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A generation method and system for attenuation images

An attenuation map and attenuation value technology, applied in the field of emission computed tomography imaging, can solve the problems such as the inability to reflect the subtle changes of the attenuation coefficient in the local area, the inability to accurately obtain the boundaries of organs or regions, and the limited accuracy of image matching. Accurate attenuation map, fast data, stable iterative effect

Active Publication Date: 2017-02-22
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

However, on the one hand, the types of tissues in the MR image segmentation or block regions are limited, and the above methods cannot well reflect the subtle changes in the attenuation coefficient of the local area; on the other hand, the matching accuracy between the MR images of the subject and the images in the database is limited. The recognition of pixel points is limited at the boundary of some divided regions, so the boundaries of organs or regions cannot be accurately obtained

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  • A generation method and system for attenuation images
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  • A generation method and system for attenuation images

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[0071] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application, and those skilled in the art can also apply the present application to other similar scenarios. It should be understood that these exemplary embodiments are given only to enable those skilled in the relevant art to better understand and implement the present invention, but not to limit the scope of the present invention in any way.

[0072] As indicated in this application and claims, the terms "a", "an", "an" and / or "the" do not refer to the singular and may include the plural unless the context clearly indicates an exception. Generally speaking, the terms "comprising" and "comprising" only suggest the inclusion of clearly identi...

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Abstract

The invention provides an attenuation image generation method for PET reconstruction. The method comprises the steps of acquiring an anatomy image and PET data, wherein the anatomy includes a plurality of voxels; acquiring a reference image from a prior data bank and registering the reference image to the anatomy image, wherein the reference image includes prior voxel partitioning information; dividing the anatomy image into a plurality of areas according to the prior voxel partitioning information and allocating attenuation coefficients for the voxels in a plurality of areas to generate a first attenuation image; calculating the registration precision of the anatomy and the reference image, and determining the attenuation value distribution of the voxels in the multiple areas according to the registration precision; updating the first attenuation image iteratively according to the attenuation value distribution of voxels and the PET data to acquire the attenuation estimation of a scanned part. The attenuation value distribution of voxels is introduced in a process of estimating an attenuation coefficient image, so that the attenuation coefficient image estimation is more stable and reliable. The invention also provides a PET image reconstruction method.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of emission computed tomography imaging, in particular to a method for estimating an attenuation map in PET image reconstruction based on MR image information. [0003] 【Background technique】 [0004] Emission computed tomography (Emission Computed Tomography) mainly includes single photon emission computed tomography (SPECT) and positron emission computed tomography (PET). An indispensable and important method for the diagnosis of brain diseases. Existing commercial mainstream PET is often integrated with computed tomography (CT) equipment for PET / CT scanning. Gamma rays will be attenuated when they pass through human tissues, and the attenuation of rays by tissues in various parts of the body is not uniform, resulting in distortion and distortion of PET images. Therefore, PET data need attenuation correction during image reconstruction to obtain the true spatial distribution of the radiotracer in...

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Application Information

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IPC IPC(8): A61B6/03A61B6/00
CPCA61B6/037A61B6/5229A61B6/5235A61B6/5247A61B6/5205A61B6/03G06T7/11G06T7/174G06T7/337A61B5/055A61B6/032A61B6/5294G06T11/006G06T2207/10081G06T2207/10088G06T2207/10104G06T2207/20076G06T2207/20221G06T2207/30048G06T2207/30061G06T2207/30096G06T2211/408G06T2211/424
Inventor 朱闻韬冯涛李弘棣韩妙飞
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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