Beam filter, particularly for x-rays

Details Beam filter, particularly for x-rays Beam filter, particularly for x-rays

2007-11-30

2011-10-04

Thomas, Courtney (Department: 2882)

X-ray or gamma ray systems or devices

Beam control

Filter

Reexamination Certificate

active

08031840

ABSTRACT:
The invention relates to a beam filter (10) that can particularly be used in spectral CT-applications for producing a desired intensity profile of a radiation beam without changing its spectral composition. In a preferred embodiment, the beam filter (10) comprises a stack of absorbing sheets (111) that are separated by wedge-shaped spaces (112) and focused to a radiation source (1). Furthermore, the absorbing sheets have a varying width in direct ion of the radiation. Different fractions of the radiation source (1) area are therefore masked by the beam filter (10) at different points (A, B) on a detector area (2). The absorbing sheets preferably comprise a material that is highly absorbing for the radiation to be filtered.

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patent: WO 2005/087106 (2005-09-01), None

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