Evaluation of patients radiation dose and Cancer risk associated with Computed tomography Coronary angiography

Computed tomography coronary angiography (CTCA) has generated tremendous interest over the past 20 years because of its high diagnostic accuracy and efficacy in assessing patients with coronary artery disease. This method is related to high radiation dose, and this has raised serious concerns within the literature. Effective dose (E) may be a single parameter meant to reflect the relative risk from radiation exposure. Therefore, it is necessary to calculate this parameter to point relative radiation risk. The objectives of this study are to evaluate patients' exposure during diagnostic and estimate the radiation risk. A total of 790 patients was estimated of radiation risk dose for three years, respectively. The patient's exposure was estimated based on a Computed Tomography device's delivered radiation dose (Siemens Somatom Sensation 64 (64-MDCT)). The participating physicians obtained the parameters relevant to the radiation dose from the scan protocol generated by the CT system after each CTCA study. The parameters included the volume CT dose index (CTDIvol) and Dlp. The CTDI value, which is a basic radiation dose parameter of CT. The mean and range of CTDI and Dlp for three respective year was (2018) 10.18(42.73-1.14) , 458.2 (3112.64-1.14) , (2019) 15.1 (348.5-1.13), 554.4 (4328.2-1.13) and (2020) 10.2 (50.47-0.7), 393.27 (2575.8-1.13). Therefore, the CT acquisition parameter optimization is vital to reduce the dose to its minimal value. Patients' doses were slightly higher compared to previous studies. (author)