A normalized correction factor acquisition method and medical imaging method

Abstract

The invention discloses a method for obtaining a normalized correction factor, comprising: determining any two channels i in a detection system based on actually collected data during the attenuation process of a uniform phantom 1 and i 2 The actual sensitivity of the resulting response line is the ε i is the actual sensitivity of the i-th channel; in the same detection system, any i-th channel is determined based on the system response matrix 1 and i 2 The theoretical sensitivity of the response line formed by the two channels is the η i is the theoretical sensitivity of the i-th channel; determine any i-th channel in the detection system 1 and i 2 The normalization factor of the response line formed by the two channels is: the method is used to correct the difference between the geometric factor of the response line of the system response matrix and the geometric factor of the actual detection system response line, so as to realize the correction of the sensitivity of the response line, and then realize the detection System sensitivity correction.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an acquisition method of a normalized correction factor and a medical imaging method. Background technique [0002] PET is the abbreviation of English Positron Emission Tomography. The clinical imaging process is as follows: labeling a positron-emitting radionuclide (such as F-18, etc.) on a compound that can participate in the blood flow or metabolic process of human tissues, and injecting the radionuclide labeled with a positron-bearing compound into the compound. in the subject's body. Have the subject perform a PET scan within the effective field of view of the PET. The positrons emitted by the radionuclide move about 1mm in the body and combine with the negative electrons in the tissue to generate annihilation radiation, producing two γ photons with equal energy (511KeV) and opposite directions. Using the detection system of the PET device, the gamma photon pair ...

AI Technical Summary

Problems solved by technology

However, when there is a difference between the way the actual detection system collects data and the method used to obtain the system response matrix, the traditional normalization method cannot correct the difference between the actual detection system sensitivity and the system response matrix

Therefore, a new normalization factor acquisition method is needed to solve the problem of inconsistency between the system response matrix and the actual detection system sensitivity

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