中华放射学杂志
中華放射學雜誌
중화방사학잡지
Chinese Journal of Radiology
2010年
7期
744-746
,共3页
放射摄影术%辐射剂量%曝光参数%图像质量
放射攝影術%輻射劑量%曝光參數%圖像質量
방사섭영술%복사제량%폭광삼수%도상질량
Radiography%Radiation dosage%Exposure parameter%Image quality
目的 探讨数字X线摄影系统适宜曝光量设置方法,以确保图像质量和降低受检者受辐射剂量.方法 以树脂体模和对比度-细节测试体模(CDRAD2.0)为被照体,使用碘化铯探测器和硫氧化钆探测器的两种数字X线系统进行不同曝光参数成像.记录体模表面空气吸收剂量并进行秩和检验,用CDRAD分析软件计算图像质量因子函数(IQFinv),对相同曝光条件下的IQFinv值进行配对t检验,根据IQFinv值和系统感度确定这两种数字X线系统的适宜曝光量.结果 不同曝光条件下,两种数字X线系统体模表面空气吸收剂量差异没有统计学意义(P>0.05).碘化铯和硫氧化钆两种探测器的数字X线系统平均IQFinv值在125 kV时分别为4.89±1.01和2.47±0.25,70 kV时平均为5.10±1.05和2.38±0.43,相同曝光条件下两种数字X线系统IQFinv值差异有统计学意义(t值分别为6.509、10、158、P值均<0.05),碘化铯和硫氧化钆两种探测器的数字X线系统适宜曝光量之比约为1:2.结论 以IQFinv值为参考,可以量化不同数字X线系统最适曝光量差别,为正确设置曝光参数提供依据.
目的 探討數字X線攝影繫統適宜曝光量設置方法,以確保圖像質量和降低受檢者受輻射劑量.方法 以樹脂體模和對比度-細節測試體模(CDRAD2.0)為被照體,使用碘化銫探測器和硫氧化釓探測器的兩種數字X線繫統進行不同曝光參數成像.記錄體模錶麵空氣吸收劑量併進行秩和檢驗,用CDRAD分析軟件計算圖像質量因子函數(IQFinv),對相同曝光條件下的IQFinv值進行配對t檢驗,根據IQFinv值和繫統感度確定這兩種數字X線繫統的適宜曝光量.結果 不同曝光條件下,兩種數字X線繫統體模錶麵空氣吸收劑量差異沒有統計學意義(P>0.05).碘化銫和硫氧化釓兩種探測器的數字X線繫統平均IQFinv值在125 kV時分彆為4.89±1.01和2.47±0.25,70 kV時平均為5.10±1.05和2.38±0.43,相同曝光條件下兩種數字X線繫統IQFinv值差異有統計學意義(t值分彆為6.509、10、158、P值均<0.05),碘化銫和硫氧化釓兩種探測器的數字X線繫統適宜曝光量之比約為1:2.結論 以IQFinv值為參攷,可以量化不同數字X線繫統最適曝光量差彆,為正確設置曝光參數提供依據.
목적 탐토수자X선섭영계통괄의폭광량설치방법,이학보도상질량화강저수검자수복사제량.방법 이수지체모화대비도-세절측시체모(CDRAD2.0)위피조체,사용전화색탐측기화류양화구탐측기적량충수자X선계통진행불동폭광삼수성상.기록체모표면공기흡수제량병진행질화검험,용CDRAD분석연건계산도상질량인자함수(IQFinv),대상동폭광조건하적IQFinv치진행배대t검험,근거IQFinv치화계통감도학정저량충수자X선계통적괄의폭광량.결과 불동폭광조건하,량충수자X선계통체모표면공기흡수제량차이몰유통계학의의(P>0.05).전화색화류양화구량충탐측기적수자X선계통평균IQFinv치재125 kV시분별위4.89±1.01화2.47±0.25,70 kV시평균위5.10±1.05화2.38±0.43,상동폭광조건하량충수자X선계통IQFinv치차이유통계학의의(t치분별위6.509、10、158、P치균<0.05),전화색화류양화구량충탐측기적수자X선계통괄의폭광량지비약위1:2.결론 이IQFinv치위삼고,가이양화불동수자X선계통최괄폭광량차별,위정학설치폭광삼수제공의거.
Objective To evaluate the difference of adaptive exposure dose in two digital X-ray imaging systems. Methods Resin phantom and contrast-detail test phantom were used on Cesium iodide and Gadolinium oxide sulfide plate imaging detector DR systems using difference exposure parameters. All entrance surface dose were recorded, Image quality index (IQFinv ) was calculated by CDRAD analysis software. The optimal exposure radiation dose was determined according to the sensitivity and IQFinv. Results There were no significant differences of entrance surface dose between two digital X-ray systems on two different exposure parameters with 70 kV ( P > 0. 05) , while there were significant differences with 125 kV(P < 0.05) . The maximum difference was 28. 57% . The mean IQFinv value of Cesium iodide detector DR and Gadolinium oxide sulfide detector DR with 125 kV and 70 kV were 4. 89 ±1. 01 and 2.47 ±0.25, 5. 10 ±1.05 and 2.38 ±0.43, respectively. There were significant diferences between the two systems under the same exposure parameters (t = 6. 509,10. 158, P < 0. 05). The optimal exposure dose ratio between Cesium iodide and Gadolinium oxide sulfide detector DR system was 1:2. Conclusion According to the IQFinv value, the adaptive exposure parameter can be adjusted to achieve good image quality with low radiation dose on different digital radiography systems.
