RADIATION-DOSE FOR INVESTIGATION OF THE CHEST AND ABDOMEN - COMPARISON OF SEQUENTIAL SPIRAL AND ELECTRON-BEAM COMPUTED-TOMOGRAPHY

Comparison of radiation exposure applied by different types of CT scan ners for the investigation of the chest and abdomen. Determination of radiation exposure applied by multi-phase spiral CT. Estimation of the dose in air in the system axis of the scanner, the CT dose index (CTD I) and the effective dose for electron beam tomography (EBT) and two c onventional CT scanners (sequence, SEQ; spiral, SCT). For EBT, dose in system axis for investigation of the abdomen was above 50 mGy. Effect ive dose for investigation of the chest and abdomen was higher with EB T (11 and 26 mSv, respectively) than with conventional CT (SEQ,4 and 2 0 mSv; SCT, 2 and 7 mSv). The effective dose for a biphasic investigat ion (liver 5 mSv, kidney 4 mSv) was below,fora triphasic investigation (liver 7 mSv) above the effective dose of the investigastion of the a bdomen (6 mSv). Investigation of the abdomen with the EBT should only be performed for certain indications. With spiral CT,effective dose is much lower than with EBT.