数字X线摄影系统中低剂量应用的探讨

目的 通过数字X线摄影系统（DR）在胸部摄影检查中的应用评价DR的低剂量的优越性。方法 利用CDRAD 2.0低对比细节体模评价计算机X线摄影（CR）和DR的影像质量和表面空气吸收剂量（ESD）关系,分别利用两个系统（DR使用ESD约为CR的1/3）得到成人胸部30幅影像。由6位影像科医生来评价以上两者的影像系统对于肩胛骨内侧边缘等胸部结构的清晰程度。结果 CR影像和减少ESD的DR影像在影像诊断质量上差异没有统计学意义（P＞0.05）。结论 DR的较好的分辨率和低噪声特性,以及高DQE有助于减少患者接受的辐射剂量,而不影响诊断质量。

Low-dose investigation of digital radiography system image

ObjectiveTo evaluate the low dose performance of digital radiography system for the imaging of chest. Methods In this experiment, the radiography of CDRAD 2.0 contrast-detail phantom was done in order to evaluate the relations between image quality and entrance surface dose. Thirty chest radiographys were obtained by CR and DR, the ESD of DR used at 1/3 of CR's. The image definition of medial borders of the scapulae et al was evaluated by six doctors from department of radiology. Results The result indicated no statistically significant different in diagnostic quality between from the investigational system and from CR(P>0.05). ConclusionThe superior resolution, low noise characteristics and high DQE of digital radiography can be utilized to decrease the radiation dose exposure to patients, without influencing the diagnostic quality.