X-ray computed tomography apparatus, and photon counting method
A technology of tomography and photon counting, which is applied to the control of measuring devices, computerized tomography scanners, and radiological diagnostic equipment. It can solve the problems of electrical signal superposition, failure to obtain energy integral values, and weak output signals.
Active Publication Date: 2015-09-23
TOSHIBA MEDICAL SYST CORP
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Problems solved by technology
However, during the luminescence time of the scintillator (typically 40×10 -9 s or so), due to the occurrence of incident events based on other X-ray photons, there is a problem of superposition of the output electrical signal
In addition, when the next X-ray photon is incident during charging of the photodetector, the output signal becomes weaker than that based on the incident of a single X-ray photon, and as a result, there is a problem that an appropriate energy integral value cannot be obtained
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[0016] Embodiments of a photon counting X-ray computed tomography apparatus (Computed Tomography) will be described with reference to the drawings. In addition, in the following description, the same code|symbol is attached|subjected to the component which has substantially the same function and a structure, and it repeats description only when necessary.
[0017] figure 1 It is a configuration diagram showing an example of the configuration of the X-ray computed tomography apparatus according to the present embodiment. The X-ray computed tomography apparatus 1 has a high voltage generating unit 10 , a gantry 12 , a data storage unit 14 , a reconstruction unit 16 , a display unit 18 , an input unit 20 , and a control unit 22 .
[0018] The high voltage generator 10 has a high voltage power supply and a filament current generator which are not shown. The high-voltage power supply applies a high voltage between the anode target and the cathode filament of the X-ray tube 101 . ...
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An X-ray computed tomography apparatus (1) according to an embodiment of the present invention is provided with: an X-ray generation unit for generating X-rays; an X-ray detection unit (103) provided with a scintillator and a photo-detection element (104); a peak-value detection unit (120) which detects, on the basis of an output signal from the photo-detection element (104), a plurality of peak values corresponding respectively to a plurality of X-ray photons incident on the scintillator; a characteristics determination unit (124) which determines, on the basis of the plurality of peak values and times at which each of the plurality of peak values was detected, output reduction characteristics of the photo-detection element and attenuation characteristics of scintillation light caused by each of the plurality of X-ray photons; a peak-value correction unit (126) which corrects the plurality of detected peak values in accordance with the attenuation characteristics and the output reduction characteristics; a counter (130) which counts the number of X-ray photons corresponding respectively to the plurality of corrected peak values; and a reconfiguration unit (16) which reconfigures a medical image on the basis of an output from the counter (130).
Description
technical field [0001] Embodiments of the present invention relate to an X-ray computed tomography apparatus having a counter and a photon counting method. Background technique [0002] There is an X-ray computed tomography apparatus (Computed Tomography: hereinafter referred to as a photon counting X-ray CT apparatus) that reconstructs an image of a subject from the number of photons of X-rays output from an X-ray detector. In addition, a high count rate (ratio of the number of detected photons to the number of incident photons toward the X-ray detector) is required as performance of the X-ray detector of the photon counting X-ray CT apparatus. The so-called high count rate is, for example, every 1mm 2 for 10 6 about a count rate. For example, semiconductor detectors such as CZT (CdZnTe: cadmium zinc telluride) and CdTe (cadmium telluride) have been trial-produced as X-ray detectors. In order to obtain a high count rate of the semiconductor detector, efforts have been m...
Claims
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IPC IPC(8): A61B6/03
CPCG01T1/171A61B6/0407A61B6/4241A61B6/032A61B6/54A61B6/5205G01T1/20184G01T1/18
Inventor 敕使川原学
Owner TOSHIBA MEDICAL SYST CORP