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Image reconstruction method and device

An image reconstruction and image technology, applied in the field of image processing, can solve the problems of missing MR images, time-consuming, deviation from the global optimal solution, etc., to achieve the effect of improving the acquisition speed, accurately attenuating the image, and improving the speed.

Active Publication Date: 2015-06-10
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

However, for nonTOF PET data, studies have shown that the co-estimation method is not mathematically stable, and optimization will lead to it locally reaching an optimal solution but may deviate from the global optimal solution
On the other hand, TOF information will help to achieve a stable cooperative estimation of emission and attenuation, but the calculation time and number of iterations of emission and attenuation estimation are very long. High-frequency noise is brought to the emission image, so it takes a long time to perform collaborative estimation using only TOFPET data
For methods based on MR image processing, when partial images such as arms appear outside the FOV and are truncated, part of the MR image will be missing and the attenuation coefficient of PET in this part cannot be effectively estimated.
In summary, the existing PET image reconstruction methods cannot use MR images to obtain more accurate attenuation images for PET image reconstruction

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Embodiment Construction

[0061] In the prior art, a corresponding attenuation image may be acquired through a nuclear magnetic resonance (Magnetic Resonance, MR) image. However, since the field of view (FOV) of the MR image may be limited, causing truncation at the edge of the MR image, especially for larger patients. In addition, the MR image is distorted due to metal implants or ports. Therefore, the image reconstruction method in the prior art cannot use the MR image to obtain a relatively accurate attenuation image for PET image reconstruction.

[0062] In order to solve the above-mentioned problems existing in the prior art, the technical solution adopted in the embodiment of the present invention first obtains the corresponding CT image from the MR image, and then uses the obtained CT image to obtain the corresponding attenuation image for PET image reconstruction, which can A more accurate attenuation image is obtained.

[0063] In order to make the above objects, features and advantages of th...

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Abstract

The invention discloses an image reconstruction method and an image reconstruction device. The image reconstruction method comprises the following steps: obtaining an MR (magnetic resonance) image of a scanned object through MR scanning; obtaining a CT (computed tomography) valuated image corresponding to the MR image; using the CT valuated image to generate a corresponding initial attenuation image used for reconstruction of a PET image; through the PET scanning, obtaining PET radiating data of the scanned object; using the PET radiating data and the initial attenuation image, iteratively reconstructing the PET radiating image and the attenuation image of the scanned object. The image reconstruction method and the image reconstruction device can improve the precision and speed of PET image reconstruction.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a PET image reconstruction method and device. Background technique [0002] Positron Emission Computed Tomography (PET) is a neurographic examination instrument developed rapidly after computerized tomography (Computed Tomography, CT). At present, it has highlighted the important value in the diagnosis and treatment of the three major diseases of tumor, coronary heart disease and brain disease, and it is a relatively advanced clinical examination imaging technology in the field of nuclear medicine. It can inject radioactive tracers into living organisms without changing the physiological state, and participate in the physiological metabolism of living organisms. The positrons produced by the decay of the tracer markers, and the annihilation effect of the positrons, produce reversely emitted 511keVγ photon pairs. Use coincidence detection technology to detect pa...

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005G06T2207/10081G06T2207/10104G06T2211/416
Inventor 朱闻韬何任杰李洪第
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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