1
|
Tian M, Mu X, Fan D, Liu Z, Liu Q, Yue K, Song Z, Luo J, Zhang S. A Transformable Mucoadhesive Microgel Network for Noninvasive Multimodal Imaging And Radioprotection of a Large Area of the Gastrointestinal Tract. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2303436. [PMID: 37364891 DOI: 10.1002/adma.202303436] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 06/04/2023] [Indexed: 06/28/2023]
Abstract
The lack of noninvasive imaging and modulation of a large area of the gastrointestinal (GI) tract constrain the diagnosis and treatment of many GI-related diseases. Recent advances use novel mucoadhesive materials to coat a part of the GI tract and then modulate its functions. High mucoadhesion is the key factor of the partial coating, but also the limitation for not spreading and covering the lower GI tract. Here, a bismuth-pectin organic-inorganic hybrid complex is screened and engineered into a transformable microgel network (Bi-GLUE) with high flowability and mucoadhesion, such that it can quickly transit through and coat a large area of the GI tract. In murine and porcine models, Bi-GLUE delivers contrast agents to achieve real-time, large-area GI-tract imaging under X-ray or magnetic resonance modalities and to facilitate the non-invasive diagnosis of familial adenomatous polyposis. Moreover, Bi-GLUE, like an intracorporal radiation shield, decreases the radiotoxicity in a whole-abdomen irradiation rat model. This transformable microgel network offers a new direction that can modulate a large area of the GI tract and may have broad applications for GI-related conditions.
Collapse
Affiliation(s)
- Meng Tian
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Xin Mu
- Advanced Therapies, Siemens Healthineers Ltd., Shanghai, 200126, China
- School of Biomedical Engineering, ShanghaiTech University, Shanghai, 201210, China
| | - Dongyue Fan
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
- Einthoven Laboratory for Vascular and Regenerative Medicine, Division of Thrombosis and Hemostasis, Department of Internal Medicine, Leiden University Medical Center, Leiden, 2333 ZA, Netherlands
| | - Zhen Liu
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Qi Liu
- South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou, 510640, China
| | - Kan Yue
- South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou, 510640, China
| | - Zhiling Song
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Jie Luo
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| | - Shiyi Zhang
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China
| |
Collapse
|
2
|
Mainprize JG, Yaffe MJ, Chawla T, Glanc P. Effects of ionizing radiation exposure during pregnancy. Abdom Radiol (NY) 2023; 48:1564-1578. [PMID: 36933026 PMCID: PMC10024285 DOI: 10.1007/s00261-023-03861-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 03/19/2023]
Abstract
PURPOSE To review the effects of ionizing radiation to the conceptus and the relationship to the timing of the exposure during pregnancy. To consider strategies that would mitigate potential harms associated with exposure to ionizing radiation during pregnancy. METHODS Data reported in the peer-reviewed literature on entrance KERMA received from specific radiological examinations were combined with published results from experiment or Monte Carlo modeling of tissue and organ doses per entrance KERMA to estimate total doses that could be received from specific procedures. Data reported in the peer-reviewed literature on dose mitigation strategies, best practices for shielding, consent, counseling and emerging technologies were reviewed. RESULTS For procedures utilizing ionizing radiation for which the conceptus is not included in the primary radiation beam, typical doses are well below the threshold for causing tissue reactions and the risk of induction of childhood cancer is low. For procedures that include the conceptus in the primary radiation field, longer fluoroscopic interventional procedures or multiphase/multiple exposures potentially could approach or exceed thresholds for tissue reactions and the risk of cancer induction must be weighed against the expected risk/benefit of performing (or not) the imaging examination. Gonadal shielding is no longer considered best practice. Emerging technologies such as whole-body DWI/MRI, dual-energy CT and ultralow dose studies are gaining importance for overall dose reduction strategies. CONCLUSION The ALARA principle, considering potential benefits and risks should be followed with respect to the use of ionizing radiation. Nevertheless, as Wieseler et al. (2010) state, "no examination should be withheld when an important clinical diagnosis is under consideration." Best practices require updates on current available technologies and guidelines.
