Rotating disk device for slit radiography of the chest.

A pair of rapidly rotating disks was assembled with multiple radial slits for obtaining chest radiographs in 1/60-1/20 sec., using automatic exposure timing, without visible images of individual slits. Substantial reduction of scattered radiation levels is achieved (one half to one fourth), especially in the retrocardiac and central mediastinal areas of the chest film. Full realization of the potential contrast improvement resulting from this degree of scatter reduction is impaired by the limited latitude of x-ray films used for radiography. These problems and potential solutions are discussed.