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photon counting detector

A detector array and controller technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problem of unacceptable time

Active Publication Date: 2017-08-29
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, the time required to perform a threshold sweep can be unacceptable, especially when performing system calibration

Method used

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Embodiment Construction

[0022] first reference image 3 , schematically shows an imaging system 300 such as a computed tomography (CT) scanner.

[0023] The imaging system 300 includes a fixed gantry 302 and a rotating gantry 304 rotatably supported by the fixed gantry 302 . Rotating gantry 304 rotates about examination region 306 about longitudinal or z-axis 308 .

[0024] A subject support 309 such as a couch supports a subject or subject in the examination area 306 . The subject support 309 can be used to position the subject or subject vertically and / or horizontally relative to the imaging system 300 before, during and / or after scanning.

[0025]A radiation source 310 , such as an x-ray tube, is supported by and rotates with rotating gantry 304 about examination region 306 about longitudinal or z-axis 308 . Radiation source 310 emits concentrated energy ionizing radiation that is collimated by a collimator or the like to generate a generally fan-shaped, wedge-shaped, or cone-shaped radiation b...

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Abstract

An imaging system (300) comprising: a detector array (314) having direct conversion detector pixels that detects radiation traversing an examination region of the imaging system and generates a signal indicative of the detected radiation; a pulse shaper ( 316 ) configured to process either a signal generated by the detector array indicative of the detected radiation, or a set of test heights having different known altitudes corresponding to different known energy levels The pulses are processed and configured to generate an output pulse having a height indicative of the energy of the processed detected radiation or the processed energy of a set of test pulses; and a threshold adjuster (330) configured to combine analyzing the height of the set of test pulses and a set of predetermined fixed thresholds, analyzing the height of the output pulses corresponding to the set of test pulses, and being configured to generate a threshold adjustment indicative of a baseline based on the results of the analysis Signal.

Description

technical field [0001] The following generally relates to photon counting detectors and is described with a particular application to computed tomography (CT); however, the following applies to other imaging modalities as well. Background technique [0002] Computed tomography (CT) scanners generally include a rotating gantry rotatably mounted to a fixed gantry. The rotating gantry supports the X-ray tube and is configured to rotate around the examination region about the longitudinal direction. The detector array is arranged opposite to the X-ray tube across the inspection area. The x-ray tube is configured to emit concentrated energy ionizing radiation that traverses the examination region (and the object or portion of the subject within it) and illuminates the detector array. A detector array includes a one-dimensional or two-dimensional array of detector pixels that detect radiation and generate a signal indicative of the radiation. Each pixel is associated with a rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/24G01T7/00
CPCG01T1/24G01T1/247G01T7/005G01T1/2985G01N23/046G01T1/17H05G1/26
Inventor R·斯特德曼布克R·P·卢赫塔C·赫尔曼
Owner KONINKLJIJKE PHILIPS NV
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