Collapse
Affiliation(s)
- James G. Mainprize
- Physical Sciences Platform, Sunnybrook Research Institute, 2075 Bayview Ave., Rm S632/S657, Toronto, ON M4N 3M5 Canada
| | - Martin J. Yaffe
- Physical Sciences Platform, Sunnybrook Research Institute, 2075 Bayview Ave., Rm S632/S657, Toronto, ON M4N 3M5 Canada
- Departments of Medical Biophysics and Medical Imaging, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Ave., Rm S657, Toronto, ON M4N 3M5 Canada
| | - Tanya Chawla
- Joint Department of Medical Imaging, Mount Sinai Hospital, University of Toronto, 600 University Avenue, Toronto, ON M5G 1X5 Canada
| | - Phyllis Glanc
- Departments Medical Imaging, Obstetrics & Gynecology, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Rm MG 160, Toronto, ON M4N 3M5 Canada
| |
Collapse
|
3
|
Imaging modalities and optimized imaging protocols in pregnant patients with cancer. ABDOMINAL RADIOLOGY (NEW YORK) 2023; 48:1579-1589. [PMID: 36688976 DOI: 10.1007/s00261-023-03798-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 12/29/2022] [Accepted: 01/02/2023] [Indexed: 01/24/2023]
Abstract
Medical imaging during pregnancy may be necessary to diagnose conditions that affect the outcome of the mother and fetus. Diagnosis and staging of cancer in pregnant women can be particularly challenging due to fear of inherent risk to the fetus, lack of standardized imaging protocols, and ethical challenges posed while choosing the best imaging option. Ultrasound and MRI, due to lack of ionizing radiation, are preferred over CT and nuclear imaging. The latter may be considered only if the benefits of imaging outweigh maternal and fetal risk without exceeding the cumulative established fetal radiation dose threshold. This article provides an overview of all currently available imaging options that can be used for imaging cancer during pregnancy to support the best possible maternal and fetal outcomes.
Collapse
|
4
|
Using barium as an internal radioprotective shield for pregnant patients undergoing CT pulmonary angiography: A retrospective study. Phys Med 2022; 102:27-32. [PMID: 36049319 DOI: 10.1016/j.ejmp.2022.08.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 08/05/2022] [Accepted: 08/17/2022] [Indexed: 11/21/2022] Open
Abstract
PURPOSE The purpose of our retrospective study was to assess the effect of barium sulfate contrast medium on radiation dose and diagnostic quality of CT Pulmonary Angiography (CTPA) in an in-vivo study of pregnant patients. METHODS Our retrospective study included 33 pregnant patients who underwent CTPA to exclude pulmonary embolism. The patients received oral 40% w/v barium solution just prior to the acquisition of their planning radiograph. All CTPA were performed on 64-slice, single-source CT scanners with AEC with noise index = 28.62-31.64 and the allowed mA range of 100-450. However, only 5/33 patients had mA modulation (AEC 100-450 mA range), while 28/33 patients had mA maxed out at the set maximum mA of 450 over the entire scan range. We recorded CTDIvol (mGy), DLP (mGy.cm) and scan length. The same information was recorded in weight-and scanner-matched, non-pregnant patients. Statistical tests included descriptive data (median and interquartile range) and Mann-Whitney test. RESULTS There were no significant differences in CTDIvol and DLP between the barium and control group patients (p > 0.1). The median mA below the diaphragm was significantly higher in each patient with barium compared to the weight and scanner-matched patient without barium. Evaluation of lung and subsegmental lower lobe pulmonary arteries was limited in 85% barium group. Due to thin prospective section thickness (1.25 mm), most patients were scanned at maximum allowed mA for AEC. CONCLUSION Use of AEC with thick barium in pregnant patients undergoing CTPA as an internal radioprotective shield produces counterproductive artifacts and tube current increments.
