|ECR 2013 / C-0876|
|Radiation dose reduction in cardiovascular CT angiography with latest generation dose-saving scanner technology|
Methods and Materials
391 CT coronary angiograms (CTCA) performed in the clinical routine of our institution were randomly selected and retrospectively analyzed regarding the effective radiation dose (ED) applied to the patient. ED [mSv] was estimated from the dose-length product [mGy×cm] and an organ weighting factor [k=0.014 mSv×(mGy×cm)−1]. 100 examinations were performed on a 16-slice single-source multi-detector CT (SSCT; Somatom Sensation 16, Siemens Healthcare, Germany), 199 examinations on a first generation dual-source multi-detector CT (DSCT; Somatom Definition, Siemens Healthcare, Germany) and 92 examinations on a second generation DSCT (Somatom Definition Flash, Siemens Healthcare, Germany) equipped with latest dose-saving technology. Image quality was assessed by two readers with an experience of more than 5 years in the reading of CT angiograms.
Continuous and categorical parameters were analyzed using t-Tests and Pearson product moment correlation as appropriate. Multivariate linear regression analysis was used to identify unique predictors of estimated dose. Statistical analysis was performed using the R software environment for statistical computing.
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