Fast iterative reconstruction method of high-resolution heat source image in positive-electron tomographic scanning

A technology of positron tomography and iterative reconstruction, applied in computed tomography scanners, echo tomography, etc., can solve problems such as unreasonable pixels and low count values

Inactive Publication Date: 2003-05-14
BEIJING TOP GRADE HEALTHCARE MEDICAL EQUIP CO LTD
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Problems solved by technology

Schmidlin summarized the iterative method into a unified form of two adjustable parameters relaxation factor and subset order, compared the convergence speed of the ML-EM plus over-relaxation factor method and the ordered subset method, and reconstructed the image quality, proving that the two The equivalent relationship between them, but in order to avoid negative pixel values ​​in the iterative process, the value of the super-relaxation factor is limited, and the super-relaxation factor is not introduced in the OSEM iterative method for secondary acceleration
Because after introducing the over-relaxation factor in OSEM, the pixels will have negative values ​​and unreasonably low count values ​​below the background

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  • Fast iterative reconstruction method of high-resolution heat source image in positive-electron tomographic scanning
  • Fast iterative reconstruction method of high-resolution heat source image in positive-electron tomographic scanning
  • Fast iterative reconstruction method of high-resolution heat source image in positive-electron tomographic scanning

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[0025]The heat source high-resolution fast image iterative reconstruction method (HHSR) in the positron tomography technique (PET) of the present invention is based on the usual OSEM method, and the method of the present invention introduces the super-relaxation factor and the upper and lower limit variable constraints simultaneously to obtain improvement Type OSEM, thereby solving the technical problem proposed by the present invention.

[0026] The flow chart of the heat source high-resolution fast image iterative reconstruction method (HHSR) in the positron emission tomography (PET) technique according to the present invention will be described in detail below.

[0027] refer to figure 2 Firstly, in step S1, PET is used to collect the gamma photon projection signals of patients who have been injected with radioisotope drugs in vitro, and the signals are modulated, amplified, AD converted, corrected, etc. by subsequent electronic devices, and are carried out according to ce...

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Abstract

In the present invention, the fast high-resolution image reconstruction of PET projection data is realized by introducing the organic combination of super-laxation speeding factor and variable background constraint, the reconstruction speed and spatial resolution are superior to available ordered subset expectation maximum (OSEM) process, and the antijamming capacity is superior to traditional filtering back projection (FBP) process. The present invention is the improvement of OSEM, and said algorithm combines several kinds of data processing technology in the reconstruction of the heat source image to obtain reconstructed image with high spatial resolution and low noise.

Description

technical field [0001] The invention relates to a method for processing tomographic image data, in particular to a method for hot-spot high-resolution fast image iterative reconstruction (Hot-spot High Spatial Resolution, HHSR for short) in positron emission tomography. Background technique [0002] Positron Emission Tomography PET (Positron Emission Tomography) is the highest level of nuclear medicine technology today, and it is also one of the most advanced large-scale medical diagnostic imaging equipment recognized by the current medical community. Positron emission tomography has become an indispensable and important method in the diagnosis and pathological research of tumors, heart and brain diseases. [0003] PET imaging is a highly specific functional imaging and molecular imaging based on electronic collimation technology, which mainly provides functional information about organs and their lesions at the molecular level. Tracer drugs used in PET are mainly 18 F-FDG...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03
Inventor 刘力
Owner BEIJING TOP GRADE HEALTHCARE MEDICAL EQUIP CO LTD
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