Collapse
|
5
|
Gilligan P, Damilakis J. Patient shielding: The need for a European consensus statement. Phys Med 2021; 82:266-268. [PMID: 33684698 DOI: 10.1016/j.ejmp.2021.01.077] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/26/2021] [Accepted: 01/29/2021] [Indexed: 12/25/2022] Open
Abstract
Contact shielding has been in widespread use for the last 60-70 years aiming to protect against genetic effects, cancer, and other detriment. Since 2012, studies have begun to appear in the literature that question the continued use of such shielding, especially when radiographic technology has changed so much over the intervening period This literature has culminated in several professional bodies such as the American Association of Physicists in Medicine (AAPM) and the British Institute of Radiology (BIR) issuing guidance and statements recommending against the continued routine use of patient contact shielding. Many professional societies have also endorsed these statements. National statements on the matter continue to be produced. It is notable however that the major European bodies involved in diagnostic radiology and radiation safety have not to date issued a statement on patient shielding. This commentary looks at reasons for that and argues that it is now time for a European consensus statement on patient shielding. It is the authors belief that there are advantages to building on the work done by the AAPM and BIR, using the opportunity to amplify the statements, propagate the intent of the original statements, refine the message to deal with questions that have arisen since their publication. Α working group, Gonad and Patient Shielding (GAPS) has been formed by members from a) the European Federation of Organisations for Medical Physics (EFOMP), b) the Eurosafe Imaging initiative of the European Society of Radiology (ESR), c) the European Federation of Radiographers Societies (EFRS), d) EURADOS and e) the BIR to produce a joint statement on the proper application of patient shielding in diagnostic and interventional radiology.
Collapse
Affiliation(s)
- P Gilligan
- Mater Private Hospital, Eccles St., Dublin 7, Ireland; University of Crete, Iraklion, Crete, Greece
| | - J Damilakis
- Mater Private Hospital, Eccles St., Dublin 7, Ireland; University of Crete, Iraklion, Crete, Greece
| |
Collapse
|
6
|
Mathur S, Pillenahalli Maheshwarappa R, Fouladirad S, Metwally O, Mukherjee P, Lin AW, Bharatha A, Nicolaou S, Ditkofsky NG. Emergency Imaging in Pregnancy and Lactation [Formula: see text]. Can Assoc Radiol J 2020; 71:396-402. [PMID: 32157904 DOI: 10.1177/0846537120906482] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The use of diagnostic imaging studies in the emergency setting has increased dramatically over the past couple of decades. The emergency imaging of pregnant and lactating patients poses unique challenges and calls upon the crucial role of radiologists as consultants to the referring physician to guide appropriate use of imaging tests, minimize risk, ensure timely management, and occasionally alleviate unwarranted trepidation. A clear understanding of the risks and benefits involved with various imaging tests in this patient population is vital to achieve this. This review discusses the different safety and appropriateness issues that could arise with the use of ionizing radiation, iodinated-, and gadolinium-based contrast media and radiopharmaceuticals in pregnant and lactating patients. Special considerations such as trauma imaging, safety concerns with magnetic resonance imaging and ultrasound, management of claustrophobia, contrast extravasation, and allergic reactions are also reviewed. The consent process for these examinations has also been described.
