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

A tomography, X-ray technology, applied in the field of X-ray computed tomography, can solve problems such as low dose efficiency

Inactive Publication Date: 2011-05-25
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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  • Filter for filtering x-rays and x-ray computed tomography
  • Filter for filtering x-rays and x-ray computed tomography
  • Filter 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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Abstract

The invention relates to a filter (15) for filtering X-rays emitted from an X-ray source (16), which uses an X-ray detector (7) to detect the X-rays (8); the X-ray detector (7) comprises detector elements (24) arranged as detector lines (25, 26, 27) and detector rows (28, 29); detector signals of the detector element (24) are weighted in the way that the detector signals from the outer detector lines (26, 27) in relation to the middle detector line (25) are weighted down, when an image of an object (P) through which the detector signals pass is reconstructed; the filter (15) is configured to cause the X-rays (8) to be absorbed or attenuated by the filter (15) based on the weighting of the detector signals during the reconstruction or on the weighting function used during the reconstruction. The invention further relates to an X-ray computed tomography (1) with the 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 Applications(China)
IPC IPC(8): G21K3/00A61B6/00
CPCG21K1/10A61B6/4035
Inventor 斯蒂芬·卡普勒
Owner SIEMENS AG