Radiation dose for 320-row dose-modulated dynamic coronary CT angiography
Yukako Izoe1, Michinobu Nagao2, Mei Tokai3
1Graduate School of Medicine, Health Sciences, Division of Radiological Examination and Technology, Tohoku University, Sendai City, Japan.
Journal of Applied Clinical Medical Physics
|August 10, 2021
Summary
Dynamic CT coronary angiography (CCTA) using a 320-row scanner significantly reduces radiation exposure compared to standard CCTA. This advanced method ensures radiation doses remain within diagnostic reference levels, enhancing patient safety.
Area of Science:
- Radiology
- Cardiovascular Imaging
- Medical Physics
Background:
- Coronary CT angiography (CCTA) with 320-row scanners offers reduced radiation exposure.
- Dose-modulated dynamic CCTA is a newer technique for detecting myocardial ischemia.
Purpose of the Study:
- To compare radiation doses of dynamic CCTA versus standard CCTA.
- To validate dynamic CCTA against diagnostic reference levels (DRLs).
Main Methods:
- 164 patients with suspected coronary artery disease underwent CCTA using a 320-row scanner.
- Patients were randomized into dynamic or standard CCTA groups.
- CTDIvol and DLP were compared between groups and with 2020 Japanese DRLs.
Main Results:
- Dynamic CCTA showed significantly lower CTDIvol (22 ± 7 mGy vs. 41 ± 35 mGy) and DLP (434 ± 106 vs. 864 ± 702 mGy×cm) than standard CCTA.
- Standard CCTA exceeded DRLs in 16-17% of cases, while dynamic CCTA exceeded them in only 0-1% of cases.
- Dynamic CCTA doses were within DRLs for nearly all patients.
Conclusions:
- Dynamic CCTA with a 320-row scanner is safe regarding radiation exposure.
- The radiation dose of dynamic CCTA is comparable to or lower than standard CCTA.
- Dynamic CCTA meets the latest diagnostic reference levels for coronary CT angiography.
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