Collapse
Affiliation(s)
- Shobhit Mathur
- Department of Medical Imaging, St Michael's Hospital, University of Toronto, Ontario, Canada
| | | | - Saman Fouladirad
- Department of Radiology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Omar Metwally
- Department of Radiology, University of British Columbia, Vancouver, British Columbia, Canada
| | | | - Amy Wei Lin
- Department of Medical Imaging, St Michael's Hospital, University of Toronto, Ontario, Canada
| | - Aditya Bharatha
- Department of Medical Imaging, St Michael's Hospital, University of Toronto, Ontario, Canada
| | - Savvas Nicolaou
- Department of Radiology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Noah G Ditkofsky
- Department of Medical Imaging, St Michael's Hospital, University of Toronto, Ontario, Canada
| |
Collapse
|
7
|
|
8
|
Halpenny D, Park B, Alpert J, Latson L, Kim N, Babb J, Shiau M, Ko J. Low dose computed tomography pulmonary angiography protocol for imaging pregnant patients: Can dose reduction be achieved without reducing image quality? Clin Imaging 2017; 44:101-105. [PMID: 28500985 DOI: 10.1016/j.clinimag.2017.03.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 03/09/2017] [Accepted: 03/29/2017] [Indexed: 12/21/2022]
Abstract
OBJECTIVE To assess the effect of low dose computed tomography pulmonary angiography (CTPA) on radiation dose in pregnant patients. MATERIALS AND METHODS An old CTPA protocol for pregnant patients was compared to a new protocol. Protocol changes included: decreased kVp; increased contrast injection rate; imaging after shallow inspiration. Patients undergoing CTPA before (phase 1 group) or after (phase 2 group) the protocol change, were assessed. RESULTS Effective dose was lower in the phase 2 group (0.95 v 1.66 mSv; p<0.001). Quantitative noise was lower in the phase 1 group (p<0.001). CONCLUSION Low dose CTPA tailored for pregnancy reduces dose in pregnant patients.
Collapse
Affiliation(s)
- Darragh Halpenny
- Department of Thoracic Radiology, New York University School of Medicine, 660 1st Ave, NY 10016, USA.
| | - Brian Park
- New York University School of Medicine, 550 1st Avenue, New York, NY 10016, USA
| | - Jeffrey Alpert
- Department of Thoracic Radiology, New York University School of Medicine, 660 1st Ave, NY 10016, USA
| | - Larry Latson
- Department of Thoracic Radiology, New York University School of Medicine, 660 1st Ave, NY 10016, USA
| | - Nancy Kim
- New York University School of Medicine, 550 1st Avenue, New York, NY 10016, USA
| | - James Babb
- Department of Thoracic Radiology, New York University School of Medicine, 660 1st Ave, NY 10016, USA
| | - Maria Shiau
- Department of Thoracic Radiology, New York University School of Medicine, 660 1st Ave, NY 10016, USA
| | - Jane Ko
- Department of Thoracic Radiology, New York University School of Medicine, 660 1st Ave, NY 10016, USA
| |
Collapse
|
9
|
Tirada N, Dreizin D, Khati NJ, Akin EA, Zeman RK. Imaging Pregnant and Lactating Patients. Radiographics 2016; 35:1751-65. [PMID: 26466183 DOI: 10.1148/rg.2015150031] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
As use of imaging in the evaluation of pregnant and lactating patients continues to increase, misperceptions of radiation and safety risks have proliferated, which has led to often unwarranted concerns among patients and clinicians. When radiologic examinations are appropriately used, the benefits derived from the information gained usually outweigh the risks. This review describes appropriateness and safety issues, estimated doses for imaging examinations that use iodizing radiation (ie, radiography, computed tomography, nuclear scintigraphy, and fluoroscopically guided interventional radiology), radiation risks to the mother and conceptus during various stages of pregnancy, and use of iodinated or gadolinium-based contrast agents and radiotracers in pregnant and lactating women. Maternal radiation risk must be weighed with the potential consequences of missing a life-threatening diagnosis such as pulmonary embolus. Fetal risks (ie, spontaneous abortion, teratogenesis, or carcinogenesis) vary with gestational age and imaging modality and should be considered in the context of the potential benefit of medically necessary diagnostic imaging. When feasible and medically indicated, modalities that do not use ionizing radiation (eg, magnetic resonance imaging) are preferred in pregnant and lactating patients. Radiologists should strive to minimize risks of radiation to the mother and fetus, counsel patients effectively, and promote a realistic understanding of risks related to imaging during pregnancy and lactation.
