Room: Exhibit Hall
Purpose: CT coronary angiography (CTTA) is increasingly utilized for the noninvasive assessment of coronary artery disease (CAD) due its ability to exclude or diagnose CAD with high accuracy and fast acquisition time diagnosis in symptomatic and asymptomatic patients. CT delivers high radiation doses to organs that are in the direct path of radiation beam. Thus, there is a potential risk of inducing cellular damage or radiation-induced cancer due to exponentially increased use of this technique in medicine. Exposure of the heart to high doses of ionizing radiation is associated with cardiac lesions, but there are no conclusive studies regarding ionization radiation at low doses and the risks involved for CTTA. . The purpose of this study is to review the literature describing the effect of radiation dose on the circulatory system, with emphasis on the heart during the CCTA procedures.
Methods: This article summarizes the existing data regarding biological hazards of radiation exposure associated to CCTA, the methodology used to estimate radiation exposure and the measures that can be taken to effectively reduce it.
Results: The results of a meta-analysis demonstrated the effective dose in recent bibliographies range between 4.3 and 11.6 mSv, and the patients were exposed to considerable radiation doses (radiosensitive organs, such as lens of the eye, breast, thyroid or heart).
Conclusion: Estimation of patient radiation risk helps to improve staff knowledge/consciousness of radiation exposure. Radiosensitive organs receive a significant radiation dose during CTA procedures, therefore rigorous reassessment of justification criteria and optimization measures of the procedure are needed. The main factor observed was the different methodologies of dose estimates found in literature. A national survey is highly recommended to establish a diagnostic reference level for CTA. A CTA procedure is operator-dependent. Therefore, continuous training in CTA use and safety is crucial.