Sparse projection ultrasonic CT image reconstruction method based on CS

A CT image and sparse projection technology, applied in the field of medical imaging, can solve the problems of high system complexity and long scanning time, and achieve the effect of reducing the number of channels, reducing the scanning time, and speeding up the reconstruction speed

Inactive Publication Date: 2015-11-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a sparse projection ultrasound CT image reconstruction method based on compressed sensing. Target scanning, in order to solve the technical problems of long scanning time and high system complexity of the existing ultrasonic CT system, and at the same time improve the image quality by using iterative reconstruction

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  • Sparse projection ultrasonic CT image reconstruction method based on CS
  • Sparse projection ultrasonic CT image reconstruction method based on CS
  • Sparse projection ultrasonic CT image reconstruction method based on CS

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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0028] In practice, since the ultrasonic transmitting array can also be used to receive ultrasonic echoes, there are two types of ultrasonic CT, reflective and transmissive. Whether it is a transmission type or a reflection type, according to the Fourier diffraction projection theorem, the connection between the scattered field and the target spatial frequency information can be established. The...

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Abstract

The invention discloses a sparse projection ultrasonic CT image reconstruction method based on CS(compressed sensing), comprising the steps of: first scanning an object for times much less than times required the Nyquist theorem to obtain the projection data in a finite direction; performing one-dimensional Fourier transform on obtained projection data based on the Fourier diffraction projection theorem to obtain the space frequency information of an object fault cross section; allowing the object to possess sparsity in a transform domain through selecting a transform radix, and constructing the inverse problem based on 11 norm optimization according to the CS principle; and finally reconstructing an object image through a conjugate iterative algorithm. The method can substantially reduce projective ultrasonic CT projection times, system control complexity, equipment data memory space, and system scanning time, and minimize artifacts caused by patient breathing clinically; through iterative solution, the method can obtain high reconstruction quality, and can be greatly applied in the medical imaging field.

Description

technical field [0001] The invention belongs to the field of medical imaging, and more particularly relates to a sparse projection ultrasonic CT image reconstruction method based on compressed sensing. Background technique [0002] With the advancement of information processing technology and processing technology, ultrasonic tomography (Computed Tomography, CT for short) has gained more and more attention. Different from traditional B-ultrasound images of human tissue structure, it can provide the distribution of acoustic parameters of human tissue such as refractive index, attenuation coefficient, and density. It is a functional imaging with high resolution and sensitivity to dense tissue. High clinical application value. In mammography, for example, it has no radiation hazards and can distinguish benign from malignant tumors compared to x-rays. Early ultrasound CT borrowed from X-CT technology, assuming that ultrasound propagates in a straight line in the human body, ig...

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Application Information

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IPC IPC(8): G06T11/00G06T5/00
Inventor 尉迟明丁明跃花少炎
Owner HUAZHONG UNIV OF SCI & TECH
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