Attenuation rectifying method and system

An attenuation correction and corrected technology, applied in the field of image processing, can solve problems such as physical harm to patients, inability to match organs at acquisition time, and artifacts in PET images.

Active Publication Date: 2013-04-24
SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since respiratory movement will drive the movement of organs, tissues or lesions, the difference in acquisition time between PET data and CT data will cause some organs to fail to match
When using CT data to perform attenuation correction on PET data, it will have a certain impact on the Standardized Uptake Value (SUV), and the offset of SUV can reach 24%~30%, and the corrected PET image may produce certain artifacts , affecting clinical diagnosis
[0009] (2) Motion blur caused by respiratory movement during PET data acquisition
[0017] When using the first method to solve the problem of artifacts in attenuation-corrected PET images using CT data, it can only solve the artifacts caused by the mismatch between PET data and CT data information, and cannot solve the problem of motion blur caused by respiratory movement;
[0018] When using the second method to solve the problem of artifacts in PET images with attenuation correction using CT data, it is necessary to perform multiple CT scans on the patient at different time intervals in the respiratory cycle. cause great harm to the body

Method used

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Experimental program
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Embodiment 1

[0143] figure 1 It is a flow chart of Embodiment 1 of an attenuation correction method in the present invention, including:

[0144] Step 101: collecting standard PET data and standard CT images in standard time phases, and non-standard PET data in various non-standard time phases.

[0145] Positron Emission Tomography (PET) data is the data received by PET scanning equipment after scanning the patient's organs.

[0146] The PET data under the standard time phase and the PET data under each non-standard time phase are PET data collected in one respiratory cycle. When the standard time phase is in one respiratory cycle, standard CT images are collected.

[0147] A respiratory cycle is divided into multiple time phase intervals according to the respiratory information, generally 6-8. The breath information is time information or amplitude information. The standard time phase is a time phase interval in a breathing cycle, which can be set according to the actual situation. No...

Embodiment 2

[0203] figure 2 It is a flowchart of Embodiment 2 of an attenuation correction method of the present invention. Compared with Embodiment 1, in Embodiment 2, a multi-scale non-rigid matching method is used to obtain motion information, specifically including:

[0204] Step 201: collect the respiration signal cycle, and divide the respiration signal cycle into a standard time phase interval and at least one non-standard time phase interval according to the respiration information.

[0205] Breath information includes time information or amplitude information.

[0206] Use the respiratory gating device to collect a respiratory signal cycle, and divide a respiratory signal cycle into multiple time phase intervals according to the respiratory information. There are the following two methods:

[0207] The first method: split according to time information

[0208] image 3 It is a schematic diagram of dividing a respiratory cycle into multiple time phase intervals according to ti...

Embodiment 3

[0265] Figure 5 It is a structural schematic diagram of Embodiment 3 of an attenuation correction system of the present invention, which is a system corresponding to the method of Embodiment 1, including:

[0266] The acquisition module 501 is configured to acquire standard PET data and standard CT images in standard time phases, and non-standard PET data in various non-standard time phases.

[0267] The image reconstruction module 502 is configured to perform image reconstruction on standard PET data in standard phases and non-standard PET data in various non-standard phases to obtain standard PET images and non-standard PET images in various non-standard phases.

[0268] The motion information obtaining module 503 is configured to respectively obtain motion information of the non-standard PET image in each non-standard time phase relative to the standard PET image.

[0269] The motion information acquisition module 503 specifically includes:

[0270] An image input unit 5...

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Abstract

The invention discloses an attenuation rectifying method and system. The attenuation rectifying method includes: collecting standard polyethylene terephthalate (PET) data and a standard computed tomography (CT) image under the standard time phase and nonstandard PET data under various nonstandard time phases; performing image reconstruction on the standard PET data under the standard time phase and the nonstandard PET data under the nonstandard time phases to obtain a standard PET image and nonstandard PET images under the various nonstandard time phases; respectively obtaining the motion information of the nonstandard PET images corresponding to the standard PET image under the various nonstandard time phases; performing motion compensation on the standard CT images according to the various motion information to obtain the nonstandard CT images under the various nonstandard time phases; performing attenuation rectifying on the standard PET data through the standard CT image, and performing attenuation rectifying on the nonstandard PET data under the same time phase through the nonstandard CT images under the various nonstandard time phases so as to obtain the CT images of different phase intervals without repeated CT scanning.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method and system for attenuation correction. Background technique [0002] Positron Emission Tomography-Computed Tomography (PET-CT) combines PET technology with CT technology. [0003] Positron Emission Tomography (PET) is to mark certain substances necessary in the metabolism of biological life, such as glucose, protein, nucleic acid and fatty acid, etc., with short-lived radioactive sources (such as fluorine 18, Carbon 11, etc.), after being injected into the human body, through the accumulation of the substance in the metabolism, it reflects the situation of life metabolic activities, so as to achieve the purpose of diagnosis. [0004] Computed Tomography (Computed Tomography, CT) is a single-axis ray that penetrates the object under test. Tomographic images are reconstructed to obtain three-dimensional tomographic reconstruction images, and tomographic images of all dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03G06T5/00
Inventor 韩震刘月李明
Owner SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
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