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Ota Y, Lee E, Sella E, Agarwal P. Vascular Malformations and Tumors: A Review of Classification and Imaging Features for Cardiothoracic Radiologists. Radiol Cardiothorac Imaging 2023; 5:e220328. [PMID: 37693195 PMCID: PMC10483253 DOI: 10.1148/ryct.220328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 05/02/2023] [Accepted: 05/17/2023] [Indexed: 09/12/2023]
Abstract
The International Society for the Study of Vascular Anomalies (ISSVA) classification is a comprehensive histology-based scheme that was updated in 2018. It is important for cardiothoracic imagers to understand this classification to ensure that accurate terminology is used and that archaic terms are avoided when vascular lesions are described. Knowledge of the various malformations (including common conditions, such as venous malformation, arteriovenous fistula, and arteriovenous malformation) and vascular tumors allows for timely diagnosis and appropriate management. This review describes various vascular anomalies, in accordance with ISSVA classification and terminology; highlights key imaging features associated with each; and discusses the role of different imaging modalities. Keywords: Pulmonary, Soft Tissues/Skin, Vascular, Arteriovenous Malformation © RSNA, 2023.
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Affiliation(s)
- Yoshiaki Ota
- From the Division of Cardiothoracic Radiology, Department of
Radiology, University of Michigan, 1500 E Medical Center Dr, Ann Arbor, MI
48109
| | - Elizabeth Lee
- From the Division of Cardiothoracic Radiology, Department of
Radiology, University of Michigan, 1500 E Medical Center Dr, Ann Arbor, MI
48109
| | - Edith Sella
- From the Division of Cardiothoracic Radiology, Department of
Radiology, University of Michigan, 1500 E Medical Center Dr, Ann Arbor, MI
48109
| | - Prachi Agarwal
- From the Division of Cardiothoracic Radiology, Department of
Radiology, University of Michigan, 1500 E Medical Center Dr, Ann Arbor, MI
48109
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Shnayien S, Beetz NL, Bressem KK, Hamm B, Niehues SM. Comparison of a High-Pitch Non-ECG-Gated and a Prospective ECG-Gated Protocol for Preprocedural Computed Tomography Imaging Before TAVI/TAVR. ROFO-FORTSCHR RONTG 2023; 195:139-147. [PMID: 36063835 DOI: 10.1055/a-1898-6504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
PURPOSE Preprocedural computed tomography (CT) imaging before transcatheter aortic valve implantation/replacement (TAVI/TAVR) requires high diagnostic accuracy without motion artifacts. The aim of this retrospective study is to compare the image quality of a high-pitch non-electrocardiography (ECG)-gated CT protocol used in patients with atrial tachyarrhythmias with a prospectively ECG-gated CT protocol used in patients with sinus rhythm. MATERIALS AND METHODS We retrospectively included 108 patients who underwent preprocedural CT imaging before TAVI/TAVR. 52 patients with sinus rhythm were imaged using a prospectively ECG-gated protocol (Group A), and 56 patients with atrial tachyarrhythmias were imaged using the high-pitch non-ECG-gated protocol (Group B). Image quality was rated subjectively by two experienced radiologists and assessed by objective parameters including radiation dose, image noise, contrast-to-noise ratio (CNR), and signal-to-noise ratio (SNR) at the levels of the aortic root and abdominal aorta. RESULTS Subjective image quality was equally good with both CT protocols, and interrater agreement was substantial in both groups but tended to be higher in Group B at the level of the aortic root (Group A: κw = 0.644, Group B: κw = 0.741). With the high-pitch non-ECG-gated CT protocol, image noise was significantly increased (p = 0.001), whereas the SNR, CNR, and radiation dose were significantly decreased (p = 0.002, p = 0.003, and p < 0.001, respectively) at the level of the aortic root compared to the prospectively ECG-gated CT protocol. CONCLUSION The high-pitch non-ECG-gated protocol yields images with similar subjective image quality compared with the prospectively ECG-gated CT protocol and allows motion-free assessment of the aortic root for accurate TAVI/TAVR planning. The high-pitch non-ECG-gated protocol may be used as an alternative for preprocedural CT imaging in patients with atrial tachyarrhythmias. KEY POINTS · In patients with atrial tachyarrhythmias, a high-pitch non-ECG-gated CT protocol achieves similar subjective image quality compared to a prospective ECG-gated CT protocol.. · At the level of the aortic root, image noise is significantly increased, whereas SNR and CNR are significantly decreased using the high-pitch non-ECG-gated protocol.. · Radiation dose is reduced by 55 % using the high-pitch non-ECG-gated protocol.. CITATION FORMAT · Shnayien S, Beetz N, Bressem KK et al. Comparison of a High-Pitch Non-ECG-Gated and a Prospective ECG-Gated Protocol for Preprocedural Computed Tomography Imaging Before TAVI/TAVR. Fortschr Röntgenstr 2023; 195: 139 - 147.