Collapse
Affiliation(s)
- Nikki Tirada
- From the Department of Radiology, George Washington University Hospital, 900 23rd St NW, Washington, DC 20037 (N.T., N.J.K., E.A.A., R.K.Z.); and Department of Diagnostic Radiology, University of Maryland Medical Center and R Adams Cowley Shock Trauma Center, Baltimore, Md (D.D)
| | - David Dreizin
- From the Department of Radiology, George Washington University Hospital, 900 23rd St NW, Washington, DC 20037 (N.T., N.J.K., E.A.A., R.K.Z.); and Department of Diagnostic Radiology, University of Maryland Medical Center and R Adams Cowley Shock Trauma Center, Baltimore, Md (D.D)
| | - Nadia J Khati
- From the Department of Radiology, George Washington University Hospital, 900 23rd St NW, Washington, DC 20037 (N.T., N.J.K., E.A.A., R.K.Z.); and Department of Diagnostic Radiology, University of Maryland Medical Center and R Adams Cowley Shock Trauma Center, Baltimore, Md (D.D)
| | - Esma A Akin
- From the Department of Radiology, George Washington University Hospital, 900 23rd St NW, Washington, DC 20037 (N.T., N.J.K., E.A.A., R.K.Z.); and Department of Diagnostic Radiology, University of Maryland Medical Center and R Adams Cowley Shock Trauma Center, Baltimore, Md (D.D)
| | - Robert K Zeman
- From the Department of Radiology, George Washington University Hospital, 900 23rd St NW, Washington, DC 20037 (N.T., N.J.K., E.A.A., R.K.Z.); and Department of Diagnostic Radiology, University of Maryland Medical Center and R Adams Cowley Shock Trauma Center, Baltimore, Md (D.D)
| |
Collapse
|
10
|
Woitek R, Prayer D, Hojreh A, Helbich T. Radiological staging in pregnant patients with cancer. ESMO Open 2016; 1:e000017. [PMID: 27843585 PMCID: PMC5070210 DOI: 10.1136/esmoopen-2015-000017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 01/13/2016] [Indexed: 11/21/2022] Open
Affiliation(s)
- Ramona Woitek
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria.
| | - Daniela Prayer
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Azadeh Hojreh
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Thomas Helbich
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| |
Collapse
|
11
|
|
12
|
Abstract
Ongoing technical developments have substantially improved the potential of magnetic resonance imaging (MRI) in the assessment of the pulmonary circulation. These developments includes improved magnet and hardware design, new k-space sampling techniques (ie, parallel imaging), and alternative contrast materials. With these techniques, not only can pulmonary vessels be visualized by MR angiography with high spatial resolution but also the perfusion of the lungs and its changes in relation to pulmonary thromboembolism (PE) can be assessed. Considering venous thromboembolism as a systemic disease, MR venography might be added for the diagnosis of underlying deep venous thrombosis. A unique advantage of MRI over other imaging tests is its potential to evaluate changes in cardiac function as a result of obstruction of the pulmonary circulation, which may have a significant impact on patient monitoring and treatment. Finally, MRI does not involve radiation, which is advantageous, especially in young patients. Over the years, a number of studies have shown promising results not only for MR angiography but also for MRI of lung perfusion and for MR venography. This review article summarizes and discusses the current evidence on pulmonary MRI for patients with suspected PE.
Collapse
|
13
|
Conti E, Zezza L, Ralli E, Comito C, Sada L, Passerini J, Caserta D, Rubattu S, Autore C, Moscarini M, Volpe M. Pulmonary embolism in pregnancy. J Thromb Thrombolysis 2013; 37:251-70. [DOI: 10.1007/s11239-013-0941-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
14
|
Abstract
Approximately 1% to 4% of pregnant women are evaluated in emergency/delivery room because of traumatic injury, yet there are few educational strategies targeted toward prevention/management of maternal trauma. Use of illicit drugs and alcohol, domestic abuse, and depression contribute to maternal trauma; thus a high index of suspicion should be maintained when treating injured young women. Treating the mother appropriately is beneficial for both the mother and the fetus. Fetal viability should be assessed after maternal stabilization. Pregnancy-related morbidity occurs in approximately 25% of cases and may include placental abruption, uterine rupture, preterm delivery, and the need for cesarean delivery.
