Wieder S, Adams P L
AJR Am J Roentgenol. 1981 Oct;137(4):695-8. doi: 10.2214/ajr.137.4.695.
Use of the aluminum trough filter for phototimed posteroanterior chest radiographs at 120 kVp provides excellent detail within the parenchyma of the lung as well as greatly enhanced visualization of mediastinal structures on a single exposure. An improvement in overall diagnostic value was noted by a panel of radiologists in 87% of 50 cases compared with conventional 120 kVp technique. Dosimetric measurements of the entrance exposure indicate a 12.5% reduction over the mediastinum and a 62% reduction over the lateral lung field compared with routine nonfilter examinations. The filter is inexpensive and readily adapted to any x-ray unit and is, therefore, an attractive alternative to costly high kVp sources. Furthermore, the attenuation coefficient for calcium in bone and parenchyma remains relatively high with preservation of calcium contrast. Repeat exposures have been minimized and the need for additional projections virtually eliminated.
在120千伏峰值电压下，将铝槽滤线器用于光定时后前位胸部X光片拍摄，能在肺部实质内提供出色的细节，并且在单次曝光时大大增强纵隔结构的可视性。与传统的120千伏峰值电压技术相比，一组放射科医生在50例病例中的87% 注意到总体诊断价值有所提高。入口曝光量的剂量测量表明，与常规无滤线器检查相比，纵隔部位减少了12.5%，侧肺野减少了62%。该滤线器价格低廉，易于适配任何X光设备，因此，对于昂贵的高千伏峰值电压源来说是一个有吸引力的替代方案。此外，骨骼和实质中钙的衰减系数仍然相对较高，同时保留了钙对比度。重复曝光已减至最少，几乎不再需要额外的投照。
