发明名称 |
Spinning filter for X-ray apparatus. |
摘要 |
<p>Curved x-ray filter elements are arranged circularly around a drum (40). Alternate circumferentially adjacent elements have different attenuation properties. Diametrically opposite elements have the same properties. An x-ray source (11) provides a sequence of alternate low and high energy x-ray beam pulses. A multicell x-ray detector (18) produces x-ray attenuation data for each pulse and the data is switched to alternate memories (1, 2). A drum drive motor (55) 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 (40). 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 (95). The signals are used to synchronize the low and high energy x-ray pulses, the filter elements angular locations and memory swrtching with power line frequency. </p> |
申请公布号 |
EP0059382(A1) |
申请公布日期 |
1982.09.08 |
申请号 |
EP19820101253 |
申请日期 |
1982.02.19 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
HAUCK, ROBERT BRUCE;GRAY, FLOYD LEE;BRANDT, RICHARD THORNTON |
分类号 |
G01N23/04;A61B6/00;A61B6/06;G21K1/04;G21K1/10;(IPC1-7):21K3/00;21K1/04;61B6/06 |
主分类号 |
G01N23/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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