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Projection method and projection device for image reconstruction based on PET (positron emission tomograph)

A technology of projection and projection diagram, which is applied in the medical field, can solve the problems of increasing the amount of calculation, consuming a large amount of time, reducing the calculation rate, etc., to achieve the effect of reducing the amount of calculation, ensuring accuracy, and increasing the calculation rate

Inactive Publication Date: 2014-02-19
NEUSOFT MEDICAL SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, there are two types of common projection methods: ray-driven and pixel-driven. For line-driven: the length of the line segment that intersects the center line between the two detector crystals with a certain pixel can be calculated To calculate the contribution of the pixel to the projected area, in this process, a pixel can be divided into several pixels to improve the calculation accuracy, but at the same time it will increase the calculation amount and reduce the calculation rate; for pixel drive: you can judge a certain Whether a pixel is within the range of the projection area is used to determine whether the pixel contributes to the projection. The pixel can also be divided into multiple sub-pixels to improve the calculation accuracy, but it will also increase the amount of calculation.
[0004] In summary, the existing projection methods will inevitably consume a lot of time for calculation in the process of image reconstruction.

Method used

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  • Projection method and projection device for image reconstruction based on PET (positron emission tomograph)
  • Projection method and projection device for image reconstruction based on PET (positron emission tomograph)
  • Projection method and projection device for image reconstruction based on PET (positron emission tomograph)

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Embodiment 1

[0063] refer to figure 2 , figure 2 The flow chart of the projection method for PET-based image reconstruction provided in this embodiment may specifically include:

[0064] Step 201S: On the PET circular plane, determine the pixel distribution diagram of the image to be projected along the projection area, the pixel distribution diagram includes pixel columns of the image to be projected, and the pixel columns are parallel to the projection area;

[0065] In this embodiment, on the PET circular plane, determine the pixel distribution map of the image to be projected along the projection area, wherein the pixel distribution map includes the pixel columns of the image to be projected, and the projection area along the pixel column is to make the pixel column and The projected areas are parallel.

[0066] In this embodiment, any image rotation algorithm can be used to determine the pixel distribution map of the image to be projected, so that the pixel columns of the image to...

Embodiment 2

[0101] Such as image 3 , where 301 is the projection area between two detector crystals, and 302 is a three-dimensional image to be projected formed by square pixels arranged in rows and columns. Figure 4 The projection in 301a is image 3 A cross-sectional view of the middle projection area 301 on the x-y plane, Figure 5 The projection in 301b is image 3 A cross-sectional view of the middle projection area 301 in the y-z plane. If the projection value of the projection area 301 is to be calculated, the volume of each pixel in the projection area 301 needs to be accumulated one by one.

[0102] Among them, the projection calculation formula is as formula (1),

[0103] P = V 1 V p λ 1 + V 2 V p λ ...

Embodiment 3

[0128] refer to Figure 11 , Figure 11 The structural diagram of the projection device for PET-based image reconstruction provided in this embodiment may specifically include:

[0129] The first determination module 901 is configured to determine a pixel distribution map of the image to be projected along the projection area on the PET circumferential plane, the pixel distribution map includes pixel columns of the image to be projected, and the pixel column is parallel to the projection area ;

[0130] A resampling module 902, configured to resample the pixel distribution map, so that the width of the pixel column is equal to the width of the projection area;

[0131] The first obtaining module 903 is configured to obtain a pixel axial projection diagram after projecting the image to be projected on the PET axial plane, and the pixel axial projection diagram includes pixel units;

[0132] The second acquiring module 904 is configured to acquire axial projection diagrams of...

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Abstract

The invention discloses a projection method and a projection device for image reconstruction based on PET (positron emission tomograph). The method comprises the steps of determining a pixel distribution diagram of an image to be projected along a projection area in a PET annular plane, wherein the pixel distribution diagram comprises pixel columns of the image to be projected, and the pixel columns are parallel to the projection area; carrying out resampling on the pixel distribution diagram, and enabling the width of the pixel columns to be same as the width of the projection area; acquiring a pixel axial projection image, wherein the pixel axial projection image comprises pixel units, and acquiring axial projection images of all projection areas on a PET axial plane; and acquiring a projection value of the image to be projected according to the pixel axial projection image and the axial projection images of all of the projection areas. Compared with the prior art, the projection method and the projection device reduce the calculation amount of projection under the premise of ensuring the accuracy of image projection, thereby improving the calculation efficiency of image projection.

Description

technical field [0001] The invention relates to the field of medical technology, in particular to a projection method and device for image reconstruction based on PET. Background technique [0002] Positron Emission Tomograph (PET) is an advanced molecular imaging diagnostic equipment in today's medical field, and it is one of the most important modern medical imaging techniques. Such as figure 1 , figure 1 It is a schematic diagram of the structure of PET, wherein, when performing medical imaging based on PET, PET can obtain the reconstruction data of the currently scanned object, and after completing the PET scan of the object, image reconstruction can be completed through the reconstruction data obtained by PET, specifically, image reconstruction It can be divided into analytical reconstruction and iterative reconstruction. Among them, iterative reconstruction is widely used, but iterative reconstruction needs to complete the process of projection and back-projection re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00A61B6/03
Inventor 陈锡民韩冬王军博杨金柱赵大哲
Owner NEUSOFT MEDICAL SYST CO LTD