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Single-photon level X-ray space-time imaging method

An imaging method, X-ray technology, applied in the field of medical imaging, can solve the problem of inability to realize ultra-weak light image data acquisition and reconstruction

Active Publication Date: 2022-03-15
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

[0004] Aiming at the deficiency that the existing X-ray imaging technology cannot realize ultra-weak light image data acquisition and reconstruction, the present invention proposes a single-photon-level X-ray space-time imaging method, which uses time-of-flight detection intensity reconstruction technology to realize single-photon level Ultra-weak light space-time imaging, thereby reducing the X-ray radiation dose to the human body

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Embodiment Construction

[0031] This embodiment relates to a single-photon-level X-ray space-time imaging method, comprising the following steps:

[0032] Step 1, such as figure 1 As shown, the photons of the continuous spectrum emitted by the X-ray source are filtered through the filter module of the area array imaging acquisition device, and the photons that reflect the characteristic spectrum of the X-ray target are selected to maintain the consistency of the X-ray wavelength and facilitate follow-up. Measurement of the quantitative attenuation of X-ray photons while avoiding radiation damage to the body by other high-energy photons.

[0033] Step 2. Attenuate the X-ray intensity at the single-photon level, so as to appear in space as figure 2 For the discrete photons shown, the Poisson process change of the photons is recorded by photon counting, so as to realize the estimation of the transmittance. According to the characteristics of X-ray passive imaging, the direct detection method is select...

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Abstract

A single-photon-level X-ray space-time imaging method, which obtains the arrival position information and arrival time information of single-photon X-rays through a space-time high-resolution area array imaging acquisition device, and calibrates the time walk-off effect of a single photon excitation pixel Realize the identification of a single X-ray photon, and then use the Poisson process characteristics of the photon to deduce the intensity information of the target from the arrival time information of the photon, and use the space-time variable correlation characteristics that the collected sparse photons satisfy, through the Poisson distribution The image reconstruction algorithm realizes the super-resolution image reconstruction of the target object by the ultra-weak X-ray light source of several photons. The invention utilizes the time-of-flight detection intensity reconstruction technology to realize single-photon-level ultra-weak light space-time imaging, thereby reducing the radiation dose of X-rays to the human body.

Description

technical field [0001] The invention relates to a technology in the field of medical imaging, in particular to a single-photon-level X-ray space-time imaging method. Background technique [0002] According to the principle of X-ray theory, the patient's safe exposure dose should be within 100 roentgens during X-ray examination, and then the allowable exposure times and time should be determined according to this exposure dose. For example, the total accumulation of chest fluoroscopy within a few days should not exceed 12 minutes, and the gastrointestinal examination should not exceed 10 minutes. Patients can only do 2 to 3 examinations in a year to prevent X-rays from causing health hazards to the human body. [0003] The characteristics and disadvantages of the existing single-photon level X-ray space-time imaging are that image acquisition and reconstruction cannot be realized under low-light conditions, and the radiation dose can only be increased, but it also causes dam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/32H04N5/217A61B6/00
CPCH04N5/32A61B6/4241A61B6/5205H04N23/81
Inventor 金贤敏李占明周恒
Owner SHANGHAI JIAOTONG UNIV