|ECR 2013 / C-0876|
|Radiation dose reduction in cardiovascular CT angiography with latest generation dose-saving scanner technology|
Mean ED for CTCA was 10.57±2.76 mSv on the SSCT scanner, 6.96±3.59 mSv on the DSCT standard scanner compared to 1.19±0.66 mSv on the Flash scanner (SSCT vs. DSCT t-Test: p<0.001, DSCT vs. Flash t-Test p<0.001). Compared to SSCT, mean dose reduction with Flash was >88% (>82% compared to DSCT). 72% (66/92) of all examinations on the Flash scanner had an ED < 1 mSv.
Using mutivariate regression analysis the acquistion mode (Flash-Helix vs. Gated-Helix; -6.48 mSv; p<0.001), the body mass index (BMI; 0.24 mSv per kg/m2 increase; p<0.001) and the total scan length along the longitudinal axis of the patients (0.41 mSv per cm increase; p<0.001) were identified as unique predictors of estimated dose. In a subgroup of Gated-Helix acquisitions also the Hounsfield units (HU) measured with a region of interest in the lumen of the thoracic aorta were negatively correlated with estimated dose (R=-0.38; p<0.001).
Regardless of the scanner, image quality was rated as diagnostic in all CTCAs. However, the average image quality was rated best on the Flash scanner.
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