Effect of reduced scatter on radiographic information content and patient exposure: A quantitative demonstration

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Abstract
A reduced exposure with a superior scatter removal device may be used to record the same image information as a normal screen film exposure using a conventional grid. This theoretical conclusion is not readily demonstrated because of the limited visibility on the underexposed film. Radiographs underexposed by a factor of 3 with a scanning multiple slit assembly (SMSA) were enhanced autoradiographically and found visually to contain more information than properly exposed radiographs obtained under similar conditions using a conventional Bucky grid. This observation was confirmed by contrast scale and noise measurements. The entrance skin exposure of the radiograph using the SMSA was 45% of that required with the grid technique at the same beam quality.