title: Low-cost microcomputer-based densitometer.
abstract: We have constructed low-cost equipment for the measurement of the optical density of x-ray films. This equipment is based on a video system connected via an analog to digital converter to an Apple microcomputer. The optical density of an x-ray film can thus be accessed by commands in BASIC or machine-code programs. By using a calibrated step-wedge film, we have found a stable linear response for optical densities of up to 0.8.
mesh_terms: D003201:Computers; D003720:Densitometry / Q000295:instrumentation*; D008838:Microcomputers; D014965:X-Rays