X-ray detector for CT scanners

Details X-ray detector for CT scanners X-ray detector for CT scanners

1988-11-23

1990-08-07

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 4, 250368, 25037011, 25037009, G01T 124

Patent

active

049474120

ABSTRACT:
Detectors (20) of a CT scanner (10) have a radiation receiving face (34) which is larger than a photosensitive face (30) of a photodiode (22). Lead wires (28) connect the ends of the diode photosensitive surface to terminals (26). A scintillation crystal (32) has an overhanging portion (38) which overhangs at least the interconnection between the lead wires and the photosensitive face to protect the adjoining areas of the photosensitive face from incident radiation. This enables the radiation receiving surface to be larger than the photosensitive surface. The crystal is either undercut to define the overhanging area or a section of light pipe (60) is provided between the photosensitive surface and the crystal. Increasing the radiation receiving face decreases rotor ripple artifacts. Decreasing the photosensitive face area decreases diode capacitance and increases resistance which improves amplifier performance.

REFERENCES:
patent: 3940626 (1976-02-01), Hounsfield
patent: 4110621 (1978-08-01), Horn
patent: 4145610 (1979-03-01), Perilhou
patent: 4180737 (1979-12-01), Kingsley
patent: 4607164 (1986-08-01), Kubota et al.
patent: 4621194 (1986-11-01), Yoshida et al.

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