Study on examinee's dose delivered in computed tomography

Dose profiles are presented resulting from computed tomography (CT). The pr ofiles are positioned at the central axis, 1 cm away from the outer surface of the phantom, for single and multiple scans. A Hitachi W-1000 scanner is used with a thermoluminescent dosimeter (TLD), and standard dosimetry head and trunk phantoms. Regression equations are found linking the dose result ing From scattered radiation associated with a single scan to the distance from the scanning centre. The impact on the CT dose index value (CTDI) For varying integrating lengths is analysed. Some problems associated with CT d ose measurement are noted, which may assist in the practical application of IBSS (International Basic Standard of Radiation Protection and Safety of R adiation Sources) guide levels.