Radiation dosis in computed tomography: observation in three hospitals from the Region of Valparaiso, Chile

Abstract

Ionizing radiation doses in computed tomography (CT) have the potential to generate harmful effects. The issue is not insignificant and the question remains as to how dose management is situated, specifically, in Chile. The objective of this work is to record and summarize the doses per patient in CT examination in three health institutions in the Valparaíso Region. A prospective descriptive study was carried out over 3 months, including examinations of the head, chest, abdomen and pelvis in adults. Associated DICOM files were collected to extract values of relevant variables. Different dose distributions were observed between hospitals, as they had different equipment and protocols. The CTDI (Computed Tomography Dose Index) medians observed are generally within the international range, but with a large proportion of exams exceeding these values. The most relevant variables in dose control were the number of series associated with each exam, and the tube current. This study shows that the doses given to patients in these three institutions are consistent with what is reported internationally, with some existing room for improvement. It remains to be confirmed whether these conclusions can be extended to other institutions and other regions of Chile.