X-ray or gamma ray systems or devices – Beam control – Collimator
Patent
1998-10-05
2000-05-09
Church, Craig E.
X-ray or gamma ray systems or devices
Beam control
Collimator
378150, 378151, 378156, 378159, G21K 102
Patent
active
060614269
ABSTRACT:
An X-ray examination apparatus includes an X-ray source (1) for emitting X-rays. An object to be radiologically examined is arranged in an examination space. An X-ray detector (2) derives an image signal, for example an electronic video signal, from an X-ray image of the object. An X-ray filter locally attenuates the X-rays partly. The X-ray filter is arranged between the X-ray source and the X-ray detector and the X-ray filter is provided with filter elements whose X-ray absorptivity can be adjusted on the basis of an amount of X-ray absorbing liquid present within the individual filter elements.
The X-ray examination apparatus includes an X-ray collimator for locally intercepting the X-rays. The X-ray collimator is arranged between the X-ray source and the examination space and is provided with collimator elements which can be switched between an X-ray transmitting state and an X-ray intercepting state. Individual collimator elements are filled with an X-ray intercepting liquid in the X-ray intercepting state.
The amount of X-ray absorbing liquid present in the filter elements is controlled by application of an electric voltage to the relevant filter elements. The collimator elements are switched between the X-ray intercepting state and the X-ray transmitting state by means of an electric voltage which is applied to the relevant collimator elements.
REFERENCES:
patent: 3805081 (1974-04-01), Barthel et al.
Fokkink Lambertus G. J.
Linders Petrus W. J.
Stegehuis Herman
Welters Wilhelmus J. J.
Willard Nicolaas P.
Church Craig E.
Renfrew, Jr. Dwight H.
U.S. Philips Corporation
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