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Wu Z, Han Q, Liang Y, Zheng Z, Wu M, Ai Z, Ma K, Xiang Z. Enhancing diagnostic performance and image quality in coronary CT angiography: Impact of SnapShot Freeze 2 algorithm across varied heart rates in stent patients. J Appl Clin Med Phys 2024; 25:e14412. [PMID: 38807292 PMCID: PMC11302822 DOI: 10.1002/acm2.14412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 05/10/2024] [Accepted: 05/13/2024] [Indexed: 05/30/2024] Open
Abstract
PURPOSE To investigate the enhancement of image quality achieved through the utilization of SnapShot Freeze 2 (SSF2), a comparison was made against the results obtained from the original SnapShot Freeze algorithm (SSF) and standard motion correction (STND) in stent patients undergoing coronary CT angiography (CCTA) across the entire range of heart rates. MATERIALS AND METHODS A total of 118 patients who underwent CCTA, were retrospectively included in this study. Images of these patients were reconstructed using three different algorithms: SSF2, SSF, and STND. Objective assessments include signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), diameters of stents and artifact index (AI). The image quality was subjectively evaluated by two readers. RESULTS Compared with SSF and STND, SSF2 had similar or even higher quality in the parameters (AI, SNR, CNR, inner diameters) of coronary artery, stent, myocardium, MV (mitral valve), TV (tricuspid valve), AV (aorta valve), and PV (pulmonary valve), and aortic root (AO). Besides the above structures, SSF2 also demonstrated comparable or even higher subjective scores in atrial septum (AS), ventricular septum (VS), and pulmonary artery root (PA). Furthermore, the enhancement in image quality with SSF2 was significantly greater in the high heart rate group compared to the low heart rate group. Moreover, the improvement in both high and low heart rate groups was better in the SSF2 group compared to the SSF and STND group. Besides, when using the three algorithms, an effect of heart rate variability on stent image quality was not detected. CONCLUSION Compared to SSF and STND, SSF2 can enhance the image quality of whole-heart structures and mitigate artifacts of coronary stents. Furthermore, SSF2 has demonstrated a significant improvement in the image quality for patients with a heart rate equal to or higher than 85 bpm.
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Affiliation(s)
- Zhehao Wu
- Postgraduate Cultivation Base of Guangzhou University of Chinese Medicine, Panyu Central HospitalGuangzhouChina
- Department of RadiologyGuangzhou Panyu Central HospitalGuangzhouChina
| | - Qijia Han
- Department of RadiologyGuangzhou Panyu Central HospitalGuangzhouChina
| | - Yuying Liang
- Department of RadiologyGuangzhou Panyu Central HospitalGuangzhouChina
| | - Zhijuan Zheng
- Postgraduate Cultivation Base of Guangzhou University of Chinese Medicine, Panyu Central HospitalGuangzhouChina
- Department of RadiologyGuangzhou Panyu Central HospitalGuangzhouChina
| | - Minyi Wu
- Department of RadiologyGuangzhou Panyu Central HospitalGuangzhouChina
| | - Zhu Ai
- Department of RadiologyGuangzhou Panyu Central HospitalGuangzhouChina
| | - Kun Ma
- CT Imaging Research CenterGE HealthCare ChinaGuangzhouChina
| | - Zhiming Xiang
- Department of RadiologyGuangzhou Panyu Central HospitalGuangzhouChina
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Ghafari C, Carlier S. Stent visualization methods to guide percutaneous coronary interventions and assess long-term patency. World J Cardiol 2021; 13:416-437. [PMID: 34621487 PMCID: PMC8462039 DOI: 10.4330/wjc.v13.i9.416] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 05/24/2021] [Accepted: 07/22/2021] [Indexed: 02/06/2023] Open
Abstract
Evaluation of acute percutaneous coronary intervention (PCI) results and long-term follow-up remains challenging with ongoing stent designs. Several imaging tools have been developed to assess native vessel atherosclerosis and stent expansion, improving overall PCI results and reducing adverse cardiac events. Quantitative coronary analysis has played a crucial role in quantifying the extent of coronary artery disease and stent results. Digital stent enhancement methods have been well validated and improved stent strut visualization. Intravascular imaging remains the gold standard in PCI guidance but adds costs and time to the procedure. With a recent shift towards non-invasive imaging assessment and coronary computed tomography angiography imaging have shown promising results. We hereby review novel stent visualization techniques used to guide PCI and assess stent patency in the modern PCI era.
