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Terahertz imaging method based on rapid convergence of ordered subset

A terahertz imaging, fast convergence technology, applied in the field of terahertz imaging, can solve the problems of reducing image quality, reducing imaging efficiency, prone to artifacts, etc., to ensure imaging quality, improve imaging efficiency, and improve the effect of convergence speed

Inactive Publication Date: 2019-02-22
XIDIAN UNIV
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Problems solved by technology

At the same time, the use of filtered back projection algorithm is prone to artifacts and reduces image quality
In order to improve the imaging quality, a large amount of data needs to be collected, which will reduce the imaging efficiency.

Method used

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  • Terahertz imaging method based on rapid convergence of ordered subset
  • Terahertz imaging method based on rapid convergence of ordered subset
  • Terahertz imaging method based on rapid convergence of ordered subset

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Embodiment Construction

[0033] The embodiments and effects of the present invention will be further described below in conjunction with the accompanying drawings.

[0034] refer to figure 1 , the implementation steps of the present invention are as follows:

[0035] Step 1, data collection.

[0036] Data acquisition can be carried out using a terahertz continuous wave system or a terahertz time-domain spectroscopy THz-TDS system. However, since the terahertz continuous wave system can only collect signal intensity information, phase information cannot be obtained, and signals of a certain frequency or a certain frequency range cannot be obtained, while the terahertz time-domain spectroscopy THz-TDS system can not only obtain the amplitude information of items Phase information can also be obtained, so this example uses the THz-TDS system to record data.

[0037] Such as figure 2 As shown, the terahertz signal of the terahertz time-domain spectroscopy THz-TDS system is excited by the laser, one o...

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Abstract

The invention discloses a terahertz imaging method based on rapid convergence of an ordered subset, mainly solving the problem that the imaging speed of the prior art is relatively slow. The realization process of the method is as follows: fixing a terahertz time-domain spectrum THz-TDS system, controlling a target object to move through a three-dimensional scanning frame system, and recording data in a mode of controlling target rotation through a turntable in the scanning frame system; carrying out pretreatment on recorded data by adopting a method of frequency domain energy summation to obtain pretreated data; carrying out treatment on the pretreated data by utilizing the Beer's law to obtain attenuation coefficient line integral data; dividing the attenuation coefficient line integraldata into ordered subsets according to subset equilibrium conditions; carrying out imaging on ordered subset data by adopting a quadratic convergence step length algorithm, and updating an image through loop iteration until meeting convergence requirements so as to realize terahertz imaging. According to the method, the image convergence rate is accelerated, the imaging efficiency is improved, andthe method can be applied to terahertz imaging in biological tissue and medical sciences.

Description

technical field [0001] The invention belongs to the field of imaging technology, and further relates to a terahertz imaging method, which can be used for terahertz imaging in biological tissues and medical scenes. Background technique [0002] Terahertz waves usually refer to electromagnetic waves with a frequency range of 0.1THz to 10THz, located between millimeter waves and infrared light, and have the advantages of penetrability, large bandwidth, spectrum fingerprint recognition, and safety and non-destructiveness. As a new technology, terahertz technology has made breakthroughs in the past few decades, and has attracted more and more attention from researchers and industries, and has been widely cited in the fields of security inspection, medicine, biology, and national defense. . [0003] Terahertz imaging can obtain multi-layer information of objects, which is an important direction for the development of terahertz technology. The expectation maximization algorithm b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3581G01V8/10A61B5/05
CPCA61B5/0507G01N21/3581G01V8/10
Inventor 丁金闪王天鹤吴紫阳
Owner XIDIAN UNIV
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