Introduction: Heart disease is the leading cause of death globally, with increasing cases of Atherosclerotic Cardiovascular Disease (ASVD) and coronary artery disease (CAD). Coronary CT angiography (CTA) is an advanced, non-invasive tool with high sensitivity for diagnosing CAD, offering advantages over traditional angiography, including 3D imaging and the ability to assess related structures. However, CTA involves ionizing radiation and contrast material. Several attempts have been made to record and assess the radiation doses in CTCA. Despite the implementation of various initiatives to reduce radiation exposure, there is a need for assessing the radiation exposure levels with CT examination. This study’s aim was to evaluate the radiation doses received by the adult patients during cardiac CT examination.

Methods: The retrospective study at a tertiary care hospital from May to August 2024 included adults over 15 undergoing CT angio on GE Healthcare Revolution EVO CT following standard protocol. The software on the unit generates Dose Length Product (DLP) for each patient scan, and the Effective Dose (E) was computed for each patient. Linear regression analyzed the relationship between effective dose, BMI, and injected contrast volume.

Results: The mean value of effective dose was observed to be 13. 55 mSv with a minimum of value of 0.175 mSv and maximum of 27.23mSv. The median DLP was found to be 943.26 mGy.cm, with minimum value of 12.47 mGy.cm. The linear regression analysis shows that there exists no dependence of effective dose on BMI and volume of the contrast injected.

Conclusion: Our audit shows values exceeding UK NDRLs for coronary CT angiography and coronary angiography, 4.3 mSv and 170 mGy.cm, respectively. The study suggests tailoring CTCA protocols for each patient to reduce radiation dose, optimize dosage based on patient size, improve patient selection, conduct regular audits, and raise public awareness about radiation risks.