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Readout circuit and detector of a pet detector

A readout circuit and detector technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of decreased timing resolution, increased dark noise, and reduced signal-to-noise ratio of time signals, so as to reduce the number of amplifiers and reduce the number of , the effect of reducing electronic noise

Active Publication Date: 2021-08-31
JIANGSU SINOGRAM MEDICAL TECH CO LTD
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  • Application Information

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Problems solved by technology

However, the dark noise of SiPM also increases exponentially during the parallel connection of a large number of signals. These noises reduce the signal-to-noise ratio of the time signal, and the timing resolution is greatly reduced.

Method used

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  • Readout circuit and detector of a pet detector
  • Readout circuit and detector of a pet detector
  • Readout circuit and detector of a pet detector

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Embodiment Construction

[0035] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0036] Currently, silicon photomultiplier tubes (SiPM) are being used in PET systems instead of photomultiplier tubes (PMT) due to their low operating voltage and ease of integration. The accuracy of the time information of the PET system with the time-of-flight function directly affects the signal-to-noise ratio of the image, so improving the timing resolution of the detector in the PET system plays a decisive role in improving the performance of the PET system. However, due to cost and integration limitations, it is difficult to achieve a 1:1 amplified readout of the output signal of each SiPM in the SiPM array. In order to make PET equipment using SiPM arrays better move towards industrialization and marketization, the present invention provides a readout ci...

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Abstract

The invention discloses a readout circuit of a PET detector and the detector. The readout circuit includes: a SiPM array, a forming capacitor Cs, a radio frequency amplifier and a buffer amplifier circuit; wherein, the same end of each SiPM in the SiPM array is short-circuited and outputted after the first A signal is connected to the input end of the radio frequency amplifier through the shaping capacitor Cs; after the first signal is amplified by the radio frequency amplifier, it is input to the first input end of the buffer amplifier circuit, and the buffer amplifier circuit is used to amplify the signal according to time The screening conditions are buffered, amplified and then output as a pulse signal read out by a single electronic channel. The above-mentioned readout circuit can improve the signal-to-noise ratio of the output signal of the SiPM array, reduce the number of electronic channels for time discrimination, and reduce the cost of the detector.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to a readout circuit and a detector of a PET detector. Background technique [0002] The detector of positron emission tomography system (PET) is composed of scintillation crystal and photoelectric conversion device. Traditional photoelectric conversion devices are mainly photomultiplier tubes. A photomultiplier tube is a glass vacuum tube that is bulky and therefore not easy to integrate with a circuit board. The new generation of PET systems has widely used silicon photomultiplier tubes (SiPM) instead of traditional photomultiplier tubes (PMT) as photoelectric conversion devices. Silicon photomultiplier (SiPM) is an avalanche diode array working in Geiger mode. Compared with traditional photomultiplier tubes, it can obtain greater gain at a lower operating voltage. It uses standard semiconductor manufacturing The process and packaging process determine that SiPM is ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/24G01T1/29
CPCG01T1/248G01T1/2985
Inventor 李红日吴和宇
Owner JIANGSU SINOGRAM MEDICAL TECH CO LTD
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