X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1992-04-03
1994-04-19
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378134, 378121, 378136, H01J 3506
Patent
active
053053630
ABSTRACT:
A toroidal x-ray tube (I) is supported (II) for rotation about a horizontal axis (170), translation along a vertical axis (172), and translation along a horizontal axis (174). The x-ray tube includes a toroidal housing (A), an annular anode (B), and a cathode (0) which rotates a beam of electrons around the annular anode. A plurality of parallel connected voltage sources (90.sub.1, 90.sub.2, . . . , 90.sub.n) provide a sufficiently high bias voltage between the electron source and the anode that x-rays are generated. The x-ray beam passes through a compensator crystal (62), an annular window (20), a collimator (132), through a subject received in a central bore (26) of the x-ray tube, and impacts an arc segment of radiation detectors (130). The x-ray detectors are stationarily mounted outside of the plane of the annular window (FIGS. 2 and 7), nutate into the plane of the windows opposite of the origin of the x-ray beam (FIG. 6 ), rotate in part (FIG. 9 ) or rotate in full (FIG. 8 ) Angular position monitors (58, 154) determine the angular position of the cathode assembly, hence the x-ray beam, and the angular position of the detectors in the rotating detector embodiment.
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Brunnett Carl J.
Burke James E.
Mattson Rodney A.
Miller Lester
Resnick Theodore A.
Chu Kim-Kwok
Picker International Inc.
Porta David P.
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