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Affiliation(s)
| | - Stéphane Carlier
- Department of Cardiology, UMONS, Mons 7000, Belgium
- Department of Cardiology, CHU Ambroise Paré, Mons 7000, Belgium
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Health Care Monitoring and Treatment for Coronary Artery Diseases: Challenges and Issues. SENSORS 2020; 20:s20154303. [PMID: 32752231 PMCID: PMC7435700 DOI: 10.3390/s20154303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/09/2020] [Accepted: 07/12/2020] [Indexed: 01/03/2023]
Abstract
In-stent restenosis concerning the coronary artery refers to the blood clotting-caused re-narrowing of the blocked section of the artery, which is opened using a stent. The failure rate for stents is in the range of 10% to 15%, where they do not remain open, thereby leading to about 40% of the patients with stent implantations requiring repeat procedure within one year, despite increased risk factors and the administration of expensive medicines. Hence, today stent restenosis is a significant cause of deaths globally. Monitoring and treatment matter a lot when it comes to early diagnosis and treatment. A review of the present stent monitoring technology as well as the practical treatment for addressing stent restenosis was conducted. The problems and challenges associated with current stent monitoring technology were illustrated, along with its typical applications. Brief suggestions were given and the progress of stent implants was discussed. It was revealed that prime requisites are needed to achieve good quality implanted stent devices in terms of their size, reliability, etc. This review would positively prompt researchers to augment their efforts towards the expansion of healthcare systems. Lastly, the challenges and concerns associated with nurturing a healthcare system were deliberated with meaningful evaluations.
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Canan A, Ranganath P, Goerne H, Abbara S, Landeras L, Rajiah P. CAD-RADS: Pushing the Limits. Radiographics 2020; 40:629-652. [PMID: 32281902 DOI: 10.1148/rg.2020190164] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Coronary CT angiography is now established as the first-line diagnostic imaging test to exclude coronary artery disease (CAD) in the population at low to intermediate risk. Wide variability exists in both the reporting of coronary CT angiography and the interpretation of these reports by referring physicians. The CAD Reporting and Data System (CAD-RADS) is sponsored by multiple societies and is a collaborative effort to provide standard classification of CAD, which is then integrated into patient clinical care. The main goals of the CAD-RADS are to decrease variability among readers; enhance communication between interpreting and referring clinicians, allowing collaborative determination of the best course of patient care; and generate consistent data for auditing, data mining, quality improvement, research, and education. There are several scenarios in which the CAD-RADS guidelines are ambiguous or do not provide definite recommendations for further management of CAD. The authors discuss the CAD-RADS categories and modifiers, highlight a variety of complex or ambiguous scenarios, and provide recommendations for managing these scenarios. Online supplemental material is available for this article. ©RSNA, 2020 See discussion on this article by Aviram and Wolak.
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Affiliation(s)
- Arzu Canan
- From the Department of Radiology, Division of Cardiothoracic Imaging, UT Southwestern Medical Center, Dallas, Tex (A.C., P. Ranganath, H.G., S.A., P. Rajiah); Imaging and Diagnosis Center, Guadalajara, Mexico (H.G.); and Department of Radiology, University of Chicago Medical Center, Chicago, Ill (L.L.)
| | - Praveen Ranganath
- From the Department of Radiology, Division of Cardiothoracic Imaging, UT Southwestern Medical Center, Dallas, Tex (A.C., P. Ranganath, H.G., S.A., P. Rajiah); Imaging and Diagnosis Center, Guadalajara, Mexico (H.G.); and Department of Radiology, University of Chicago Medical Center, Chicago, Ill (L.L.)
