ESTABLISHMENT OF COMPUTED TOMOGRAPHY REFERENCE DOSELEVELS IN ONASSIS CARDIAC SURGERY CENTER

摘要

The purpose of the study was to apply European Commission (EC) Reference Dose Levels (RDL) in ComputedrnTomography (CT) examinations at Onassis Cardiac Surgery Center (OCSC). These are weighted CT Dose Indexrn(CTDIw) for a single slice and Dose-Length Product (DLP) for a complete examination. During the period 1998-rn1999, the total number of CT examinations, every type of CT examination, patient related data and technicalrnparameters of the examinations were recorded. The most frequent examinations were chosen for investigationrnwhich were the head, chest, abdomen and pelvis. CTDI measurements were performed and CTDIw and DLP wererncalculated. Third Quartile values of CTDIw were chosen to be 43mGy for head, 8mGy for chest, and 22mGy forrnabdomen and pelvis examinations. Third Quartile values of DLP were chosen to be 740mGycm for head,rn370mGycm for chest, 490mGycm for abdomen and 420mGycm for pelvis examination. Results confirm thatrnOCSC follows successfully the proposed RDL for the head, chest, abdomen and pelvis examinations in terms ofrnradiation dose.