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Affiliation(s)
- Seyd Shnayien
- Department of Radiology, Charite University Hospital Berlin, Germany
| | - Nick Lasse Beetz
- Department of Radiology, Charite University Hospital Berlin, Germany.,Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Berlin, Germany
| | | | - Bernd Hamm
- Department of Radiology, Charite University Hospital Berlin, Germany
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Maruyama M, Yoshizako T, Ando S, Nakamura M, Tajima Y, Kitagaki H. Coil volume embolization ratio for preventing recanalization after portal vein embolization. ACTA ACUST UNITED AC 2021; 27:366-371. [PMID: 34003123 DOI: 10.5152/dir.2021.20043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
PURPOSE The purpose of this study was to evaluate the optimum volume embolization ratio (VER) for the prevention of recanalization after portal vein embolization (PVE) and the influence of recanalization on future liver remnant (FLR) function using technetium-99m galactosyl human serum albumin single-photon emission computed tomography (99mTc-GSA SPECT/CT) fusion imaging. METHODS We analyzed procedural data of 18 patients who underwent PVE from 2015 to 2018. A total of 29 portal branches were embolized (12 anterior branch, 11 posterior branch, 4 left branch, 2 right branch) with absolute ethanol and coils. Portal vein recanalization was evaluated three weeks after PVE by contrast-enhanced CT. We classified the treated portal branches as non-recanalized and recanalized. VER was compared between the groups. In addition, for each patient, we calculated and evaluated the ratio of FLR volume to total liver volume (volumetric %FLR), FLR count to total liver count on 99mTc-GSA SPECT/CT fusion imaging (functional %FLR), and functional-volumetric ratio (functional %FLR/ volumetric %FLR). RESULTS Twenty-six portal branches showed no recanalization (non-recanalized group, n=26, 89.7%), while three portal branches showed recanalization (recanalized group, n=3, 10.3%). The median VER was 4.94% (3.12%-11.1%) in the non-recanalized group and 3.49% (2.76%-4.32%) in the recanalized group, which was significantly different between the groups (p = 0.045, Mann-Whitney U test). The median functional-volumetric ratio was 1.16 (1.03-1.50) in non-recanalized patients (n=15, 83.3%) and 1.01 (0.96-1.13) in recanalized patients (n=3, 16.7%), and it was significantly higher in the non-recanalized patients (p = 0.021, Mann-Whitney U test). CONCLUSION The VER for preventing recanalization after PVE was approximately 5% (> 4.94%). 99mTc-GSA SPECT/CT fusion imaging revealed a decrease in FLR function due to recanalization after PVE.
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Affiliation(s)
- Mitsunari Maruyama
- Department of Radiology, Shimane University Faculty of Medicine, Enya cho Izumo, Japan
| | - Takeshi Yoshizako
- Department of Radiology, Shimane University Faculty of Medicine, Enya cho Izumo, Japan
| | - Shinji Ando
- Department of Radiology, Shimane University Faculty of Medicine, Enya cho Izumo, Japan
| | - Megumi Nakamura
- Department of Radiology, Shimane University Faculty of Medicine, Enya cho Izumo, Japan
| | - Yoshitsugu Tajima
- Department of Hepato-Biliary-Pancreatic Surgery, Shimane University Faculty of Medicine, Enya cho, Izumo, Japan
| | - Hajime Kitagaki
- Department of Radiology, Shimane University Faculty of Medicine, Enya cho Izumo, Japan
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Shnayien S, Bressem KK, Beetz NL, Asbach P, Hamm B, Niehues SM. Radiation Dose Reduction in Preprocedural CT Imaging for TAVI/TAVR Using a Novel 3-Phase Protocol: A Single Institution's Experience. ROFO-FORTSCHR RONTG 2020; 192:1174-1182. [PMID: 32299112 DOI: 10.1055/a-1150-7646] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PURPOSE To retrospectively investigate the effectiveness of a novel 3-phase protocol for computed tomography (CT) before transcatheter aortic valve implantation/transcatheter aortic valve replacement (TAVI/TAVR) in terms of radiation dose and image quality. MATERIALS AND METHODS A total of 107 nonrandomized patients (81 ± 7.4 years) scheduled for TAVI/TAVR underwent preprocedural CT on an 80-row CT scanner. 55 patients underwent a combined ECG-synchronized spiral scan of the chest and non-ECG-synchronized spiral scan of the abdomen/pelvis as recommended by the Society of Cardiovascular Computed Tomography (SCCT). 