Bone densitometer

Abstract From the Canadian patent

Abstract of Disclosure In an x-ray bone densitometer, special calibration techniques are employed to accomodate variations. In one aspect, a bone-like calibration material is interposed and the system determines the calibration data from rays passing only through flesh. In another aspect a rotating device carries the, calibration material through the beam. The specific densitometer shown uses an x-ray tube operated at two different voltages to generate a pencil beam the energy, levels of the x-ray photons being a function of the voltage applied. An integrating detector is timed to integrate the detected signal of the patient-attenuated beam over each pulse, the signals are converted to …