Radionuclide angiographic collimator system
AssigneeScinticor Incorporated
InventorRaymond P. Greiner
Life of this patent
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Abstract
A gamma ray collimator assembly for use in a cardiac inspection system. A collimator has a plurality of collimator elements with the collimator walls absorbing gamma rays. The collimator walls have a base layer of a first material covered by a layer of a second material which preferentially absorbs inelastically scattered gamma rays generated in the first material.
Claims16
A gamma ray collimator assembly in a cardiac inspection system for resolving desired gamma rays emitted from a patient and for removing inelastic scattered gamma rays, comprising:
- a plurality of collimator elements with each of said collimator elements having walls, each of said walls absorbing said inelastic scattered gamma rays and said walls of each said collimator element defining an elongated longitudinal passageway comprised of a first material covered by a layer of a second material, said second material having a large absorption coefficient for said inelastically scattered gamma rays generated in said first material responsive to said gamma rays emitted from said patient.
A method of collimating radionuclide gamma radiation, comprising steps of:
- selecting a particular gamma ray radiation of energy E.sub.o for collimation, said gamma ray radiation being output from a specimen of interest;
- positioning a detector of said gamma ray radiation in a location useful for gathering information about said specimen and associated with said gamma ray radiation;
- and
- using a collimator with each collimator element having a longitudinal passageway and layered wall structure including at least a first and second layer wherein divergent portions of said gamma ray radiation of energy E.sub.o are strongly absorbed by said second layer of said layered wall structure, the absorption of said gamma ray radiation giving rise to inelastic scattered X-ray radiation of energy less then E.sub.o and said first layer having a large absorption coefficient for said inelastic scattered X-ray radiation with said second layer allowing passage of said inelastic scattered X-ray radiation.
A method of constructing a gamma ray collimator, comprising steps of:
- assembling a plurality of base lead collimator elements;
- and
- disposing a thin layer of tin on said collimator elements, said layer of tin absorbing inelastic scattered x-rays arising from gamma rays striking said base lead collimator elements.
A collimator assembly in an angiographic inspection system for resolving desired energy radiation emitted from a patient and for removing inelastic scattered radiation, comprising:
- a plurality of collimator elements forming said collimator assembly with each of said collimator elements having walls, and each of said walls of each collimator element absorbing some of said desired energy radiation entering said walls and said walls giving rise to emission of said inelastic scattered radiation having energy less than said desired energy radiation;
- and
- said walls further defining an elongated longitudinal passageway for each of said collimator elements and said walls comprised of a first material covered by a layer of a second material, said second material having a large absorption coefficient for said inelastically scattered radiation emitted from said first material responsive to said desired energy radiation being absorbed by said walls.
Dependencies are inferred from the claim text.