Apparatus for measuring density or the like of an object having

Details Apparatus for measuring density or the like of an object having Apparatus for measuring density or the like of an object having

1989-02-16

1990-08-14

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Absorption

250369, G01B 1502

Patent

active

049493655

ABSTRACT:
An apparatus for measuring the density or the like of an object from the level of transmission through the object of gamma rays having different energy levels which are transmitted at the object by a gamma source having a predetermined solid angle of transmission. A collimator collimates gamma transmitted through the object and a scintillator generates light corresponding to the output of the collimator. Plural photomultipliers generate position-dependent electrical signals corresponding to the light generated by an incident gamma ray photon to the scintillator. A calculating circuit generates a density spectrum for the object from the position-dependent electrical signals by integrating the position-dependent electrical signals corresponding to each of the incident gamma ray photons to the scintillator.

REFERENCES:
patent: 3373286 (1964-09-01), Han
patent: 3997794 (1976-12-01), York et al.
patent: 4136283 (1979-01-01), Blum
patent: 4197460 (1980-04-01), Anger
patent: 4455616 (1984-06-01), Inbar
patent: 4672542 (1987-06-01), Roux et al.
Le Blanc et al., "High Resolution Bone Mineral Densotometry with a Gamma Camera", Phys. Med. Biol., 1984, vol. 29, No. 1, 25-30.
Tomomitsu et al., "Dual Photon Absorptiometry", 5/23/86.

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