| | - Harold Goerne
- From the Department of Radiology, Division of Cardiothoracic Imaging, UT Southwestern Medical Center, Dallas, Tex (A.C., P. Ranganath, H.G., S.A., P. Rajiah); Imaging and Diagnosis Center, Guadalajara, Mexico (H.G.); and Department of Radiology, University of Chicago Medical Center, Chicago, Ill (L.L.)
| | - Suhny Abbara
- From the Department of Radiology, Division of Cardiothoracic Imaging, UT Southwestern Medical Center, Dallas, Tex (A.C., P. Ranganath, H.G., S.A., P. Rajiah); Imaging and Diagnosis Center, Guadalajara, Mexico (H.G.); and Department of Radiology, University of Chicago Medical Center, Chicago, Ill (L.L.)
| | - Luis Landeras
- From the Department of Radiology, Division of Cardiothoracic Imaging, UT Southwestern Medical Center, Dallas, Tex (A.C., P. Ranganath, H.G., S.A., P. Rajiah); Imaging and Diagnosis Center, Guadalajara, Mexico (H.G.); and Department of Radiology, University of Chicago Medical Center, Chicago, Ill (L.L.)
| | - Prabhakar Rajiah
- From the Department of Radiology, Division of Cardiothoracic Imaging, UT Southwestern Medical Center, Dallas, Tex (A.C., P. Ranganath, H.G., S.A., P. Rajiah); Imaging and Diagnosis Center, Guadalajara, Mexico (H.G.); and Department of Radiology, University of Chicago Medical Center, Chicago, Ill (L.L.)
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Dai T, Wang JR, Hu PF. Diagnostic performance of computed tomography angiography in the detection of coronary artery in-stent restenosis: evidence from an updated meta-analysis. Eur Radiol 2017; 28:1373-1382. [DOI: 10.1007/s00330-017-5097-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 09/10/2017] [Accepted: 09/25/2017] [Indexed: 11/29/2022]
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Coronary in-stent restenosis: predisposing clinical and stent-related factors, diagnostic performance and analyses of inaccuracies in 320-row computed tomography angiography. Int J Cardiovasc Imaging 2016; 32 Suppl 1:105-15. [DOI: 10.1007/s10554-016-0872-6] [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: 03/02/2016] [Accepted: 03/07/2016] [Indexed: 10/21/2022]
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Yue J, Chen J, Dou W, Hu Y, Li Q, Zhou F, Cui H, Wu Q, Yang R. Comparative analysis between 64- and 320-slice spiral computed tomography in the display of coronary artery stents and diagnosis of in-stent restenosis. Exp Ther Med 2015; 10:1871-1876. [PMID: 26640564 DOI: 10.3892/etm.2015.2768] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 08/26/2015] [Indexed: 01/17/2023] Open
Abstract
The aim of the present study was to compare the accuracy of 64-multi-slice spiral computed tomography (64-MSCT) and 320-MSCT in the display of coronary artery stents and diagnosis of in-stent restenosis. The data collected from the 64- and 320-MSCT coronary angiography of 93 patients following coronary artery stent implantation were retrospectively analyzed. The 64-MSCT group comprised 30 cases with 57 stents and the 320-MSCT group comprised 63 cases with 93 stents. The image quality, heart rate of the patients and the radiation effective dose (ED) they were subjected to, were compared. Furthermore, the diagnostic abilities of 64-and 320-MSCT coronary angiography for in-stent restenosis were evaluated using invasive coronary angiography results as the gold standards. Statistically significant differences were observed in the heart rate and ED of the patients from the two groups (P<0.05), but no significant difference was identified in the accuracy index (P>0.05). The sensitivity, specificity, positive and negative predictive value and accuracy of the 64-MSCT group were found to be 100% (7/7), 93.94% (31/33), 77.78% (7/9), 100% (31/31) and 95% (38/40), respectively, and those in the 320-MSCT group were found to be 100% (16/16), 95.89% (70/73), 84.21% (16/19), 100% (70/70) and 96.63% (86/89), respectively. The present findings suggest that both 64-MSCT and 320-MSCT can be used for follow-up and curative effect evaluation following coronary stent implantation; however, 320-MSCT has fewer requirements of the patients' heart rate and uses a lower radiation dose.
