Johnson G A, Ravin C E
Radiology. 1981 Feb;138(2):461-4. doi: 10.1148/radiology.138.2.7455131.
This paper analyzes the contribution to scattered radiation at the film plane by individual components of a conventional wall-mounted cassette holder. With grid technique, scatter from the front panel of the cassette holder is effectively reduced, but considerable scatter reaches the film plane from the automatic exposure control pickup interposed between the grid and the film cassette. With air-gap technique (grid removed), the front panel of the cassette holder and the automatic exposure control pickup contribute equally to increased scattered radiation at the film plane. The contribution to the total scatter from the air-gap positioning plate is less significant.
本文分析了传统壁挂式暗盒架各组件对胶片平面散射辐射的贡献。采用格栅技术时，暗盒架前面板的散射可有效减少，但大量散射仍会从置于格栅与暗盒之间的自动曝光控制传感器到达胶片平面。采用空气间隙技术（移除格栅）时，暗盒架前面板和自动曝光控制传感器对胶片平面散射辐射增加的贡献相同。空气间隙定位板对总散射的贡献较小。
