CARBON GRAPHITE COMPENSATING FILTER FOR BETTER DENSITY DISTRIBUTION

Abstract

In order to improve to diagnostic Potency of bone radiograph, Carbon graphite compensating filters were made for better film density distribution. 1) The general feature and thickness of each filter were determined by simulating the film density of the object to that of the Carbon graphite step phantom radiographed on the same Voltage. 2) The mass of Carbon graphite was cut down to each component, which was pasted together on the thin plate to construct the filter for appropriate sharpe and thickness propotional to the focus-film distance and X-ray absorption. 3) This kind of filter is more useful to compensate the X-ray absorption in the case of complex shaped objects, especially uneven in the direction perpendicular to the X-ray beams. 4) Remarkable improvement of diagnostic potency was obtained using these filter in spite of the slight depression of clearness and contrast.