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Accurate PET normalization correction method

A calibration method and normalization technology, which is applied in the fields of radiological diagnostic instruments, medical science, patient positioning for diagnosis, etc., can solve problems such as radiation efficiency deviation and relative position inconsistency, so as to improve accuracy and overcome inconsistency , Reduce the difficulty of operation and the effect of irradiation time

Active Publication Date: 2018-12-25
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] Such as figure 2As shown, the ring formed by the detectors of the PET equipment is referred to as the detector ring. The radius of the detector ring is R, and the number of detector rings is C2, which are respectively the first to C2 detector rings R1~Rc2, and each The radii of the detector rings are consistent and 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 i-th 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 i-th detector i is consistent.

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

[0047] 1) PET ...

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Abstract

The invention discloses an accurate PET normalization correction method. The method comprises the steps of utilizing PET equipment for collecting data of a uniform source, acquiring normalized data, and obtaining efficiency factors of detectors; then processing the normalized data, obtaining the center of the uniform source, calculating a center deviation correction factor according to the positions of the detectors, correcting the efficiency factors of the existing detectors, and correcting the possible inconsistency between the center of the uniform source and the centers of detector rings.By means of the method, the problem of inconsistency between the center of the uniform source and the centers of the detector rings is solved, the operation difficulty of an operator is reduced, the irradiation time for the operator is shortened, and meanwhile the accuracy of the efficiency factors of detection units is improved.

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...

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Application Information

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Patent Type & Authority Applications(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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