Spinning filter for X-ray apparatus

Details Spinning filter for X-ray apparatus Spinning filter for X-ray apparatus

1981-02-27

1983-08-16

Church, Craig E.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378157, G21K 300

Patent

active

043995500

ABSTRACT:
Curved X-ray filter elements are arranged circularly around a drum. Alternate circumferentially adjacent elements have different filtration properties. Diametrically opposite elements have the same properties. An X-ray source provides a sequence of alternate low and high energy X-ray beam pulses. A multicell X-ray detector produces X-ray attenuation data for each pulse and the data is switched to alternate memories. A drum drive motor is energized at power line frequency. A pinion on the motor shaft turns a gear. A lug that is mounted for angular adjustment on the gear drives the drum. A multiple blade shutter is also mounted on the gear for angular adjustment and rotation with the gear. The shutter alternately interrupts and restores a light beam to a photosensitive device which produces corresponding signal state changes or trigger signals. The signals are used to synchronize the low and high energy X-ray pulses, the filter element angular locations and memory switching with power line frequency.

REFERENCES:
patent: 4029963 (1977-06-01), Alvarez
patent: 4277685 (1981-07-01), Covic

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