Method for energy calibrating quantum-counting x-ray detectors in a dual-source computed-tomography scanner

An X-ray and detector technology, which is used in the field of energy calibration of X-ray detectors for quantum counting, and can solve problems such as threshold shift

Active Publication Date: 2013-09-25
SIEMENS HEATHCARE GMBH
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Problems solved by technology

However, since the detector (sensor material or detector element and signal processing electronics or ASIC) takes another operating point under irradiated

Method used

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  • Method for energy calibrating quantum-counting x-ray detectors in a dual-source computed-tomography scanner
  • Method for energy calibrating quantum-counting x-ray detectors in a dual-source computed-tomography scanner
  • Method for energy calibrating quantum-counting x-ray detectors in a dual-source computed-tomography scanner

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Embodiment Construction

[0020] figure 1 Components of a dual-source computed tomography system with a suitably positioned target 6 for carrying out the proposed method are shown highly diagrammatically. In the drawing two X-ray systems A, B consisting of A-X-ray tube 1 and A-X-ray detector 2 and B-X-ray tube 3 and B-X-ray detector 4 can be recognized, which are arranged in the frame of the computed tomography system 5 on. Here, the two x-ray systems are arranged at an angle of 90° relative to each other in the direction of rotation of the gantry, such as from figure 1 as known from. The direction of rack rotation is indicated by a curved arrow.

[0021]In the present example, for the energy calibration of the A-X-ray detector 2 , the fluorescent target 6 is arranged in the X-ray beam 8 of the B-X-ray tube 3 in such a way that it is uniformly irradiated and hit by the resulting X-ray fluorescent radiation 9 A-X-ray detector 2 to be calibrated. In this case, the A-X-ray detector 2 is calibrated by...

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Abstract

A method is disclosed for energy calibrating quantum-counting x-ray detectors in an x-ray installation. A target (6), for producing x-ray fluorescence radiation, is positioned between the first x-ray source (1) and first x-ray detector (2) and irradiated with x-radiation of the first x-ray source (1) in such a way that x-ray fluorescence radiation which strikes the second x-ray detector (4) from the target (6) is produced by the x-radiation of the first x-ray source (1). The second x-ray detector (4) is then energy calibrated by way of the x-ray fluorescence radiation of the target (6). The first x-ray detector (2) can be energy calibrated in the same way with the aid of the x-radiation of the second x-ray source (3). With the proposed method, the x-ray detectors of a dual-source CT x-ray installation can be calibrated with little expenditure under conditions close to those of the system.

Description

technical field [0001] The invention relates to a method for energy calibration of a quantum-counted X-ray detector in an X-ray system having at least two X-ray systems rotatable about a center of rotation, the X-ray systems being They are arranged with an angle offset from each other in the direction of rotation. Such x-ray systems are used in the field of computed tomography (CT) and are also known in design as dual-source computed tomography systems or dual-source C-arm x-ray systems. The invention also relates to a target for generating X-ray fluorescence radiation, which is suitable for carrying out the method. Background technique [0002] Quantum-counting X-ray detectors, also called photon-counting X-ray detectors, generally have an arrangement of detector elements (pixels) composed of a direct-conversion semiconductor material. The detected photons generate a charge pulse in the respective detector element, which is converted by the detector electronics into a mea...

Claims

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Application Information

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IPC IPC(8): G01T1/24
CPCG01T1/2985G01T7/005
Inventor M.艾肯西尔S.卡普勒E.克拉夫特B.克莱斯勒D.尼德罗纳S.沃思
Owner SIEMENS HEATHCARE GMBH
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