Clinical comparative study with a large-area amorphous silicon flat-panel detector: Image quality and visibility of anatomic structures on chest radiography
Clinical comparative study with a large-area amorphous silicon flat-panel detector: Image quality and visibility of anatomic structures on chest radiography
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DOI：
10.2214/ajr.178.2.1780481
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发表时间：
2002-02-01
影响因子：
5
通讯作者：
Hansmann, J
中科院分区：
文献类型：
--
作者：
Fink, C;Hallscheidt, PJ;Hansmann, J
OBJECTIVE.本研究的目的是比较大面积平板数字X线摄影系统和传统胶片屏幕X线摄影系统的临床胸片。比较是基于观察者对图像质量和解剖结构可见性的偏好研究。使用大面积非晶硅平板探测器数字X线摄影系统（剂量相当于400速胶片系统）从100名连续肿瘤患者中获得常规随访胸片。将硬拷贝图像与在传统电影屏幕系统（200速）上拍摄的相同个体的先前检查进行比较。如果检测到胸部解剖结构的变化或检查之间的时间间隔超过1年，则排除患者。观察者的偏好进行了评价的图像质量和能见度的15个解剖结构使用活点量表。胸部体模的剂量测量显示，与胶片-屏幕X射线摄影系统相比，数字X射线摄影系统的剂量降低约50%。使用数字平板探测器系统获得的图像质量和除一个解剖结构外的所有解剖结构的可见性均显著上级（p 0.0003）使用传统胶片-屏幕X线摄影系统获得的图像质量和可见性。结论。通过平板探测器系统获得的图像上的解剖结构的图像质量和可见性被认为等于或上级于传统的胶片屏幕胸部X线摄影的图像。这是真的，即使辐射剂量减少了约50%的数字平板探测器系统。
OBJECTIVE. The objective of this study was to compare clinical chest radiographs of a large-area, flat-panel digital radiography system and a conventional film-screen radiography stem. The comparison was based on an observer preference study of image quality and visibility of anatomic structures.MATERIALS AND METHODS. Routine follow-up chest radiographs were obtained from 100 consecutive oncology patients using a large-area, amorphous silicon flat-panel detector digital radiography system (dose equivalent to a 400-speed film system). Hard-copy images were compared with previous examinations of the same individuals taken on a conventional film-screen system (200-speed). Patients were excluded if changes in the chest anatomy were detected or if the time interval between the examinations exceeded 1 year. Observer preference was evaluated for the image quality and the visibility of 15 anatomic structures using a live-point scale.RESULTS. Dose measurements with a chest phantom showed a dose reduction of approximately 50% with the digital radiography system compared with the film-screen radiography system. The image quality and the visibility of all but one anatomic structure of the images obtained with the digital flat-panel detector system were rated significantly superior (p 0.0003) to those obtained with the conventional film-screen radiography system.CONCLUSION. The image quality and visibility of anatomic structures on the images obtained by the flat-panel detector system were perceived as equal or superior to the images from conventional film-screen chest radiography. This was true even though the radiation dose was reduced approximately 50% with the dig tal flat-panel detector system.