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Detector timing device and detector

A timing device and detector technology, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of reducing the accuracy of time detection and large-scale circuits

Active Publication Date: 2018-08-21
SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The number of channels in the timing circuit is increasing, resulting in a very large circuit size
[0006] However, only considering the simplification of the front-end electronic circuit will reduce the accuracy of time detection

Method used

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  • Detector timing device and detector
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  • Detector timing device and detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] see Figure 5 , is a schematic structural diagram of a detector timing device provided by an embodiment of the present invention.

[0079] The detector timing device includes: a preamplifier 510 , a constant ratio circuit 520 and an FPGA530 .

[0080] The preamplifier 510, constant ratio circuit 520, and FPGA530 are connected sequentially, and the output signal of the detector is received by the preamplifier 510, and the output signal is sequentially processed by the preamplifier 510, constant ratio circuit 520 and FPGA530 to obtain the output of the detector The arrival time of the signal.

[0081] The preamplifier 510 is used to convert the output signal of the detector into a non-phase differential signal and an anti-phase differential signal.

[0082] In actual implementation, the preamplifier 510 can be a single-ended-to-differential amplifier, and of course, other devices that can convert a single-channel signal to a differential signal can also be used, as long...

Embodiment 2

[0094] The timing principle of the detector will be described in detail below with reference to the accompanying drawings.

[0095] see Figure 6 , is a circuit diagram of a detector timing device provided by another embodiment of the present invention.

[0096] In this embodiment, the preamplifier 510 is a single-end-to-differential amplifier 601; the single-end-to-differential amplifier 601 is used to convert the signal output by the detector into two signals that are mutually differential. Specifically:

[0097] The first input terminal of the single-ended to differential amplifier 601 receives the output signal of the detector;

[0098] The second input terminal of the single-ended-to-differential amplifier 601 is grounded;

[0099] The first output terminal of the single-ended-to-differential amplifier 601 outputs a non-inverted differential signal +X, and the second output terminal of the preamplifier outputs an inverted differential signal -X.

[0100] In this embod...

Embodiment 3

[0149] The embodiment of the present invention also provides a detector, see Figure 10 , is the schematic diagram of the detector structure.

[0150] The detector includes a crystal 1020 and a photomultiplier tube 1030, and the above Figure 5 The detector timing device 1010 in;

[0151] Among them, the crystal 1010 is used to be hit by photons to generate visible light;

[0152] Photomultiplier tube 1020, used to sense visible light and generate photoelectron pulse signals;

[0153] The detector timing device 1030 is used to read the photoelectron pulse signal to obtain the time information of the annihilation event.

[0154] The above description is the working process of the detector in the PET system. For the specific implementation of the detector timing device, refer to the description in Embodiment 1, which will not be repeated here.

[0155] In the detector provided by the embodiment of the present invention, since the output signal of the detector is converted in...

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Abstract

The invention discloses a detector timing device and a detector. The detector timing device comprises a pre-amplifier, a constant ratio circuit and an FPGA (Field Programmable Gate Array), wherein thepre-amplifier is used for converting output signals of the detector into in-phase differential signals and reverse-phase differential signals; the constant ratio circuit is used for maintaining a constant ratio between the in-phase differential signals and the reverse-phase differential signals and sending the in-phase differential signals and revere-phase differential signals with the ratio being constant to a pair of I / O ports of the FPGA; and the FPGA is used for performing zero crossing triggering on the in-phase differential signals and the reverse-phase differential signals with the ratio being constant to obtain timing logic pulse signals, and measuring the arrival time of the timing logic pulse signals to obtain time information. The detector timing device adopts the constant ratio principle, not only improves the working efficiency, but also improves the timing accuracy of the detector. Therefore, the detector timing device realizes the balance between the timing performanceand the circuit scale of a front-end electronic circuit of the digital detector.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to a detector timing device and a detector. Background technique [0002] Positron Emission Tomography (PET) is a nuclear physics detection technique that utilizes positron decay nuclide radiopharmaceutical imaging. By detecting the 511keV energy γ-photon pairs emitted in opposite directions produced by the annihilation of electron-positrons (Annihilation), the annihilation events are reconstructed according to the line statistical projection distribution. [0003] Subsequently, the time-of-flight method (Time-Of-Flight, TOF) began to be applied to PET, which measures the time difference between the gamma photon pairs reaching the detector, and estimates the position of the annihilation event on the coincidence line according to the speed of light. [0004] The timing circuit is the basic unit used to detect time information in the front-end electronic circuit of the PET ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/24
CPCG01T1/248
Inventor 张军杨龙高鹏赵玉秋贺亮
Owner SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
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