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Tytuł:
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Radiation dose for 320-row dose-modulated dynamic coronary CT angiography.
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Autorzy:
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Izoe Y; Graduate School of Medicine, Health Sciences, Division of Radiological Examination and Technology, Tohoku University, Sendai City, Japan.
Nagao M; Department of Diagnostic imaging & Nuclear Medicine, Tokyo Women's Medical University, Tokyo, Japan.
Tokai M; Department of Radiological Service, Tokyo Women's Medical University, Tokyo, Japan.
Hashimoto H; Department of Radiological Service, Tokyo Women's Medical University, Tokyo, Japan.
Tanaka I; Department of Radiological Service, Tokyo Women's Medical University, Tokyo, Japan.
Chida K; Graduate School of Medicine, Health Sciences, Division of Radiological Examination and Technology, Tohoku University, Sendai City, Japan.
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Źródło:
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Journal of applied clinical medical physics [J Appl Clin Med Phys] 2021 Sep; Vol. 22 (9), pp. 307-312. Date of Electronic Publication: 2021 Aug 10.
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Typ publikacji:
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Journal Article; Randomized Controlled Trial
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Język:
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English
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Imprint Name(s):
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Publication: 2017- : Malden, MA : Wiley on behalf of American Association of Physicists in Medicine
Original Publication: Reston, VA : American College of Medical Physics, c2000-
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MeSH Terms:
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Computed Tomography Angiography*
Coronary Artery Disease*/diagnostic imaging
Coronary Angiography ; Humans ; Radiation Dosage ; Tomography, X-Ray Computed
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References:
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Contributed Indexing:
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Keywords: 320-row scanner; coronary CT angiography; coronary artery disease; radiation exposure
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Entry Date(s):
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Date Created: 20210810 Date Completed: 20210910 Latest Revision: 20240403
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Update Code:
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20240403
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PubMed Central ID:
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PMC8425931
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DOI:
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10.1002/acm2.13390
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PMID:
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34375023
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Objectives: The area detector 320-row CT scanner, which can cover the whole heart in one rotation, can aid in reducing radiation exposure during electrocardiography (ECG)-gated coronary CT angiography (CCTA). Recently, researchers have proposed dose-modulated dynamic CCTA with a 320-row scanner for the detection of functional myocardial ischemia. In the present study, we compared and validated the radiation dose of this method with that of the standard CCTA method and the latest diagnostic reference levels (DRLs).
Materials and Methods: The study included a total of 164 consecutive patients with suspected or known coronary artery disease (CAD) who underwent CCTA with a 320-row scanner. The patients were randomly divided into dynamic and standard CCTA groups, and the CT dose index (CTDIvol) and dose length product (DLP) calculated by the CT system were compared between the two protocols and with the latest DRL.
Results: Standard and dynamic CCTA scans were performed in 77 and 87 patients, respectively. CTDIvol was significantly higher for standard CCTA than for dynamic CCTA (41 ± 35 mGy vs. 22 ± 7 mGy, p = 0.0014). DLP was also significantly higher for standard CCTA than for dynamic CCTA (864 ± 702 mGy × cm vs. 434 ± 106 mGy × cm, p < .0001). For standard scans, CTDIvol and DLP exceeded the 2020 DRL in Japan in 16% (12/77) and 17% (13/77) of cases, respectively. In contrast, rates for the dynamic scan were only 1% (1/87) for CTDIvol and 0% (0/87) for DLP.
Conclusion: The dose of radiation exposure during dynamic CCTA with a 320-row scanner does not exceed that of standard CCTA and is sufficient to meet the latest DRL. Thus, our results suggest that the method is safe from the perspective of radiation exposure.
(© 2021 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine.)
