An accurate pet normalization correction method

A calibration method and normalization technology, applied in the field of medical devices, can solve problems such as radiation efficiency deviation and relative position inconsistency

Active Publication Date: 2021-08-20
北京锐视康科技发展有限公司
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Problems solved by technology

[0010] In order to solve the problem that the uniform source is not in the center of the detector ring, and the relative positions of the detector on the detector ring and the uniform source are inconsistent, resulting in deviations in the efficiency of the detector to detect rays, the present invention proposes a precise PET normalization method. normalization method

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Embodiment Construction

[0044] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0045] like figure 2As shown in the figure, the ring formed by the detectors of the PET equipment is referred to as the detector ring for short. The radii of the detector rings are the same, and they are arranged in an axially superimposed manner. The number of detectors on each detector ring is C1, which are the first to C1 detectors, respectively, on each detector ring. , each ith detector Di is located on the same straight line parallel to the axis, i=1,2,3....C1, on each detector ring, the center deviation correction factor M of the ith detector i is consistent.

[0046] like image 3 As shown, the accurate PET normalization correction method of this embodiment includes the following steps:

[0047] 1) The PET equipment collects data from a uniform source and obtains normalized data:

[0048] a) Place the uniform source on the tr...

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Abstract

The invention discloses an accurate PET normalization correction method. The present invention uses PET equipment to collect data on the uniform source, obtains normalized data, obtains the efficiency factor of the detector, then processes the normalized data, obtains the center of the uniform source, and calculates the center according to the position of the detector Correct the deviation correction factor, and correct the efficiency factor of the existing detector, and correct the inconsistency between the center of the possible uniform source and the center of the detector ring, so as to overcome the inconsistency between the center of the uniform source and the center of the detector ring Problems, reducing the operating difficulty and irradiation time of the operator, while improving the accuracy of the efficiency factor of the detection unit.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to an accurate PET normalization correction method. Background technique [0002] Positron Emssion Tomography (PET) is one of the medical molecular imaging methods. It consists of a PET device and a radioactive tracer injected into the patient's blood. A frequently used radiotracer is fluorodeoxyglucose (Fluoro-deoxy-glucose, FDG), which is a compound synthesized from a simple sugar and a small amount of radioactive fluorine. After the human body injects FDG, it will be in the Accumulated in tissues and organs in the body, at the same time, 18F will decay, emit a positron, and the positron will undergo an annihilation reaction to generate a pair of photons moving in the opposite direction. After being detected by PET, it is called a coincidence case. Its energy is 511KEV. The PET equipment can detect these photons and record the information of the pair of photons, and reconstruct t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03A61B6/04
CPCA61B6/037A61B6/0407A61B6/42
Inventor 熊先华曾海宁赵明
Owner 北京锐视康科技发展有限公司
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