Abstract
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 conjunction 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.
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