Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1996-10-16
1998-02-17
Wong, Don
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
250214VT, 378 988, G01J 124
Patent
active
057194017
ABSTRACT:
A position-sensitive electromagnetic radiation detector for measuring the position and energy of high energy electromagnetic radiation emitted from a high energy electromagnetic radiation source. The detector may also be used for measuring the position and energy of high energy electromagnetic radiation emitted from a radioactive material administered to a patient in a medical diagnostic imaging system to produce an image of the patient. The electromagnetic radiation includes X-ray and Gamma ray radiation. The electromagnetic radiation detector includes the combination of a cadmium zinc telluride (CdZnTe) crystal to absorb the incident radiation (incident photons) and directly convert the incident photons into electrons and a micro-channel plate (MCP) to collect and multiply these electrons. The CdZnTe crystal and MCP may be further combined with activation means activating the CdZnTe crystal to facilitate the liberation of electrons from the crystal, readout means coupled to MCP for reading the current produced by the electrons multiplied by the MCP, and means for accelerating electrons so produced and multiplied from one component of the invention toward the other. The transfer of electrons from one component of the invention to the other may also be facilitated by enclosing the electromagnetic radiation detector in a vacuum envelop. The present invention provides a better position and energy resolution detector that can be coupled with a larger range of fast and simple readout devices. This improves significantly the diagnostic power of the presently used Positron Emission Tomography (PET) and Single Photon Emission Computed Tomography (SPECT) systems, and greatly extends the field of their application both in medical diagnosis and research.
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Chaney Roy C.
Hammack Hilton D.
Board of Regents , The University of Texas System
Wong Don
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