52 patients underwent an updated 3-phase variable helical pitch (vHP3) protocol combining a non-ECG-synchronized spiral scan of the upper thoracic aperture, followed by a prospective ECG-synchronized spiral scan of the heart, and a non-ECG-synchronized abdominal/pelvic spiral scan. The radiation dose was determined from an automatically generated protocol based on the CT dose index (CTDI). Objective image quality in terms of vessel attenuation and image noise was measured, and the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated. Subjective image quality was evaluated using a 4-point scale and compared for interrater agreement using Cohen's weighted kappa coefficient (κw). All data were compared and statistically analyzed. RESULTS Use of the novel 3-phase vHP3 protocol reduced the dose-length product (DLP) from 1256.58 ± 619.05 mGy*cm to 790.90 ± 238.15 mGy*cm, reducing the effective dose (E) from 21.36 ± 10.52 mSv to 13.44 ± 4.05 mSv and size-specific dose estimates (SSDE) from 20.85 ± 7.29 mGy to 13.84 ± 2.94 mGy (p < 0.001). There were no significant differences in objective and subjective image quality between the two protocols and between the two readers. CONCLUSION The novel 3-phase vHP3 protocol significantly reduces the radiation dose of preprocedural TAVI/TAVR CT without a loss of image quality. KEY POINTS · The use of a novel 3-phase protocol for preprocedural TAVI/TAVR CT reduces radiation dose by 37 % compared to a combined ECG-synchronized and non-ECG-synchronized spiral CT protocol.. · Objective image quality remains unaffected as image noise, SNR, and CNR did not differ significantly between the two protocols. The average attenuation of the aortic root and abdominal aorta exceeded 450 HU in both protocols.. · The average subjective image quality ratings were good to excellent for both protocols with almost perfect to substantial interrater agreement.. CITATION FORMAT · Shnayien S, Bressem KK, Beetz NL et al. Radiation Dose Reduction in Preprocedural CT Imaging for TAVI/TAVR Using a Novel 3-Phase Protocol: A Single Institution's Experience. Fortschr Röntgenstr 2020; 192: 1174 - 1182.
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Affiliation(s)
- Seyd Shnayien
- Radiology, Charité-Universitätsmedizin Berlin, Germany
| | | | | | | | - Bernd Hamm
- Radiology, Charité-Universitätsmedizin Berlin, Germany
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Embolization using hydrogel-coated coils for pulmonary arteriovenous malformations. Diagn Interv Imaging 2020; 101:129-135. [DOI: 10.1016/j.diii.2019.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 10/14/2019] [Accepted: 10/22/2019] [Indexed: 11/19/2022]
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Chou R, Chi HY, Lin YH, Ying LK, Chao YJ, Lin CH. Comparison of quantitative measurements of four manufacturer's metal artifact reduction techniques for CT imaging with a self-made acrylic phantom. Technol Health Care 2020; 28:273-287. [PMID: 32364160 PMCID: PMC7369061 DOI: 10.3233/thc-209028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Metal artifact reduction (MAR) techniques can improve metal artifacts of computed tomography (CT) images. OBJECTIVE This work focused on conducting a quantitative analysis to compare the effectiveness of four commercial MAR techniques on three types of metal implants (hip implant, spinal implant, and dental filling) with a self-made acrylic phantom. METHODS A cylindrical phantom was made from acrylic with a groove in the middle, and then three types of metal implants were placed in the groove. The phantom was scanned by four CT scanners and four commercialized MAR techniques were used to analyze the images. The techniques used were single-energy metal artifact reduction (SEMAR, Canon), smart metal artifact reduction software (Smart-MAR, GE), iterative metal artifact reduction (IMAR, Siemens), and metal artifact reduction for orthopedic implants (OMAR, Philips). Quantitative analysis methods included objective and subjective analysis. RESULTS The expected value of SEMAR, Smart-MAR, IMAR, and OMAR were 36.6, 37.8, 5.0, and 2.3, respectively. SEMAR and Smart-MAR achieved optimal results. CONCLUSION This study successfully evaluated the effects of four commercial MAR techniques on three types of metal implants in a phantom. All MAR techniques effectively reduced metal artifacts, but the effect was not significant with dental fillings due to high-density material.
