Positron tomography detector online real-time correction method

Abstract

A positron tomography detector online real-time correction method relates to the technical field of nuclear medicine, high-energy physics and the like. The positron tomography detector online real-time correction method utilizes a Monte Carlo method, calculates gain relative ratios of signal channels used for decoding a crystal array through accumulating a certain amount of random numbers, determines gain variation of an entire module by utilizing modular peak positions, and obtains gain adjustment ratios of the signal channels through formula calculation by utilizing self decay characteristics of Lu element in LYSO crystals, so as to achieve real-time adjustment of the system. The positron tomography detector online real-time correction method has few parameters related in adjustment, can achieve an adjustment by using data in less than 10 seconds, is low in error rate, and has lower detection and maintenance cost.

Description

technical field [0001] The present invention relates to but not limited to the following fields: nuclear medicine and high-energy physics, and specifically relates to the real-time adjustment technology of the stability of the detector. Background technique [0002] Due to the size and cost limitations of the detector system of most PET (positronemissiontomography, positron emission tomography) detector systems, it is difficult to read out the signal generated by each crystal independently. Encoding is achieved by using a small number of detectors plus two-dimensional image decoding. [0003] Whether it is a traditional module structure or a shared detector, the essence is to use several fixed-position detectors to sum up the relevant detector signals to obtain the total energy of the luminescent crystal, which is determined in a crystal array by the center of gravity method The location of the glowing crystals. [0004] Based on this principle, the system needs to generat...

AI Technical Summary

Problems solved by technology

Such as patent US7579599, in which MD AndersonGaryWong laboratory has done corresponding research, because adjusting the dynode voltage will lead to changes in transit time, it is not an appropriate approach

And in MDAnderson's design, an LED is used as a calibration source, which cannot be used in the acquisition process

And the LED itself will drift with temperature and voltage

And a feedback loop is needed to control the voltage, which virtually increases the cost

[0021] 2. GE's approach, such as the patent US6624422, needs to accumulate spectra for each crystal of the detector, which requires high processing capacity and increases the cost of the circuit

However, it requires a large amount of data, a long adjustment cycle, and complex circuits

The most important thing is that the analyzed peak value is composed of 4 channels of related detector signals. The signals affect each other and cannot accurately reflect the quality of a certain signal.

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