Lewentat G, Bohndorf K
Klinik für Diagnostische Radiologie und Neuroradiologie, Zentralklinikum Augsburg.
Rofo. 1997 May;166(5):376-81. doi: 10.1055/s-2007-1015445.
Analysis of reject films from a large radiological department under the following aspects: How big is the waste of films? Where are the sources of error? What are the possible means of quality assurance?
During a total period of 9 months, separated into three quarters, 14,570 reject films were analysed and assigned to 4 categories ("positioning", "exposure", "reject films due to patients" and "others"). In addition they were classified according to the respective parts of the body. The influence of a "study effect" was quantified by the analysis before and after information of staff.
The reject film rate in relation to all performed x-rays, was 9.0-13.2% of all the films taken during that period: of these, the failure rate (x-rays useless for diagnosis because of their bad quality) was between 54.2 and 57.5%. In this category, the main sources of error were positioning (55%) and exposure (34%). Surprisingly, the technical film waste amounted to 42.5-45.8% (not developed or preexposed films, x-rays of phantoms etc.).
Wasted films due to errors occurring during taking, as well as technical film waste, are unavoidable. Their proportion in relation to the total number of films should not exceed 8%. The main approach to reducing cost must be to cut down technical film waste.
从以下几个方面分析一家大型放射科的废片情况：胶片浪费有多大？误差来源在哪里？可能的质量保证手段有哪些？
在为期9个月（分为三个季度）的时间里，对14570张废片进行了分析，并将其分为4类（“定位”、“曝光”、“患者原因导致的废片”和“其他”）。此外，还根据身体的各个部位进行了分类。通过对工作人员进行信息告知前后的分析，对“学习效应”的影响进行了量化。
相对于所有进行的x光检查，废片率占该时期所拍摄所有胶片的9.0 - 13.2%：其中，故障率（因质量差而无法用于诊断的x光片）在54.2%至57.5%之间。在这一类别中，主要误差来源是定位（55%）和曝光（34%）。令人惊讶的是，技术胶片浪费达42.5 - 45.8%（未冲洗或预曝光的胶片、模体的x光片等）。
拍摄过程中出现的误差导致的废片以及技术胶片浪费是不可避免的。它们在胶片总数中的比例不应超过8%。降低成本的主要方法必须是减少技术胶片浪费。
