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Shaped detector

Patent ·
OSTI ID:5843839

A radiation detector or detector array which has a non-constant spatial response, is disclosed individually and in combination with a tomographic scanner. The detector has a first dimension which is oriented parallel to the plane of the scan circle in the scanner. Along the first dimension, the detector is most responsive to radiation received along a centered segment of the dimension and less responsive to radiation received along edge segments. This non-constant spatial response can be achieved in a detector comprised of a scintillation crystal and a photoelectric transducer. The scintillation crystal in one embodiment is composed of three crystals arranged in layers, with the center crystal having the greatest light conversion efficiency. In another embodiment, the crystal is covered with a reflective substance around the center segment and a less reflective substance around the remainder. In another embodiment, an optical coupling which transmits light from adjacent the center segment with the greatest intensity couples the scintillation crystal and the photoelectric transducer. In yet another embodiment, the photoelectric transducer comprises three photodiodes, one receiving light produced adjacent the central segment and the other two receiving light produced adjacent the edge segments. The outputs of the three photodiodes are combined with a differential amplifier.

Assignee:
Technicare Corp
Patent Number(s):
US 4292538
OSTI ID:
5843839
Country of Publication:
United States
Language:
English

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Related Subjects

440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602 -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
CONTROL
DESIGN
DIAGNOSTIC TECHNIQUES
DIRECT ENERGY CONVERTERS
LUMINESCENCE
MEASURING INSTRUMENTS
NOISE POLLUTION CONTROL
PHOTOELECTRIC CELLS
POLLUTION CONTROL
RADIATION DETECTORS
SCINTILLATION COUNTERS
SCINTILLATOR-PHOTODIODE DETECTORS
TOMOGRAPHY