<![CDATA[Measurement of Computed Tomography Dose Index (CTDI) Distribution in Body Phantom has been done in Dr. Karyadi’s Hospital. The purpose of this research were to find out value of CTDI in the five holes in body phantom and to determine relation between slice thickness and CTDI. This research used CT Dose Profiler in helical CT and CT Dose Profile Analyzer Software. This measurement applied protocol of abdomen with tube voltage 120 kV, time rotation 200 mAs, pitch 1, scan length 160 mm, and scan time 5, 07 second. Measurement was applied variation of detector position in the five holes (center, top perifer, right perifer, bottom perifer, and left perifer) and slice thickness 1 mm, 2 mm, and 3 mm. Average CTDI value in five holes of body phantom has range about 11,97 mGy until 13,17 mGy. There are slight differences among all of five holes. It show that dose ditribution in the center and perofer of body phantom tend to be homogeneous. The fluctuation of CTDI values for 1 mm, 2 mm, and 3 mm slice thickness has nocertain pattern or trend. CTDI values have slight differences among the thickness. The measurement show that 1 mm, 2 mm, and 3 mm slice thickness has 0,5 mGy difference to CTDI value. Keyword: CTDI, five holes, body phantom, slice thickness]]>
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