Study on examinee's dose delivered in computed tomography.
Dose profiles are presented resulting from computed tomography (CT). The profiles 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 resulting 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 dose measurement are noted, which may assist in the practical application of IBSS (International Basic Standard of Radiation Protection and Safety of Radiation Sources) guide levels.
Department of Physics and Materials Science, City University of Hong Kong, China. aptcheun@cityu.edu.hk
T
T
Cheung
Q
Q
Cheng
D
D
Feng
M J
MJ
Stokes
D000005:Abdomen; D000488:Allied Health Personnel; D006257:Head; D006801:Humans; D016273:Occupational Exposure; D019047:Phantoms, Imaging; D019904:Polymethyl Methacrylate; D011871:Radiology; D012044:Regression Analysis; D013116:Spinal Cord; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation / Q000379:methods; D013909:Thorax; D014057:Tomography, X-Ray Computed; D014965:X-Rays
D019904:Polymethyl Methacrylate