Method of restoring gamma photon scattering coincidence to true coincidence

A technology of gamma photons and scattering angles, which is applied to material analysis using wave/particle radiation, material analysis using radiation, and measuring devices, etc., can solve the problems of reducing the number of sampled data, information loss, unfavorable industrial applications, etc., to achieve Good image reconstruction quality, effect of eliminating scattering

Inactive Publication Date: 2019-01-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0010] The above gamma photon scattering correction methods estimate the gamma photon scattering data and then remove them from the original sampling data. Although the scattering error can be corrected, the number of sampling data i

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  • Method of restoring gamma photon scattering coincidence to true coincidence
  • Method of restoring gamma photon scattering coincidence to true coincidence
  • Method of restoring gamma photon scattering coincidence to true coincidence

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[0030] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0031] The positron annihilation technique uses a pair of gamma photon pairs with an energy of 511KeV and a direction of 180° flying away to acquire images when the positron is annihilated. In a detection system, if a pair of detectors simultaneously detects the pair of photons, the connection of the detectors is called the line of response (LOR) of the pair of gamma photons, and is recorded as an event. The detector records a large number of response lines within an event, and through the image reconstruction algorithm, a 3D image reflecting the change of the nuclide concentration can be obtained. Positron annihilation technology has been widely used in biomedicine, such as positron emission tomography (Positron Emission Tomography, PET) has been used clinically, and people are also exploring the application of this technology in the industria...

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Abstract

The invention discloses a method for restoring gamma photon scattering coincidence to true coincidence. The method comprises the following steps: step one, classifying single-time scattering responselines obtained by detecting through a detection device; step two, calculating an actual positions of scattering of gamma photons in each single-time scattering response line according to positions ofa detector pair through relations between energy and scattering angles of the gamma photons; step three, obtaining a detector with detected gamma photon energy of 511KeV and a detector on which an extension line of a connection line between the actual positions of scattering of the gamma photons passes, and taking a connection line between the two detectors as a true coincidence line; step four, repeating the step two and the step three and restoring all single-time scattering response lines on the pair of detectors to true coincidence lines; and step five, repeating the step four and restoring all the single-time scattering response lines on the detectors to the true coincidence response lines. The method is capable of eliminating scattering and reducing the number of the response lines,so that higher image reconstruction quality is achieved.

Description

technical field [0001] The invention relates to a method for restoring gamma photon scattering coincidences to true coincidences, and belongs to the technical field of positron image reconstruction. Background technique [0002] In the field of nondestructive testing, ultrasonic testing, electromagnetic ultrasonic testing, laser ultrasonic nondestructive testing, surface acoustic wave nondestructive testing, etc. have all made good progress, and there are many mature products, but in some special applications, The emergence of new non-destructive testing schemes is also required. For example, the state of the liquid inside some dense materials (including metal materials), the flow form of the fluid, and the online inspection in additive manufacturing, etc., need better non-destructive inspection methods. Taking the engine as an example, it is difficult to detect the oil supply of the engine lubricating oil system in place. The pipeline of the engine lubricating oil system i...

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Application Information

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IPC IPC(8): G01N23/04
CPCG01N23/04G01N2223/03G01N2223/1013
Inventor 郭瑞鹏赵敏姚敏徐君刘兼唐
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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