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Projection method and system for PET image reconstruction

An image reconstruction and projection technology, applied in the field of medical imaging, can solve the problems of low image resolution, occupation, large memory, etc.

Pending Publication Date: 2022-01-07
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

These complex physical characteristics lead to different response functions of each LOR to surrounding pixels at different positions, so the system response matrix requires a large amount of calculation and requires a large memory, resulting in low calculation efficiency and slow image reconstruction speed. Slow; and if there is an error between the system response matrix and the real system response, it will also lead to problems such as reduced operational efficiency and low image resolution

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  • Projection method and system for PET image reconstruction
  • Projection method and system for PET image reconstruction
  • Projection method and system for PET image reconstruction

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[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present specification, the following briefly introduces the drawings that need to be used in the description of the embodiments. Apparently, the accompanying drawings in the following description are only some examples or embodiments of this specification, and those skilled in the art can also apply this specification to other similar scenarios. Unless otherwise apparent from context or otherwise indicated, like reference numerals in the figures represent like structures or operations.

[0021] It should be understood that "system", "device", "unit" and / or "module" as used herein is a method for distinguishing different components, elements, components, parts or assemblies of different levels. However, the words may be replaced by other expressions if other words can achieve the same purpose.

[0022] As indicated in this specification, words such as "a", "an", "an" and / or "the" are ...

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Abstract

An embodiment of the invention discloses a projection method and system for PET image reconstruction. A PET detector comprises a plurality of detector rings arranged in the axial direction, wherein each detector ring comprises a plurality of detection units arranged in the annular direction. The method comprises the following steps of: acquiring actual projection data of an object, wherein the actual projection data is acquired by the plurality of detection units conforming to lines of response (LOR); acquiring an initial three-dimensional image of the object; acquiring a first coincidence response model and a second coincidence response model, wherein the first coincidence response model is annularly associated with the detector, and the second coincidence response model is axially associated with the detector; determining predicted projection data corresponding to each LOR in the plurality of LORs based on the first coincidence response model and the second coincidence response model; and generating a target three-dimensional image of the object based on the predicted projection data and the actual projection data.

Description

technical field [0001] The present application relates to the field of medical imaging, in particular to a projection method and system for PET image reconstruction. Background technique [0002] PECT (Positron Emission Computed Tomography, positron emission computed tomography), hereinafter referred to as PET, is a relatively advanced clinical examination imaging technology in the medical field. The PET reconstruction process requires projection (also called forward projection) and / or backprojection using the detector system response matrix. The detector system response matrix is ​​a matrix that maps the radioactive intensity at different coordinate values ​​in three-dimensional space to the detector line of response (LOR). Due to the physical characteristics of the radiation detection of the PET system, the LOR not only responds to the pixels it passes through in three-dimensional space, but also responds with different weights to the pixels near the LOR periphery. These...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/005
Inventor 何鎏春胡德斌徐涵聪吕杨董筠
Owner SHANGHAI UNITED IMAGING HEALTHCARE