Collapse
Affiliation(s)
- Sharon Einav
- Hebrew University School of Medicine, Shaare Zedek Medical Centre, Jerusalem, Israel.
| | | | | |
Collapse
|
15
|
Cogley JR, Ghobrial PM, Chandrasekaran B, Allen SB. Pulmonary Embolism Evaluation in the Pregnant Patient: A Review of Current Imaging Approaches. Semin Ultrasound CT MR 2012; 33:11-7. [DOI: 10.1053/j.sult.2011.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
16
|
|
17
|
Fetal Radiation Dose During Gestation Estimated on an Anthropomorphic Phantom for Three Generations of CT Scanners. AJR Am J Roentgenol 2011; 196:1133-7. [DOI: 10.2214/ajr.10.4497] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
18
|
Niemann T, Nicolas G, Roser HW, Müller-Brand J, Bongartz G. Imaging for suspected pulmonary embolism in pregnancy-what about the fetal dose? A comprehensive review of the literature. Insights Imaging 2010; 1:361-372. [PMID: 22347929 PMCID: PMC3259315 DOI: 10.1007/s13244-010-0043-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Revised: 08/13/2010] [Accepted: 09/15/2010] [Indexed: 02/08/2023] Open
Abstract
OBJECTIVE: To give a comprehensive overview of fetal doses reported in the literature when imaging the pregnant woman with suspected pulmonary embolism (PE). METHODS: A comprehensive literature search in the PubMed, MEDLINE and EMBASE databases yielded a total of 1,687 papers that were included in the analysis and have been analysed with regard to fetal dose in suspected PE radiological imaging strategies. RESULTS: Fetal dose in chest computed tomography (CT) ranges between 0.013 and 0.026 mGy in early and 0.06-0.1 mGy in late pregnancy compared with 99mTc-MAA perfusion scintigraphy with a fetal dose of 0.1-0.6 mGy in early and 0.6-0.8 mGy in late pregnancy. (99m)Tc-aerosol ventilation scintigraphy results in 0.1-0.3 mGy. However, there is concern about female breast irradiation in CT, which is higher than in scintigraphy. CT radiation risks for breast tissue remain unclear. CONCLUSION: Knowledge of dosimetry and radiation risks is crucial in the radiological work-up of suspected PE in pregnancy. It is reasonable to reserve scintigraphy for pregnant patients with normal chest radiography findings and no history of asthma or chronic lung disease. Performing CT applying dose reduction instead of scintigraphy will minimise fetal radiation dose and maximise the diagnostic value.
Collapse
|
19
|
Hunsaker AR, Lu MT, Goldhaber SZ, Rybicki FJ. Imaging in acute pulmonary embolism with special clinical scenarios. Circ Cardiovasc Imaging 2010; 3:491-500. [PMID: 20647583 DOI: 10.1161/circimaging.109.855981] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Andetta R Hunsaker
- Applied Imaging Science Laboratory, the Thoracic Imaging Section, Department of Radiology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | | | | | | |
Collapse
|
20
|
Birnbaum S. Radiation Protection in the Era of Helical CT: Practical Patient Based Programs for Decreasing Patient Exposure. Semin Ultrasound CT MR 2010; 31:46-52. [DOI: 10.1053/j.sult.2009.09.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
21
|
Pahade JK, Litmanovich D, Pedrosa I, Romero J, Bankier AA, Boiselle PM. Imaging Pregnant Patients with Suspected Pulmonary Embolism: What the Radiologist Needs to Know. Radiographics 2009; 29:639-54. [DOI: 10.1148/rg.293085226] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
22
|
