X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1997-02-28
1998-12-01
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Collimator
378206, G21K 104
Patent
active
058449620
ABSTRACT:
The invention relates to an X-ray examination apparatus, including an X-ray source (3, 4) for generating X-rays and a diaphragm unit (5) which is connected to the X-ray source (3, 4) and includes shutters (6) which can be adjusted by a drive device (11, 12) so as to limit the radiation beam (100, 200) emanating from a first source (1) or from a second source (2), and a control unit (13) which controls the drive device. Correspondence between the radiation fields emanating from both sources can be achieved also in the case of different sizes of the sources; the control unit (13) then controls the drive device (11, 12) in such a manner that the shutters occupy a first position (h.sub.1) when limiting the radiation beam (101) from the first source (1) and a second position (h.sub.2) when limiting the radiation beam (200) from the second source (2), the first and the second position being such that the respective radiation fields of the first and the second source, as defined by the shutters, have equal size (H).
REFERENCES:
patent: 4464778 (1984-08-01), Goldmann
patent: 4502147 (1985-02-01), Michaels
patent: 4766603 (1988-08-01), Okabe et al.
Church Craig E.
Renfrew, Jr. Dwight H.
U.S. Philips Corporation
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