X-ray examination apparatus comprising a filter

Details X-ray examination apparatus comprising a filter X-ray examination apparatus comprising a filter

1995-07-03

1996-09-24

Church, Craig E.

X-ray or gamma ray systems or devices

Beam control

Filter

378156, G21K 300

Patent

active

055598536

ABSTRACT:
An X-ray examination includes a filter for limiting the dynamic range of an X-ray image formed on an X-ray detector by irradiation of an object, for example a patient to be examined, by means of X-rays. The filter has a number of electrodes and grains or powder particles containing an X-ray absorbing material and suspended in a suspension liquid. When a voltage is applied to electrodes, X-ray absorbing material in the suspension will move to the excited electrodes under the influence of electrophoresis. A distribution with a desired X-ray absorption profile is adjusted by application of a suitable voltage pattern. The electrodes may have dimensions of, for example 0.5.times.0.5 mm, enabling an X-ray absorption profile to be obtained with a high spatial resolution. The X-ray absorption profile can be changed within a brief period of time, for example within one second, by changing the voltage pattern on the electrodes.

REFERENCES:
patent: 3755672 (1973-08-01), Edholm et al.
patent: 4497062 (1985-01-01), Mistretta et al.
patent: 5242372 (1993-09-01), Carol

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