中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2014年
3期
225-227
,共3页
曹允希%蔡小涛%谢晋东%曹鑫
曹允希%蔡小濤%謝晉東%曹鑫
조윤희%채소도%사진동%조흠
数字化X射线摄影%图像质量%入射表面剂量
數字化X射線攝影%圖像質量%入射錶麵劑量
수자화X사선섭영%도상질량%입사표면제량
Digital radiography%Image quality%Entrance surface dose
目的 研究数字化X射线胸部高千伏摄影曝光剂量与图像质量的关系,确定数字化X射线摄影最佳曝光剂量.方法 选择胸部高千伏摄影管电压120 kV,摄影mAs从1 mAs逐档增加至25 mAs,对模拟人体胸部厚度摄影体模与CDRAD 2.0对比度细节体模进行摄影,测量体模表面X射线入射剂量,由5位观察者独立阅读体模影像,比较任意两曝光条件组之间的图像质量因子(IQF),确定高千伏胸部摄影最佳条件.比较4和10 mAs条件下正常人体胸部摄影图像质量评分.结果 胸部高千伏摄影体模曝光条件从1 mAs增加到25 mAs,体模表面X射线入射剂量从0.067 mGy增加至1.468 mGy.随着X射线入射剂量的增加,影像质量影响因子IQF值不断减小,观察者阅读体模信号的IQF差异有统计学意义(F=31.00,P＜0.05),曝光剂量条件选择在1～4 mAs时所对应的IQF均值差异有统计学意义(F=15.3,P＜0.05),4～ 10 mAs时所对应的IQF差异无统计学意义,10～ 25 mAs时所对应的IQF均值差异有统计学意义(F=9.74,P＜0.05).曝光剂量条件选择4和10 mAs所对应的体模表面入射剂量为0.250和0.606 mGy,两种条件下胸部图像质量的综合评分分别为(24.8±1.64)、(25.8±2.05)分,差异无统计学意义.结论 随着数字化X射线摄影剂量的增加所获得图像信息量增加.满足临床诊断的标准人体胸部高千伏数字化X摄影最佳剂量为0.250 mGy左右.
目的 研究數字化X射線胸部高韆伏攝影曝光劑量與圖像質量的關繫,確定數字化X射線攝影最佳曝光劑量.方法 選擇胸部高韆伏攝影管電壓120 kV,攝影mAs從1 mAs逐檔增加至25 mAs,對模擬人體胸部厚度攝影體模與CDRAD 2.0對比度細節體模進行攝影,測量體模錶麵X射線入射劑量,由5位觀察者獨立閱讀體模影像,比較任意兩曝光條件組之間的圖像質量因子(IQF),確定高韆伏胸部攝影最佳條件.比較4和10 mAs條件下正常人體胸部攝影圖像質量評分.結果 胸部高韆伏攝影體模曝光條件從1 mAs增加到25 mAs,體模錶麵X射線入射劑量從0.067 mGy增加至1.468 mGy.隨著X射線入射劑量的增加,影像質量影響因子IQF值不斷減小,觀察者閱讀體模信號的IQF差異有統計學意義(F=31.00,P＜0.05),曝光劑量條件選擇在1～4 mAs時所對應的IQF均值差異有統計學意義(F=15.3,P＜0.05),4～ 10 mAs時所對應的IQF差異無統計學意義,10～ 25 mAs時所對應的IQF均值差異有統計學意義(F=9.74,P＜0.05).曝光劑量條件選擇4和10 mAs所對應的體模錶麵入射劑量為0.250和0.606 mGy,兩種條件下胸部圖像質量的綜閤評分分彆為(24.8±1.64)、(25.8±2.05)分,差異無統計學意義.結論 隨著數字化X射線攝影劑量的增加所穫得圖像信息量增加.滿足臨床診斷的標準人體胸部高韆伏數字化X攝影最佳劑量為0.250 mGy左右.
목적 연구수자화X사선흉부고천복섭영폭광제량여도상질량적관계,학정수자화X사선섭영최가폭광제량.방법 선택흉부고천복섭영관전압120 kV,섭영mAs종1 mAs축당증가지25 mAs,대모의인체흉부후도섭영체모여CDRAD 2.0대비도세절체모진행섭영,측량체모표면X사선입사제량,유5위관찰자독립열독체모영상,비교임의량폭광조건조지간적도상질량인자(IQF),학정고천복흉부섭영최가조건.비교4화10 mAs조건하정상인체흉부섭영도상질량평분.결과 흉부고천복섭영체모폭광조건종1 mAs증가도25 mAs,체모표면X사선입사제량종0.067 mGy증가지1.468 mGy.수착X사선입사제량적증가,영상질량영향인자IQF치불단감소,관찰자열독체모신호적IQF차이유통계학의의(F=31.00,P＜0.05),폭광제량조건선택재1～4 mAs시소대응적IQF균치차이유통계학의의(F=15.3,P＜0.05),4～ 10 mAs시소대응적IQF차이무통계학의의,10～ 25 mAs시소대응적IQF균치차이유통계학의의(F=9.74,P＜0.05).폭광제량조건선택4화10 mAs소대응적체모표면입사제량위0.250화0.606 mGy,량충조건하흉부도상질량적종합평분분별위(24.8±1.64)、(25.8±2.05)분,차이무통계학의의.결론 수착수자화X사선섭영제량적증가소획득도상신식량증가.만족림상진단적표준인체흉부고천복수자화X섭영최가제량위0.250 mGy좌우.
Objective To investigate optimal radiation dose for digital radiography by researching the correlation between radiation dose and image quality of high kV chest radiography.Methods The kV of chest radiography was setted on 120 kV while mAs was changed.The chest radiography phantom and the contrast detail phantom CDRAD2.0 were exposed by DR with different mAs from 1 to 25 mAs.The entrance doses were measured for all exposures and the images were read independently by 5 observers on a higher resolution monitor of diagnosis work station.The image quality figure (IQF) was measured for each image.Comparison of the mean IQFs with different exposure doses were conducted in order to determined which was the optimal exposure condition for high kV radiography.The image quality of normal adult using different mAs,4 and 10 mAs for high KV chest radiography was compared.Results When the mAs was increased from 1 to 25 mAs,the entrance doses varied from 0.067 to 1.468 mGy.With the entrance doses increasing,the value of IQF was decreased (F =31.00,P ＜ 0.05).The values of IQF were statistically different between 1 and 4 mAs(F =15.3,P ＜0.05),and between 10 and 25 mAs(F =9.74,P ＜0.05).At 4 and 10 mAs with the entrance dose 0.250 and 0.606 mGy,the synthesis score of chest high kV radiography from two kinds of exposure dose was (24.8 ± 1.64),(25.8 ± 2.05),with no statistically significant difference.Conclusions For digital radiography,increasing radiation dose can improve image information.The optimal entrance dose of high kV chest radiography for standard body was about 0.250 mGy.
