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A method to improve the signal-to-noise ratio of pet

A technology with signal-to-noise ratio and high threshold value, which is applied in the fields of radiological diagnosis instruments, medical science, diagnosis, etc., which can solve the problems of affecting system performance, wasting time, and low accuracy, so as to improve the PET signal-to-noise ratio and improve the image. The effect of improving quality and signal-to-noise ratio

Active Publication Date: 2022-07-29
ZHONGSHAN MINFOUND MEDICAL EQUIP CO LTD
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is: to solve the problem of obtaining the threshold value by experiment, which is time-consuming and the accuracy is not high. Applying the empirical threshold value obtained by the test to the whole machine system cannot fully represent the threshold state of the whole machine , can not effectively filter the noise signal, and also affect the performance of the system

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  • A method to improve the signal-to-noise ratio of pet
  • A method to improve the signal-to-noise ratio of pet
  • A method to improve the signal-to-noise ratio of pet

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Embodiment 1

[0049] The method for improving the PET signal-to-noise ratio in this embodiment is to use a pulse signal discrimination circuit with high and low double threshold comparators, such as figure 1 shown, including the following steps:

[0050] S1. Data collection;

[0051] S2. Data analysis;

[0052] S3. Threshold table generation;

[0053] S4. Threshold table loading;

[0054] S5. Pulse filtering.

[0055] 1. Data collection, such as figure 2 shown, including the following steps:

[0056] (1) Respectively configure the number of acquisitions N=20; the acquisition step step=3; the initial high threshold Th 0 =10mV;

[0057] (2) Automatically load the threshold table;

[0058] (3) Start single data collection;

[0059] (4) The current data collection ends, and the current data collection times n are recorded. If n

[0060] (5) Current threshold Th n =Th 0 +(n-1)×step=1...

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Abstract

The invention discloses a method for improving PET signal-to-noise ratio, which relates to the technical field of medical imaging equipment. A pulse signal discrimination circuit with high and low double threshold comparators is adopted, which includes data acquisition; data analysis; threshold table generation; threshold table Loading; pulse filtering. By automatically changing the high threshold, by obtaining the energy inflection point position and starting point position information of each block in the current state, by obtaining the energy inflection point position and the relationship between the threshold and the threshold value L1 and the relationship between the starting point position and the threshold value L2 for all acquisitions, Obtain the intersection point P of L1 and L2 of the corresponding block, and obtain the threshold value corresponding to the intersection point, and use the threshold value as the final threshold value of the block to achieve accurate calibration of the threshold value of the block, and finally realize the improvement of the PET signal-to-noise ratio. The purpose of improving image quality.

Description

technical field [0001] The invention relates to the technical field of medical imaging equipment, in particular to a method for improving the PET signal-to-noise ratio. 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 positrons, which rapidly annihilate radiation with negative electrons in the body, and produce 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) ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03
CPCA61B6/037A61B6/5258
Inventor 吴国城叶宏伟钱华黄振强
Owner ZHONGSHAN MINFOUND MEDICAL EQUIP CO LTD
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