 28 HU) and 31.7 HU (target 33 HU) was obtained for the subgroups of patients with BMIs of >27 and of <27, respectively, and was independent of patient BMI. There was no difference between image-quality scores between groups B and C (4.52 versus 4.60, p > 0.05). The average effective dose for group B (2.56 mSv) was 42% lower than group C (4.38 mSv; p < 0.01). CONCLUSION BMI-dependent tube voltage/current selection in CTCA provides an individualized protocol that generates consistent image quality and helps to reduce overall patient radiation dose.
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Affiliation(s)
- G Wang
- Department of Radiology, The General Hospital of Chinese People's Armed Police Forces, Beijing, China
| | - J Gao
- Department of Radiology, The General Hospital of Chinese People's Armed Police Forces, Beijing, China.
| | - S Zhao
- Department of Radiology, The General Hospital of Chinese People's Armed Police Forces, Beijing, China
| | - X Sun
- Department of Radiology, The General Hospital of Chinese People's Armed Police Forces, Beijing, China
| | - X Chen
- Department of Radiology, The General Hospital of Chinese People's Armed Police Forces, Beijing, China
| | - X Cui
- Department of Radiology, The General Hospital of Chinese People's Armed Police Forces, Beijing, China
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Shmilovich H, Cheng VY, Dey D, Rajani R, Nakazato R, Otaki Y, Nakanishi R, Vashistha V, Min JK, Berman DS. Optimizing image contrast display improves quantitative stenosis measurement in heavily calcified coronary arterial segments on coronary CT angiography: A proof-of-concept and comparison to quantitative invasive coronary angiography. Acad Radiol 2014; 21:797-804. [PMID: 24809320 DOI: 10.1016/j.acra.2014.02.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Revised: 02/23/2014] [Accepted: 02/25/2014] [Indexed: 11/18/2022]
Abstract
RATIONALE AND OBJECTIVES Blooming artifact from calcified plaques often renders measurement of stenosis impossible on coronary computed tomographic angiography (CTA). We sought to evaluate the impact of modifying window level on reducing blooming artifact, and its impact on stenosis quantification. MATERIALS AND METHODS We analyzed 125 calcified segments from 53 patients who underwent CTA and invasive coronary angiography (ICA). Segmental stenosis on CTA was measured using three window settings: width of 1000 Hounsfield units (HU) and level of 200 HU ("default"), 1500/200 HU ("widened"), and width and level based on the mean HU of the calcified plaque and pericoronary fat ("calcium-specific"). Segmental stenosis on ICA was quantified by a blinded experienced reader. RESULTS ICA found ≥50% stenosis in 30 segments. Displaying segments with widened and calcium-specific settings improved overall accuracy of detecting ≥50% stenosis (P's < 0.001) by increasing the rate of accurately quantifying <50% stenosis (P's < 0.001), and improved correlation of stenosis quantification to ICA (P's < 0.05). There was no difference in stenosis quantification accuracy between widened and calcium-specific window settings. Limits of agreement between CTA stenosis quantification and ICA narrowed with widened and calcium-specific settings. CONCLUSIONS We showed for the first time that in calcified segments, widening display window width significantly improved CTA quantification of stenosis compared to ICA.
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Affiliation(s)
- Haim Shmilovich
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048.
| | - Victor Y Cheng
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048
| | - Damini Dey
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048
| | - Ronak Rajani
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048
| | - Ryo Nakazato
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048
| | - Yuka Otaki
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048
| | - Rine Nakanishi
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048
| | | | - James K Min
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048
| | - Daniel S Berman
- Department of Medicine and Cardiac Imaging, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Taper Building No. 1258, Los Angeles, CA 90048
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