AbstractID: 8855 Title: Multi System Comparison of Patient Doses in Interventional Radiology Multi System Comparison of Patient Doses in Interventional Angiographic Systems. Recently, greater emphasize has given to the level of radiation dose delivered in diagnostic interventional procedures due to the extensive use of X-rays in this technique. In this study for a total of 260 patients, Dose- Area product (DAP) and air-kerma at the patient entrance surface have been measured with Diamentor M4KDK system, Thermoluminesence Dosimeters (TLD) were also used as an alternative technique for skin dose measurements. Categorisation of angiographic procedures were made according to the anatomy imaged (cerebral, carotid, hepatic, thoracic, renal, upper and lower extremities). Fluoroscopic and radiographic DAP values were recorded seperately, together with exposure related paremeters (kVp, exposure time, mA, image intensifier (II) magnification factor, patient irradiation geometry, etc.) Performance test of angiographic units used in these studies (three Siemens and one GE) was also carried out. Results of DAP values for fluoroscopy and radiography and some exposure parameters were given for each procedure. Maximum values of DAP and skin dose from TLD measurement were found 255 Gy-cm2 and 1060 mGy respectively, 37 mSv and 45 mSv are the maximum effective dose values determined from TLD and DAP measurements . Variation of patient doses with the output of angiographic units was investigated. However the complexity of the procedures as well as the skill of the radiologist are found as the main factor effecting patient doses. The collected data will also be important regarding to the establishment of reference levels of the Country.