中国医疗设备
中國醫療設備
중국의료설비
CHINA MEDICAL EQUIPMENT
2014年
11期
41-42,71
,共3页
庄静文%白玫%侯艺威
莊靜文%白玫%侯藝威
장정문%백매%후예위
CTDI100%多排螺旋CT%准直宽度%CT剂量效率
CTDI100%多排螺鏇CT%準直寬度%CT劑量效率
CTDI100%다배라선CT%준직관도%CT제량효솔
CTDI100%MDCT%collimation widths%CT radiation dose efifciency
目的:研究CTDI100表征CT检查所致辐射剂量的准确性。方法使用长杆电离室测量不同准值宽度、螺距以及管电压下体模内剂量分布曲线并计算CT剂量效率。结果 CT剂量效率范围为79%~94%,其中,中心位置的CT剂量效率范围为79%~87%,边缘4个位置的CT剂量效率范围为79%~94%,加权CT剂量效率范围为82%~90%。准直宽度与螺距越大,CT剂量效率越低;CT剂量效率受管电压影响不明显。结论CTDI100与CTDI∞之间存在一定差异,CTDI100、CTDIw表征CT检查所致辐射剂量的准确度随准直宽度和螺距的增大而降低。
目的:研究CTDI100錶徵CT檢查所緻輻射劑量的準確性。方法使用長桿電離室測量不同準值寬度、螺距以及管電壓下體模內劑量分佈麯線併計算CT劑量效率。結果 CT劑量效率範圍為79%~94%,其中,中心位置的CT劑量效率範圍為79%~87%,邊緣4箇位置的CT劑量效率範圍為79%~94%,加權CT劑量效率範圍為82%~90%。準直寬度與螺距越大,CT劑量效率越低;CT劑量效率受管電壓影響不明顯。結論CTDI100與CTDI∞之間存在一定差異,CTDI100、CTDIw錶徵CT檢查所緻輻射劑量的準確度隨準直寬度和螺距的增大而降低。
목적:연구CTDI100표정CT검사소치복사제량적준학성。방법사용장간전리실측량불동준치관도、라거이급관전압하체모내제량분포곡선병계산CT제량효솔。결과 CT제량효솔범위위79%~94%,기중,중심위치적CT제량효솔범위위79%~87%,변연4개위치적CT제량효솔범위위79%~94%,가권CT제량효솔범위위82%~90%。준직관도여라거월대,CT제량효솔월저;CT제량효솔수관전압영향불명현。결론CTDI100여CTDI∞지간존재일정차이,CTDI100、CTDIw표정CT검사소치복사제량적준학도수준직관도화라거적증대이강저。
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.