A neutron-gamma dual-mode simultaneous imaging method and system based on single-pixel detection

CN122084669AActive Publication Date: 2026-05-26NANJING TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING TECH UNIV
Filing Date
2026-04-27
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing neutron imaging systems are bulky and costly, making it difficult to meet the needs of on-site detection and mobile applications. Small neutron sources have low neutron flux, making it difficult to achieve high-resolution imaging. Neutron imaging and gamma element imaging lack a unified coding modulation and synchronous inversion mechanism, resulting in separate structure and element imaging, registration difficulties, and low efficiency.

Method used

A neutron-gamma dual-mode synchronous imaging method based on single-pixel detection is adopted. The sample under test is irradiated by modulated neutron beams with different coding modes. By combining neutron transmission and gamma ray information, a forward model and iterative inversion algorithm are established to achieve synchronous acquisition and automatic registration of neutron transmission structure and elemental distribution.

Benefits of technology

It achieves high-precision simultaneous imaging of structure and elemental information under miniaturized neutron source conditions, solves the problems of discrete imaging and registration difficulties, is suitable for engineering structure detection, and provides complete information on the internal structure of matter.

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Abstract

This invention discloses a neutron-gamma dual-mode synchronous imaging method and system based on single-pixel detection, belonging to the field of nuclear imaging technology. The method includes: irradiating the sample under test with modulated neutron beams of different encoding modes, identifying the neutron event count and gamma-ray energy spectrum for each irradiation; dividing the sample under test into several pixel units, reconstructing a neutron transmission structure image based on the neutron event count for each irradiation; obtaining the detection efficiency of the characteristic gamma rays received by each pixel unit of the sample under test, and constructing a gamma response modulation matrix in combination with the neutron transmission structure image; extracting the net count of the characteristic peaks of the target element from the gamma-ray energy spectrum, reconstructing an element distribution image in combination with the gamma response modulation matrix, and fusing it with the neutron transmission structure image for output. This invention achieves synchronous acquisition of structural and elemental information, automatic spatial registration, and joint high-precision reconstruction, and is particularly suitable for the engineering application of miniaturized neutron sources.
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