Method for operation of a counting radiation detector with improved linearity

A radiation detector and detector technology, which are applied in the field of X-ray devices and counting X-ray detectors, can solve the problems that the linearity conditions of CT photography cannot be met, and the image quality cannot meet the requirements.

Inactive Publication Date: 2005-06-15
SIEMENS AG
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Problems solved by technology

However, the X-ray quantum is incident on the detector element in the X-ray computed tomography apparatus. It is precisely at this high rate that the dead time of the detector element causes the linearity condition of CT imaging to be unsatisfied, so the image quality cannot adapt Require

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  • Method for operation of a counting radiation detector with improved linearity
  • Method for operation of a counting radiation detector with improved linearity
  • Method for operation of a counting radiation detector with improved linearity

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Embodiment Construction

[0031] figure 1 A section of an x-ray CT system with a counting x-ray detector (eg based on CZT or CdZnTe) and a correction unit 10 is schematically shown, in which the method according to the invention is implemented. The figure shows the support of a CT system 1 with a rotating part 3 and a fixed part 2 . The x-ray tube unit 6 and the detector unit 4 lying opposite it can be seen in the rotating part 3 . The X-ray tube unit 6 includes an X-ray tube, a collimator, focus control means and means for anode rotation. The detector unit 4 comprises a counting X-ray detector with a single detector module 5 and is connected to a measurement and analysis unit 10 which in this example comprises an FPGA. Furthermore, on the rotating part 3 of the cradle there are provided a main controller 7 for this rotating part (which may also include a dose modulator), a power supply 9 with a high-frequency transmitter, and a power supply for the X-ray tube unit. 6 voltage sources. Each control ...

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Abstract

The invention relates to a method for operating a counting radiation detector, in particular a counting X-ray detector, with improved linearity, during operation each detector element (14) of the radiation detector (4) is counted depending on providing counting pulses at the counting rate of the number of ray quantum numbers occurring per time unit; converting the counting rate provided by each detector element (14) or part of the detector element (14) into an actual counting rate through a functional relationship, or Multiply by a correction factor that depends on the magnitude of the count rate. Correction coefficients are determined in advance for each detector element (14) or a subsection thereof for the calculation of the count rate due to the dead time of the detector element (14) to the actual number of radiation quanta present per time unit The deviation is corrected. The method of the invention improves the linearity of the counting radiation detector especially under high radiation intensity, and can also meet the linearity condition in X-ray CT equipment.

Description

technical field [0001] The invention relates to a method for operating a counting radiation detector, in particular a counting X-ray detector, with improved linearity, wherein during operation each detector element of the counting radiation detector provides an A count pulse for the count rate of the number of ray quanta that occur per unit of time. The invention also relates to a counting radiation detector and to an x-ray system having a counting radiation detector operated according to the method. Background technique [0002] The method is primarily suitable for counting x-ray detectors, for example for future application in x-ray computed tomography (CT). However, an application is of course also possible to other counting radiation detectors in which insufficient linearity is a problem due to the influence of the dead time of the detector when the number of accumulated radiation quanta per time unit is high. [0003] Examinations with the aid of computed tomography s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/17A61B6/00A61B6/03G21K1/12
CPCA61B6/032A61B6/583A61B6/585G01T1/171
Inventor 比约恩·海斯曼西尔克·詹森托马斯·冯德哈尔
Owner SIEMENS AG
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