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A method for depth measurement of radiation hotspots based on tetra-encoded gamma camera

A gamma camera and binocular camera technology, applied in the field of nuclear safety, can solve the problems of large fluctuations, affecting the ranging range, unfavorable carrying and operation, etc., achieve high ranging range and accuracy, and reduce measurement errors.

Active Publication Date: 2022-07-01
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

If the distance is too large, it is not conducive to carrying and operation in actual measurement; if the distance is too small, it will affect the actual detection range
[0012] (3) There is a certain measurement error in the binocular camera ranging, resulting in unstable ranging results and large fluctuations

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  • A method for depth measurement of radiation hotspots based on tetra-encoded gamma camera
  • A method for depth measurement of radiation hotspots based on tetra-encoded gamma camera
  • A method for depth measurement of radiation hotspots based on tetra-encoded gamma camera

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[0049] The present invention will be further described in detail below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

[0050] The invention proposes a new method for determining sub-pixel coordinates of radiation hotspots in a reconstructed image based on a quadrature coded gamma camera, and a method for estimating the distance of radiation hotspots. The overall flow of radiation hotspot distance measurement is as follows figure 1 shown. Each step is described below.

[0051] 1. Interpolate and reconstruct the projection data

[0052] The reconstructed image (ie reconstruction data, reconstruction matrix) of the tetracular coding gamma camera can be obtained by correlating the projection matrix (ie projection data) with the decoding matrix, as shown in the well-known formula (1), where O is the reconstruction data and R is the projection matrix, G is the decoding...

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Abstract

The invention discloses a method for measuring the depth of radiation hotspots based on a tetracular coding gamma camera. Reconstruction after interpolation to obtain four reconstructed images; 2) respectively determine the sub-pixel coordinates of a radiation hot spot according to each of the reconstructed images; 3) the vertices of each camera in the quad-lens coded gamma camera are corresponding to the camera. The positions of the radiation hot spots in the reconstructed image are connected and extended to obtain four straight lines in space; the coordinate points on the four straight lines at different depths are connected to form a quadrilateral and its area is calculated, and the area changes of the quadrilateral at different depths are fitted by parabola; The depth corresponding to the vertex of the fitted parabola is taken as the distance from the radiation hotspot to the detector. The invention improves the range and precision of distance measurement, and reduces the measurement error.

Description

technical field [0001] The invention belongs to the field of nuclear safety and nuclear radiation imaging, and relates to the measurement of the distance of radiation hotspots by a quadrocular encoded gamma camera, in particular to a method for depth measurement of radiation hotspots based on the quadrature encoded gamma camera. Background technique [0002] The coded aperture gamma camera provides gamma ray information and analyzes it through the interaction of gamma rays with coded aperture devices, so as to display the location or intensity information of gamma ray sources in the environment in the form of numerical or two-dimensional images, which have High detection efficiency, high sensitivity and high position resolution are widely used in aerospace, nuclear power, security and other fields. [0003] The coded aperture gamma camera uses a code plate with a specific coding method to code and modulate the gamma rays generated by the radionuclide. The back-end detector r...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C3/00G01J5/48
CPCG01C3/00G01J5/0003
Inventor 于月刘彦韬梁秀佐章志明刘双全李道武帅磊魏存峰魏龙
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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