Patel SJ, Reede DL, Katz DS, Subramaniam R, Amorosa JK. Imaging the pregnant patient for nonobstetric conditions: algorithms and radiation dose considerations. Radiographics 2008; 27:1705-22. [PMID: 18025513 DOI: 10.1148/rg.276075002] [Citation(s) in RCA: 257] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Use of diagnostic imaging studies for evaluation of pregnant patients with medical conditions not related to pregnancy poses a persistent and recurring dilemma. Although a theoretical risk of carcinogenesis exists, there are no known risks for development of congenital malformations or mental retardation in a fetus exposed to ionizing radiation at the levels typically used for diagnostic imaging. An understanding of the effects of ionizing radiation on the fetus at different gestational stages and the estimated exposure dose received by the fetus from various imaging modalities facilitates appropriate choices for diagnostic imaging of pregnant patients with nonobstetric conditions. Other aspects of imaging besides radiation (ie, contrast agents) also carry potential for fetal injury and must be taken into consideration. Imaging algorithms based on a review of the current literature have been developed for specific nonobstetric conditions: pulmonary embolism, acute appendicitis, urolithiasis, biliary disease, and trauma. Imaging modalities that do not use ionizing radiation (ie, ultrasonography and magnetic resonance imaging) are preferred for pregnant patients. If ionizing radiation is used, one must adhere to the principle of using a dose that is as low as reasonably achievable after a discussion of risks versus benefits with the patient.
Collapse
Affiliation(s)
- Shital J Patel
- Department of Radiology, Long Island College Hospital, 339 Hicks St, Brooklyn, NY 11201, USA.
| | | | | | | | | |
Collapse
|
23
|
Fink C, Thieme S, Ley S, Clevert D, Reiser MF, Kauczor HU, Schoenberg SO. MRT der akuten Lungenembolie. Radiologe 2007; 47:708-15. [PMID: 17673970 DOI: 10.1007/s00117-007-1532-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Recent technical developments have substantially improved the potential of MRI for the diagnosis of pulmonary embolism. On the MR scanner side this includes the development of short magnets and dedicated whole-body MRI systems, which allow a comprehensive evaluation of pulmonary embolism and deep venous thrombosis in a single exam. The introduction of parallel imaging has substantially improved the spatial and temporal resolution of pulmonary MR angiography. By combining time-resolved pulmonary perfusion MRI with high-resolution pulmonary MRA a sensitivity and specificity of over 90% is achievable, which is comparable to the accuracy of CTA. Thus, for certain patient groups, such as patients with contraindications to iodinated contrast media and young women with a low clinical probability for pulmonary embolism, MRI can be considered as a first-line imaging tool for the assessment of pulmonary embolism.
Collapse
Affiliation(s)
- C Fink
- Institut für Klinische Radiologie, Universitätsklinikum Mannheim, Medizinische Fakultät Mannheim der Universität Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany.
| | | | | | | | | | | | | |
Collapse
|
24
|
Fink C, Ley S, Schoenberg SO, Reiser MF, Kauczor HU. Magnetic resonance imaging of acute pulmonary embolism. Eur Radiol 2007; 17:2546-53. [PMID: 17486344 DOI: 10.1007/s00330-007-0664-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Revised: 04/04/2007] [Accepted: 04/05/2007] [Indexed: 02/08/2023]
Abstract
Pulmonary embolism (PE) is a very common and potentially life-threatening disease. In comparison with CT, the clinical relevance of magnetic resonance imaging (MRI) for the assessment of PE is low. Nevertheless, as there are some potential advantages of MRI over CT (e.g. radiation free method, better safety profile of MR contrast media, capability of functional imaging). In certain patient, groups MRI might therefore be considered as a valuable alternative in the assessment of suspected PE. This article reviews the relevant MRI techniques for the evaluation of PE and gives an overview of the current literature for contrast-enhanced MR angiography of PE.
Collapse
Affiliation(s)
- Christian Fink
- Department of Clinical Radiology, University Hospital Mannheim, Medical Faculty Mannheim-University of Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany.
| | | | | | | | | |
Collapse
|