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Filters for filtering x-rays and x-ray computed tomography

A tomographic imaging and X-ray technology, applied in the field of X-ray computed tomography, can solve the problem of low dose efficiency

Inactive Publication Date: 2017-03-01
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

from figure 2 Obviously, the smaller the weight Q is selected, the lower the dose efficiency

Method used

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  • Filters for filtering x-rays and x-ray computed tomography
  • Filters for filtering x-rays and x-ray computed tomography
  • Filters for filtering x-rays and x-ray computed tomography

Examples

Experimental program
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Effect test

Embodiment Construction

[0036] exist image 3 The X-ray computed tomography imager 1 shown in includes a gantry 2 with a stationary part 3 and a part 4 rotatable about a system axis or z-axis 5 . In the case of this exemplary embodiment of the invention, the rotatable part 4 has an x-ray system comprising an x-ray device 6 and an x-ray detector 7 arranged opposite one another on the rotatable part 4 . During operation of the x-ray computed tomography imager 1 , x-rays 8 are emitted from the x-ray system 6 in the direction of the x-ray detector 7 , which pass through the measurement object and are detected by the x-ray detector 7 as detector signals Or collect in the form of measurement data.

[0037] exist Figure 4 The X-ray detector 7 shown in plan view has a plurality of detector elements 24 arranged in detector rows 25, 26, 27 and detector columns 28, 29, wherein the detector columns run in the direction of the z-axis and detect The device row runs in the φ direction and thus perpendicularly t...

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PUM

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Abstract

The invention relates to a filter (15) for filtering X-rays (8) emitted from an X-ray source (16), which X-rays (8) are detected using an X-ray detector (7), said The detector (7) has detector elements (24) arranged in detector rows (25, 26, 27) and detector columns (28, 29), the detector signals of said detector elements (24) passing through The image of the object (P) is reconstructed such that the detector signals from the detector rows (26, 27) located further outside with respect to the central detector row (25) are weighted downwards, where the filter (15) is constructed such that the X-rays (8) are absorbed or attenuated by the filter (15) depending on the weighting of the detector signals during reconstruction or depending on the weighting function used during reconstruction. The invention also relates to an X-ray computed tomograph (1) having such a filter (15).

Description

technical field [0001] The invention relates to a filter for filtering X-rays emitted from an X-ray source, the X-rays being detected using an X-ray detector. Furthermore, the invention relates to an X-ray computed tomography apparatus having such a filter. Background technique [0002] An x-ray device, in particular an x-ray computed tomography system that simultaneously records measurement data on several body layers of a patient, each has an x-ray detector for this purpose with a plurality of detector elements detector row. Typically, the x-ray detectors of such multislice x-ray computed tomography machines extend between 4 cm and 16 cm in the direction of the system axis or z-axis of the x-ray computed tomography machine. In third-generation X-ray computed tomography imagers, the X-ray detector is arranged on the rotatable part of the gantry of the X-ray computed tomography imager opposite the X-ray source from which the X-ray source is usually conical in the X-rays a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21K3/00A61B6/00
CPCA61B6/4035G21K1/10
Inventor 斯蒂芬·卡普勒
Owner SIEMENS AG