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
2008年
3期
294-296
,共3页
曾勇明%吴富荣%张志伟%欧阳羽%谭秀洪%金瑞
曾勇明%吳富榮%張誌偉%歐暘羽%譚秀洪%金瑞
증용명%오부영%장지위%구양우%담수홍%금서
数字X线摄影%模拟病变%胸部体模%放射线剂量
數字X線攝影%模擬病變%胸部體模%放射線劑量
수자X선섭영%모의병변%흉부체모%방사선제량
Digital Radiography%Simulated Lesion%Chest Phantom%Radiation Dose
目的 比较非品硒平板探测器DR与CR对模拟肺部病变的描述,并对剂量降低情况进行评价.方法 模拟线状、网状和结节病变结构置人仿真胸部体模内,应用DR和CR分别对不同mAs设置的体模曝光,记录体模的入射体表剂量.收集不同剂量的硬拷贝照片,由4位放射医师随机地实施模拟肺部病变显示度评价.采用秩和(Wilcoxon)检验进行统计学分析.结果 用2.0、3.2 mAs曝光时,DR与CR对模拟线状、网状病变的显示度差异有统计学意义(模拟线状病变:Z=-2.032.P=0.042;Z=-2.375,P=0.018.模拟网状病变:Z=-2.680,P=0.007;Z=-2.670,P=0.008).用5.0、6.3 mAs曝光时,两者对模拟线状、网状病变的显示度差异无统计学意义(P>0.05).2.0、3.2、5.0、6.3 mAs曝光档,对于小结节(直径小于10 mm)的检测DR均优于CR(Z:-2.237,P=0.018;Z=-2.384,P=0.017;Z=-2.388,P=0.017;Z=-2.366,P=0.018).当3种模拟肺部病变都显示清楚时.用非晶硒DR系统的入射体表剂量降低约65%.结论 对微小低对比病变的描述,非晶硒平板探测器DR优于CR且明显地降低曝光剂晕.
目的 比較非品硒平闆探測器DR與CR對模擬肺部病變的描述,併對劑量降低情況進行評價.方法 模擬線狀、網狀和結節病變結構置人倣真胸部體模內,應用DR和CR分彆對不同mAs設置的體模曝光,記錄體模的入射體錶劑量.收集不同劑量的硬拷貝照片,由4位放射醫師隨機地實施模擬肺部病變顯示度評價.採用秩和(Wilcoxon)檢驗進行統計學分析.結果 用2.0、3.2 mAs曝光時,DR與CR對模擬線狀、網狀病變的顯示度差異有統計學意義(模擬線狀病變:Z=-2.032.P=0.042;Z=-2.375,P=0.018.模擬網狀病變:Z=-2.680,P=0.007;Z=-2.670,P=0.008).用5.0、6.3 mAs曝光時,兩者對模擬線狀、網狀病變的顯示度差異無統計學意義(P>0.05).2.0、3.2、5.0、6.3 mAs曝光檔,對于小結節(直徑小于10 mm)的檢測DR均優于CR(Z:-2.237,P=0.018;Z=-2.384,P=0.017;Z=-2.388,P=0.017;Z=-2.366,P=0.018).噹3種模擬肺部病變都顯示清楚時.用非晶硒DR繫統的入射體錶劑量降低約65%.結論 對微小低對比病變的描述,非晶硒平闆探測器DR優于CR且明顯地降低曝光劑暈.
목적 비교비품서평판탐측기DR여CR대모의폐부병변적묘술,병대제량강저정황진행평개.방법 모의선상、망상화결절병변결구치인방진흉부체모내,응용DR화CR분별대불동mAs설치적체모폭광,기록체모적입사체표제량.수집불동제량적경고패조편,유4위방사의사수궤지실시모의폐부병변현시도평개.채용질화(Wilcoxon)검험진행통계학분석.결과 용2.0、3.2 mAs폭광시,DR여CR대모의선상、망상병변적현시도차이유통계학의의(모의선상병변:Z=-2.032.P=0.042;Z=-2.375,P=0.018.모의망상병변:Z=-2.680,P=0.007;Z=-2.670,P=0.008).용5.0、6.3 mAs폭광시,량자대모의선상、망상병변적현시도차이무통계학의의(P>0.05).2.0、3.2、5.0、6.3 mAs폭광당,대우소결절(직경소우10 mm)적검측DR균우우CR(Z:-2.237,P=0.018;Z=-2.384,P=0.017;Z=-2.388,P=0.017;Z=-2.366,P=0.018).당3충모의폐부병변도현시청초시.용비정서DR계통적입사체표제량강저약65%.결론 대미소저대비병변적묘술,비정서평판탐측기DR우우CR차명현지강저폭광제훈.
Objective To compare an amorphous selenium fiat-panel detector digital radiography(DR) with a computed radiography(CR) for the depiction of simulated pulmonary lesion,as well as for evaluation of dose reduction.Methods Simulated linear,reticular,and nodular lesion were located in all anthropomorphic chest phantom.The phantom was exposed by DR and CR with different mAs sets.The entrance surface doses were recorded for all images.Hard copy images were generated at different dose levels.Images were presented in a random order to four independent radiologists.They subjectively rated the visibility of simulated pulmonary lesion. Statistical significance of difference was analvsed with wilcoxon test.Resuits The visibility of simulated linear and reticular lesions on the images obtained with DR was superior to the images from CR at 2.0 and 3.2 mAs.P <0.05(Simulated linear lesion:Z=-2.032,P=0.042;Z=-2.375,P=0.018.Simulated reticular lesion:Z=-2.680,P=0.007;Z=-2.670,P=0.008).However,there wag no statistically significant difference between DR and CR at 5.0 and 6.3 mAs(P>0.05).DR was superior to CR in detection sinail nodular(diameter<10 mm)lesions at different dose level(mAs:2.0,3.2,5.0,6.3),P<0.05(Z=-2.237, P=0.018;Z=-2.384,P=0.017;Z=-2.388,P=0.017;Z=-2.366,P=0.018).When the visibility of simulated pulmonary lesion for DR and CR were equal,The radiation dose was reduce approximately 65% with the DR.Conclusious DR was superior to CR in depiction of tiny lesion and dose reduction greatly.