【摘要】 目的通过数字 X 线摄影(DR)系统在腰椎摄影检查中的应用,评价 DR 低剂量的优越性。方法利用 CDRAD 2.0低对比细节体模评价计算机摄影(CR)和 DR 的影像质量及表面空气吸收剂量(ESD)的关系,分别利用两个系统(DR 使用 ESD 约为 CR 的1/3)得到30例腰椎间盘突出症患者的腰椎影像30幅。由6名影像科医师来评价以上二者对于 L1和 L2横突骨小梁显影的清晰程度。结果单独影像观察中,两组影像科医师对 CR 和 DR 影像的判别结果之间差异无统计学意义(t=0.369,P>0.05);比较影像观察中,影像科医师在 CR 和 DR 的影像之间判断横突骨小梁的清晰程度差异无统计学意义(t=0.471,P>0.05)。结论 DR 较好的分辨率和低噪声特性,以及高量子检测效率(DQE)有助于减少患者接受的辐射剂量,而不影响诊断质量。更多还原

【Abstract】 Objective To evaluate the low dose performance of digital radiography(DR)system for radiography of the lumbar spine.Methods In the experiment CDRAD2.0 contrast-detail phantom was used for the evaluating the relation between the image qualities of both the computed radiography(CR)and digital radiography(DR)and the entrance surface dose(ESD).Thirty images of adult lumbar spine were radiographed by CR and DR separately,with ESD of DR being set at 1/3 of that of CR.Six radiologists reviewed the images obtained with both CR and DR,focusing on the details of bone trabecula of the first and second lumbar spine.Results In separate reading of either CR or DR images by the two groups,the results showed no statistically significant difference between CR and DR(t=0.369,P>0.05).In cross- comparison reading,the results also showed no statically significant difference in the image details of bony trabecula between CR and DR(t=0.471,P>0.05).Conclusion The superior resolution,low noise and high detective quantum efficiency(DQE)characteristics of DR can be utilized to decrease the radiation dosage,while not compromising the imaging quality.更多还原