Bone densitometer

A raster scan x-ray bone densitometer. The 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 pati...

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Bibliographic Details
Main Author STEIN; JAY A
Format Patent
LanguageEnglish
Published 07.08.1990
Subjects
DETECTING MASSES OR OBJECTS
DIAGNOSIS
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
HUMAN NECESSITIES
HYGIENE
IDENTIFICATION
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
MEDICAL OR VETERINARY SCIENCE
PHYSICS
SURGERY
TESTING
X-RAY TECHNIQUE
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Summary:A raster scan x-ray bone densitometer. The 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 digital values and a digital computer converts the set of values produced by the raster scan into a representation of the bone density of the patient. Multiple reference detectors with differing absorbers are used by the system to continuously correct for variation in voltage and current of the x-ray tube. Calibration is accomplished by the digital computer on the basis of known bone-representing substance being carried repeatedly through the pencil beam so that a set of detected signals affected by the calibration substance is compared by the computer with a set of detected signals unaffected by the calibration material.
Bibliography:Application Number: US19860885098