Title:
【発明の名称】骨の比重計
Document Type and Number:
Japanese Patent JP2721345
Kind Code:
B2
Abstract:
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.
Inventors:
SUTEIN JEI EI
Application Number:
JP50455387A
Publication Date:
March 04, 1998
Filing Date:
July 14, 1987
Export Citation:
Assignee:
HOROJITSUKU INC
International Classes:
A61B6/00; A61B10/00; G01N23/06; G01N9/24; G01N23/08; G01V5/00; H05G1/26; H05G1/46; (IPC1-7): A61B6/00; A61B6/00
Other References:
MEDICAL AND BIOLOGICAL ENGINEERING=1974
Attorney, Agent or Firm:
Kazuo Shamoto (1 person outside)