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A pet time calibration method

A technology of time calibration and time distribution, which is applied in the direction of instruments, radiation measurement, measuring devices, etc., can solve problems such as differences, achieve the improvement of time resolution index, the effect of significant improvement, and the effect of improving time resolution and image quality

Active Publication Date: 2022-06-07
ZHONGSHAN MINFOUND MEDICAL EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to solve the problem that there is a large difference between the time information of the pulse signal identified by a single fixed threshold and the actual moment when the gamma photon hits the scintillator

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  • A pet time calibration method
  • A pet time calibration method

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Embodiment 1

[0049] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described with reference to the accompanying drawings and embodiments.

[0050] The time calibration method of the TOF-PET system in this embodiment is realized by a method of dual threshold comparators based on dynamic thresholds.

[0051] The PET system has a total of 38 modules, such as figure 2 shown; each module has 24 blocks, such as image 3 As shown, there are 912 blocks in total; each block consists of 8×8 SiPMs, 8×8 crystals and 8×8 electronic channels, such as Figure 4 shown, a total of 58368 channels.

[0052] Define i as the number of channels in the block, and j as the number of blocks in the PET detector system.

[0053] The specific implementation steps are as follows, such as figure 1 shown:

[0054] (1) Obtain the gain value of each detection channel of the TOF-PET system, including the following steps:

[00...

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Abstract

The invention discloses a PET time calibration method, which relates to the technical field of medical imaging equipment. A dual-threshold comparator based on a dynamic threshold realizes time signal discrimination, including a high-threshold comparator and a dynamic low-threshold comparator, and a high-threshold comparator. The energy reference voltage is calibrated for each detection channel, and the low-threshold comparator calibrates the time reference voltage for each detection channel. The energy reference voltage of each detection channel is calibrated with a high threshold, and the gain proportional relationship of each channel is obtained. The time histogram of each channel is counted based on an external source, and the time resolution of each channel is obtained by stepping and iterative methods, and the time of each channel is calculated. The threshold with the optimal resolution is used as the optimal low threshold of the channel, and finally realizes the precise calibration of the time of each detection channel, thereby achieving the purpose of improving the time resolution and image quality of the TOF-PET system.

Description

technical field [0001] The invention relates to the technical field of medical imaging equipment, in particular to a PET time calibration method. Background technique [0002] Positron Emission Computed Tomography (PET) is one of the most advanced medical diagnostic equipments. It works by injecting an isotope-labeled drug into the body, and the radionuclide releases a positron, which quickly annihilates the negative electron in the body and produces two gamma photons with the same energy and opposite directions. [0003] By using a nuclear detector device around the human body, the PET system can obtain the time, position and energy information of the photon detected by the detector, and reconstruct the image according to the information. Commonly used nuclear detectors include crystal arrays composed of multiple scintillation crystals and photodetectors. Among them, the crystal array is used to receive the photons (such as gamma photons) released by the patient and conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T7/00G01T1/29
CPCG01T7/005G01T1/2985
Inventor 吴国城叶宏伟钱华黄振强
Owner ZHONGSHAN MINFOUND MEDICAL EQUIP CO LTD