THE MEASUREMENT OF CT SCANNER RADIATION-DOSE PROFILE USING TL DOSIMETERS

Thermoluminescence detectors in the form of thin discs were used for d ose profile measurement of CT scanners CT/T8800, CT9800 and CT MAX mad e by General Electric, CT 1200 SX made by Picker and SOMATOM 2 made by Siemens. Effective energy of a CT scanner X ray beam was evaluated pr ior to calibration and measurement. Dose profiles of all nominal slice thicknesses down to 1.5 mm and of a multiple scan were measured for e ach CT scanner. CT dose indexes (CTDI) were derived from the dose prof iles and compared with values measured by a pencil type ionisation cha mber.