Sorenson J A, Nelson J A
Radiology. 1976 Sep;120(3):705-11. doi: 10.1148/120.3.705.
The technique of moving-slit radiography for reduction of scattered radiation was investigated using a prototype moving-slit radiographic apparatus. Slit widths of 1-2 cm, when used in conjuction with an 8: 1 grid, were found to improve radiographic contrast by a factor of 2 in studies employing physical as well as anatomic phantoms. Use of the moving-slit technique at elevated kVp's was found to provide radiographic contrast as good as or better than that obtained in conventional low-kVp full-field techniques, but with a substantial reduction of patient exposure (factor of 2-4). Considerations in the design of an optimal multislit apparatus are discussed. Excessive tube loading is shown not to be a factor in such a system.
使用一台原型移动狭缝射线照相设备研究了用于减少散射辐射的移动狭缝射线照相技术。在使用物理模型以及解剖模型的研究中发现，1 - 2厘米的狭缝宽度与8:1的格栅配合使用时，可使射线照相对比度提高2倍。发现在较高千伏峰值下使用移动狭缝技术可提供与传统低千伏全视野技术相当或更好的射线照相对比度，但可大幅减少患者的辐射剂量（减少2 - 4倍）。讨论了优化多狭缝设备设计时的注意事项。结果表明，在这样的系统中，过高的管负载不是一个问题。
