Exposure and dose in panoramic radiology

被引:9
作者
Goldstein, A [1 ]
机构
[1] Wayne State Univ, Sch Med, Dept Radiol, Detroit, MI 48201 USA
关键词
panoramic radiology; rotational tomography; entrance skin exposure; partial volume effect; finite volume effect;
D O I
10.1118/1.598285
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 [临床医学]; 100207 [影像医学与核医学]; 1009 [特种医学];
摘要
Panoramic radiology entrance skin exposure (ESE) was measured for a Siemens Orthopantomograph 10 E using a thimble chamber and TLDs. Thimble chamber measurements are shown to be inaccurate for the moving, narrow beam panoramic scan geometry due to partial volume and partial charged-particle equilibrium effects. For 75 KVp, 8 mA panoramic scans the TLD measured beam central ray ESE on the scan central plane (patient midsagittal plane) was an approximately constant 20 mR for the first 7.5 cm from the entrance slit. A theoretical model of central plane ESE for a fixed rotation center agrees very well with the TLD measurements and is consistent with all of the known ESE (and dose) properties near rotation centers. Head phantom skin dose measurements demonstrate the dependence of skin dose on exact equipment mode of use and patient anatomy. Central plane, beam central ray ESE is judged to be a convenient, universal measure of panoramic radiology radiation output. (C) 1998 American Association of Physicists in Medicine. [S0094-2405(98)02606-6].
引用
收藏
页码:1033 / 1040
页数:8
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