中国医疗设备Issue(11)：41-42,71,3.DOI:10.3969/j.issn.1674-1633.2014.11.011
多排螺旋CT剂量效率的体模研究
Phantom Study of Dose Efifciency of MDCT
摘要
Abstract
Objective To explore the accuracy ofCTDI100 in evaluating radiation dose of CT examination. Methods Dose distribution curves of the phantom under the conditions of different collimation widths, pitches and tube voltages were measured with long-pole ionization chamber and thenCTDI100 and CTDI∞were calculated to evaluate the dose efficiency of CT examination.Results The range of CT radiation dose efifciency was 79%~94%. The range of CT radiation dose efifciency located at the center was 79%~87% and that of CT radiation dose efifciency located at margins was 79%~94% while that of weighted CT radiation dose efifciency was 82%~90%. The longer the collimation widths and pitches, the lower the CT radiation dose efifciency. The inlfuence of tube voltages on CT radiation dose efifciency was unconspicuous.Conclusion There were certain differences betweenCTDI100 andCTDI∞ in evaluating radiation dose of CT examination. The accuracy ofCTDI100 andCTDIw in evaluating radiation dose of CT examination would be decreased as the increasement of collimation widths and pitches.关键词
CTDI100/多排螺旋CT/准直宽度/CT剂量效率Key words
CTDI100/MDCT/collimation widths/CT radiation dose efifciency分类
医药卫生引用本文复制引用
庄静文,白玫,侯艺威..多排螺旋CT剂量效率的体模研究[J].中国医疗设备,2014,(11):41-42,71,3.基金项目
国家自然科学基金项目资助（81372923）；国家科技支撑计划课题（2011BAI02B02）。 （）
