Weatherburn G C, Bryan S, West M
Health Economics Research Group, Brunel University, Uxbridge, Middlesex, UK.
Br J Radiol. 1999 Jul;72(859):653-60. doi: 10.1259/bjr.72.859.10624322.
A comparison has been made of the reject rates of plain images for three separate periods when film, computed radiography (CR) and PACS systems were in operation throughout the Hammersmith Hospital, London. There was a statistically significant reduction in the overall percentage reject rate across all examinations from 9.9% to 8.1% when the hospital changed from using a conventional film based system to a CR system. There was a further reduction in the reject rate to 7.3% when the hospital moved to a hospital-wide PACS system, but this change was not statistically significant. Using estimations of the total number of images used, the percentage reject rates were 6.6% for film, 5.5% for CR and 5.5% for PACS. Thus, if the radiation dose for each image is unchanged, and the same types of images are used for the examination of each body area, a move from conventional film imaging to phosphor plate imaging provides the potential to reduce the patient population dose.
对伦敦哈默史密斯医院在使用胶片、计算机X线摄影（CR）和PACS系统的三个不同时期普通影像的拒收率进行了比较。当医院从使用传统的基于胶片的系统转变为CR系统时，所有检查的总体拒收率百分比从9.9%降至8.1%，具有统计学显著降低。当医院转向全院范围的PACS系统时，拒收率进一步降至7.3%，但这一变化无统计学显著性。根据所使用影像总数的估计，胶片的拒收率百分比为6.6%，CR为5.5%，PACS为5.5%。因此，如果每张影像的辐射剂量不变，且每个身体部位检查使用相同类型的影像，从传统胶片成像转向磷光板成像有可能降低患者群体剂量。
