Photon counting x-ray detector and method for operating a photon counting x-ray detector
A photon counting and X-ray technology, applied in X/γ/cosmic radiation measurement, radiation measurement, and instruments for radiological diagnosis, etc., can solve distortion measurement, no longer provide high-throughput capability, and pixel dead time Improvement and other issues
Pending Publication Date: 2021-06-22
SIEMENS HEALTHCARE GMBH
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Problems solved by technology
The disadvantage of this circuit is that the dead time of the pixel is greatly increased
This exacerbates the problem of "pulse pile-up", where the signals of multiple photons overlap and also leads to distorted measurements
This no longer provides the good high-throughput capability required, for example, in computed tomography
Method used
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[0083] figure 1 An exemplary embodiment of a detector module 51 with a plurality of x-ray detectors 1 according to the invention is shown. In a preferred embodiment, the detector module 51 has a two-dimensional matrix or arrangement of a plurality of X-ray detectors 1 . The corresponding x-ray detector 1 in turn has a plurality of pixel elements 5 arranged in a matrix, so that a spatially resolved measurement can be provided.
[0084] In the example shown, each x-ray detector 1 has a conversion element 3 . The conversion element 3 can be designed as a planar direct converter, for example with CdTe, CZT, CdZnTeSe, CdTeSe, CdMnTe, InP, TlBr2, HgI2, GaAs, Si, etc. as conversion material. The upper side of the conversion element 3 has a first electrode 18 (top electrode). The lower side of the conversion element 3 has a sensor pixel electrode 16 . Sensor pixel electrode 16 is connected to pixel element 5 in evaluation unit 59 via conductive connection 69 and pixel electrode 57...
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The invention relates to an X-ray detector (1) for acquiring a photon count of an X-ray image data set of an object (39) transmitted by X-ray radiation, comprising a conversion element (3) for converting the X-ray radiation into an electrical signal and a matrix having a plurality of pixel elements (5), wherein at least a partial number of the plurality of pixel elements has a signal input (7) and at least one configurable counter (9) coupled to the signal input for signal transmission, the configurable counter (9) being configured to count a pixel count signal or to count a coincidence count signal, the pixel count signal is based on a signal directly input into each pixel element (5) of a partial number of pixel elements of the plurality of pixel elements, and the coincidence count signal is based on a signal directly input into a corresponding pixel element (9) and a signal in which a coincidence of at least one other pixel element (5) of the plurality of pixel elements occurs.
Description
technical field [0001] The invention relates to a photon-counting x-ray detector for acquiring x-ray image data sets of an object transmitted by x-ray radiation, a medical imaging device with a photon-counting x-ray detector and a system for operating Photon counting method for X-ray detectors. Background technique [0002] Photon counting X-ray detectors are used in many imaging applications. These x-ray detectors are therefore used, for example, in computed tomography in medical imaging in order to generate tomographic x-ray images of an examination region of a patient. [0003] As photon-counting x-ray detectors, in particular photon-counting direct-conversion x-ray detectors can be used. Incident X-ray radiation or photons can be converted into electrical pulses in such X-ray detectors by suitable conversion materials. CdTe, CZT, HgI2, GaAs etc. can be used as conversion material, for example. The electrical pulses are evaluated by evaluation electronics, for example...
Claims
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IPC IPC(8): G01T1/161A61B6/00
CPCG01T1/161A61B6/4241G01T1/247A61B6/032A61B6/4233G01T1/17
Inventor B·克赖斯勒E·格德雷M·胡普费尔M·彼得希尔卡
Owner SIEMENS HEALTHCARE GMBH