X-ray tube target for reduced off-focal radiation

Details X-ray tube target for reduced off-focal radiation X-ray tube target for reduced off-focal radiation

1996-12-27

2000-04-18

Church, Craig E.

X-ray or gamma ray systems or devices

Source

Target

378144, H01J 3508

Patent

active

060524340

ABSTRACT:
An X-ray tube comprises an anode assembly having an associated anode and a cathode assembly for providing a focused electron beam directed to the anode. An anode target, associated with the anode assembly, accelerates the electron beam and produces X-rays upon electron impact with the anode target. Off-focal radiation tends to be most intensely emitted by the top surface of the target. In conventional X-ray tubes, the off-focal radiation as seen by the detector encompasses almost the entire top surface of the target assembly. In accordance with the present invention, the anode target comprises a cut-out top surface for reducing off-focal radiation, by blocking the off-focal radiation from the top surface from reaching the detector. Blocking the radiation produced at the top surface becomes more important as the ratio of the track area visible at the detector decreases with respect to the top surface area.

REFERENCES:
patent: 3113233 (1963-12-01), Kasten, Jr. et al.
patent: 4321471 (1982-03-01), Holland et al.
patent: 4461019 (1984-07-01), Lersmacher
patent: 4958364 (1990-09-01), Guerin et al.

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