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Affiliation(s)
- Ryan Chou
- Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan
| | - Hung-Yi Chi
- Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Yi-Hung Lin
- Department of Radiology, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Liu-Kuo Ying
- Department of Radiology, E-DA Cancer Hospital, Kaohsiung, Taiwan
| | - Yu-Ju Chao
- Department of Medical Imaging, Cheng Hsin General Hospital, Taipei, Taiwan
| | - Cheng-Hsun Lin
- Department of Medical Imaging and Radiological Sciences, Central Taiwan University of Science and Technology, Taichung, Taiwan
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Niehues SM, Vahldiek JL, Tröltzsch D, Hamm B, Shnayien S. Impact of Single-Energy Metal Artifact Reduction on CT image quality in patients with dental hardware. Comput Biol Med 2018; 103:161-166. [DOI: 10.1016/j.compbiomed.2018.10.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/24/2018] [Accepted: 10/18/2018] [Indexed: 10/28/2022]
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Duarte Conde MP, de Korte AM, Meijer FJA, Aquarius R, Boogaarts HD, Bartels RHMA, de Vries J. Subtraction CTA: An Alternative Imaging Option for the Follow-Up of Flow-Diverter-Treated Aneurysms? AJNR Am J Neuroradiol 2018; 39:2051-2056. [PMID: 30287460 DOI: 10.3174/ajnr.a5817] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Accepted: 08/09/2018] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE This was a pilot study to explore the diagnostic accuracy and safety of subtraction CTA combined with a single-energy metal artifact reduction algorithm (SEMAR) compared to DSA for the evaluation of intracranial aneurysm occlusion after flow diverter treatment. MATERIALS AND METHODS We included patients treated with a flow diverter for an unruptured intracranial aneurysm between November 2015 and November 2016. The patient cohort comprised 2 groups: those who underwent follow-up imaging 1 month after flow-diverter treatment and those with a known residual intracranial aneurysm after flow diverter treatment who underwent imaging at regular follow-ups. Full-brain subtraction CTA was performed on a 320-detector row CT system. A low-dose non-enhanced volume acquisition was followed by a contrast-enhanced volume CTA. Iterative and noise-reduction filters, SEMAR, and SURESubtraction algorithms were applied. DSA was performed on a flat panel C-arm angiography system. Standard posteroanterior, lateral, 3D, and detailed 2D acquisitions were performed. Imaging was independently scored by 2 clinicians. Aneurysm occlusion (Raymond scale) was our primary outcome parameter. RESULTS Thirteen intracranial aneurysms were evaluated with subtraction CTA and DSA. Nine aneurysm remnants were demonstrated by both subtraction CTA and DSA. The sensitivity and specificity of subtraction CTA for the detection of aneurysm occlusion were 100% (95% CI, 82.41%-100%) and 100% (95% CI, 67.55%-100%), respectively. Agreement between readers was perfect (κ = 1.0). The smallest neck remnant detected on subtraction CTA was 1.2 mm. No complications occurred. CONCLUSIONS Subtraction CTA with single-electron metal artifact reduction is effective in the reduction of metal artifacts of flow diverters and might therefore be a viable alternative in the assessment of intracranial aneurysm occlusion after flow diverter treatment.
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Affiliation(s)
- M P Duarte Conde
- From the Departments of Neurosurgery (M.P.D.C., A.M.d.K., R.A., H.D.B., R.H.M.A.B., J.d.V.)
| | - A M de Korte
- From the Departments of Neurosurgery (M.P.D.C., A.M.d.K., R.A., H.D.B., R.H.M.A.B., J.d.V.)
| | | | - R Aquarius
- From the Departments of Neurosurgery (M.P.D.C., A.M.d.K., R.A., H.D.B., R.H.M.A.B., J.d.V.).,Pathology (R.A.), Radboud University Medical Center, Nijmegen, the Netherlands
| | - H D Boogaarts
- From the Departments of Neurosurgery (M.P.D.C., A.M.d.K., R.A., H.D.B., R.H.M.A.B., J.d.V.)
| | - R H M A Bartels
- From the Departments of Neurosurgery (M.P.D.C., A.M.d.K., R.A., H.D.B., R.H.M.A.B., J.d.V.)
| | - J de Vries
- From the Departments of Neurosurgery (M.P.D.C., A.M.d.K., R.A., H.D.B., R.H.M.A.B., J.d.V.)
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