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Affiliation(s)
- Junyan Yue
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| | - Jie Chen
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| | - Wenguang Dou
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| | - Ying Hu
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| | - Qiang Li
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| | - Fengmei Zhou
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| | - Hongkai Cui
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| | - Qingwu Wu
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
| | - Ruimin Yang
- Imaging Center, The First Affiliated Hospital of Xinxiang Medical University, Weihui, Henan 453100, P.R. China
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Wang LF, Tao LW, Huang MX, Liao WB, Zhu YZ, Zhou WB, Li H, Li D, Lu HT, Zhang BZ, Chen Z. Clinical Evaluation of Coronary In-Stent Restenosis Using Dual-Source Computed Tomography. Echocardiography 2015; 32:1681-7. [PMID: 25816917 DOI: 10.1111/echo.12932] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Lian-Fa Wang
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - Li-Wei Tao
- Department of Cardiothoracic Surgery; The Second People's Hospital of Fuyang City; Fuyang Anhui China
| | - Meng-Xun Huang
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - Wen-Bin Liao
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - You-Zhi Zhu
- Department of Radiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - Wen-Bing Zhou
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - Hua Li
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - Dan Li
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - Hong-Tao Lu
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - Bang-Zhu Zhang
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
| | - Zhen Chen
- Department of Cardiology; People's Liberation Army No. 105 Hospital; Hefei Anhui China
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Yoshimura M, Nao T, Miura T, Okada M, Nakashima Y, Fujimura T, Okamura T, Yamada J, Matsunaga N, Matsuzaki M, Yano M. New quantitative method to diagnose coronary in-stent restenosis by 64-multislice computed tomography. J Cardiol 2015; 65:57-62. [DOI: 10.1016/j.jjcc.2014.03.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 02/12/2014] [Accepted: 03/14/2014] [Indexed: 10/25/2022]
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Cardiac CT and Stent Imaging: Update 2014. CURRENT CARDIOVASCULAR IMAGING REPORTS 2014. [DOI: 10.1007/s12410-014-9275-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Zheng XZ, Yang B, Wu J. Sex-specific assessment of reduced coronary sinus flow in non-hypertensive patients with coronary artery disease at rest. Libyan J Med 2013; 8:21553. [PMID: 23863220 PMCID: PMC3714674 DOI: 10.3402/ljm.v8i0.21553] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2013] [Accepted: 06/26/2013] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Access to data on the coronary flow in the coronary sinus (CS) can aid in the diagnosis of coronary artery disease (CAD). We tested the hypothesis that assessing the CS flow by transthoracic Doppler echocardiography (TTE) at rest can detect coronary artery stenosis in non-hypertensive patients. METHODS The antegrade phase of coronary flow in the CS was analyzed and compared in 140 male and 135 female non-hypertensive subjects who had all undergone coronary angiography. RESULTS There were statistically significant differences noted between males and females for the CS flow both in normal subjects and patients with CAD. Compared with normal subjects, patients with CAD had significantly lower blood flow in the CS both in males (196.6±174.31 vs. 367.65±168.04 ml/min, P<0.01) and females (183.04±65.46 vs. 244.13±135.43 ml/min P<0.01). For males, the diagnostic sensitivity, specificity, and accuracy of the cutoff value of the CS flow (206 ml/min) for predicting a significant coronary artery stenosis (>70%) were 91.67%, 81.25%, and 85.71%, respectively. For females, those of the cutoff value of the CS flow (195 ml/min) were 85.71%, 75%, and 80%, respectively. CONCLUSION TTE can effectively detect coronary hemodynamically significant stenosis in non-hypertensive male and female patients at different cutoff values.
