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Detection device for detecting photons and method therefore

By using an adjustable feedback discharge unit and a control unit in the detection device to adjust the ASIC operating point of each pixel, the problems of spectral linearity and gain non-uniformity caused by transient response differences are solved, and the predefined ballistic loss is achieved Calibration improves the performance and accuracy of detection equipment.

Active Publication Date: 2016-07-13
KONINKLIJKE PHILIPS NV
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Problems solved by technology

[0008] However, traditional gain calibration ignores pixel changes caused by differences in transient response
Variations due to transient response not only cause gain differences but can affect spectral linearity

Method used

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  • Detection device for detecting photons and method therefore
  • Detection device for detecting photons and method therefore
  • Detection device for detecting photons and method therefore

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Embodiment Construction

[0040] figure 1 An embodiment of a projection data generation system 20 for generating projection data of an object is shown schematically and exemplarily. In this embodiment, the projection data generating system is a computed tomography system. The computed tomography system 20 comprises a gantry 1, i.e. a rotor, capable of rotating about an axis R about a stator (in figure 1 not shown in ), the axis of rotation R extends parallel to the z-direction. In this embodiment, the radiation source 2 is an X-ray tube, mounted on the gantry 1 . The radiation source 2 is provided with a collimator 3 which, in this embodiment, forms a conical radiation beam 4 from the radiation generated by the radiation source 2 . The radiation penetrates an object (not shown), such as a patient, in the examination region 5 . After having traversed the examination region 5 , the radiation beam 4 is incident on a detector 6 mounted on the gantry 1 .

[0041] The detector 6 is adapted to generate d...

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Abstract

The present invention relates to a detection device (6) for detecting photons emitted by a radiation source (2) and capable of adjusting ballistic deficit. The detection device (6) comprises a pre-amplifying unit (11) (such as, e.g., a charge-sensitive amplifier), a shaping unit (60) comprising a feedback discharge unit (13, I) (such as, e.g., a feedback resistor or a feedback current source), and a feedback discharge control unit (50) coupled to the feedback discharge unit (13, I). The feedback discharge control unit (50) is adapted to, e.g., adjust a resistance of a feedback resistor (and / or to adjust the current value of the feedback current source) if an electrical pulse generated by the shaping unit (60) does not exceed at least one energy comparison value (X1, X2,..., XN). The feedback discharge control unit (50) is adapted to not adjust the parameter of the feedback discharge unit (13, I) if the electrical pulse exceeds the at least one energy comparison value (X1, X2,..., XN). By tuning the feedback resistor operating point (or the feedback current source operating point), the ballistic deficit can be adjusted to a predefined expected value.

Description

technical field [0001] The present invention relates to a detection device for detecting photons emitted by a radiation source and capable of adjusting ballistic deficit, to a system comprising a detection device and a radiation source radiating photons of predetermined energy and capable of adjusting ballistic deficit, to a system with A detection method for detecting photons emitted by a radiation source and capable of adjusting ballistic deficits, and relates to a calibration method capable of adjusting ballistic deficits. Background technique [0002] Photon counting based spectroscopic computed tomography (CT) utilizes direct conversion materials, eg, CZT. The performance of CZT pixels can vary significantly across the array. Charge generation and transient response can vary widely. These variations manifest themselves as pixel gain non-uniformities. Changes in transient response also cause differences in gain due to ballistic deficits. [0003] Today, energy calibr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/17
CPCG01T1/17G01J1/44G01J2001/444
Inventor R·斯特德曼布克C·赫尔曼
Owner KONINKLIJKE PHILIPS NV
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