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Affiliation(s)
- Xiao-Zhi Zheng
- Department of Ultrasound, Jinling Hospital, Nanjing University School of Medicine, Nanjing City, Jiangsu Province, People's Republic of China
- Department of Ultrasound, The Fourth Affiliated Hospital of Nantong University, The First People's Hospital of Yancheng, Jiangsu Province, People's Republic of China
| | - Bin Yang
- Department of Ultrasound, Jinling Hospital, Nanjing University School of Medicine, Nanjing City, Jiangsu Province, People's Republic of China
| | - Jing Wu
- Department of Ultrasound, The Fourth Affiliated Hospital of Nantong University, The First People's Hospital of Yancheng, Jiangsu Province, People's Republic of China
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Evaluation of coronary artery stent patency by using 64-slice multi-detector computed tomography and conventional coronary angiography: A comparison with intravascular ultrasonography. Int J Cardiol 2013; 166:90-5. [DOI: 10.1016/j.ijcard.2011.10.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2011] [Revised: 09/19/2011] [Accepted: 10/09/2011] [Indexed: 11/21/2022]
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Mahnken AH. CT Imaging of Coronary Stents: Past, Present, and Future. ISRN CARDIOLOGY 2012; 2012:139823. [PMID: 22997590 PMCID: PMC3446716 DOI: 10.5402/2012/139823] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 08/16/2012] [Indexed: 11/23/2022]
Abstract
Coronary stenting became a mainstay in coronary revascularization therapy. Despite tremendous advances in therapy, in-stent restenosis (ISR) remains a key problem after coronary stenting. Coronary CT angiography evolved as a valuable tool in the diagnostic workup of patients after coronary revascularization therapy. It has a negative predictive value in the range of 98% for ruling out significant ISR. As CT imaging of coronary stents depends on patient and stent characteristics, patient selection is crucial for success. Ideal candidates have stents with a diameter of 3 mm and more. Nevertheless, even with most recent CT scanners, about 8% of stents are not accessible mostly due to blooming or motion artifacts. While the diagnosis of ISR is currently based on the visual assessment of the stent lumen, functional information on the hemodynamic significance of in-stent stenosis became available with the most recent generation of dual source CT scanners. This paper provides a comprehensive overview on previous developments, current techniques, and clinical evidence for cardiac CT in patients with coronary artery stents.
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Affiliation(s)
- Andreas H Mahnken
- Department of Diagnostic and Interventional Radiology, University Hospital, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany
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Imaging of Coronary Stents by Coronary CT-Angiography: Current Status. CURRENT CARDIOVASCULAR IMAGING REPORTS 2012. [DOI: 10.1007/s12410-012-9155-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Indications, imaging technique, and reading of cardiac computed tomography: survey of clinical practice. Eur Radiol 2011; 22:59-72. [PMID: 21845461 DOI: 10.1007/s00330-011-2239-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Revised: 06/09/2011] [Accepted: 07/01/2011] [Indexed: 10/17/2022]
Abstract
OBJECTIVES To obtain an overview of the current clinical practice of cardiac computed tomography (CT). METHODS A 32-item questionnaire was mailed to a total of 750 providers of cardiac CT in 57 countries. RESULTS A total of 169 questionnaires from 38 countries were available for analysis (23%). Most CT systems used (94%, 207/221) were of the latest generation (64-row or dual-source CT). The most common indications for cardiac CT was exclusion of coronary artery disease (97%, 164/169). Most centres used beta blockade (91%, 151/166) and sublingual nitroglycerine (80%, 134/168). A median slice thickness of 0.625 mm with a 0.5-mm increment and an 18-cm reconstruction field of view was used. Interpretation was most often done using source images in orthogonal planes (92%, 155/169). Ninety percent of sites routinely evaluate extracardiac structures on a large (70%) or cardiac field of view (20%). Radiology sites were significantly more interested in jointly performing cardiac CT together with cardiology than cardiologists. The mean examination time was 18.6 ± 8.4 min, and reading took on average 28.7 ± 17.8 min. CONCLUSIONS Cardiac CT has rapidly become established in clinical practice, and there is emerging consensus regarding indications, conduct of the acquisition, and reading.
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