X-ray grating phase contrast imaging reconstruction method and system thereof

A phase contrast imaging and X-ray technology, which is applied in the field of medical imaging, can solve the problems of angle reconstruction images that cannot reduce X-ray projection, and image quality degradation.

Active Publication Date: 2019-02-22
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

But the sparse angle will bring the problem of degrading the quality of the reconstructed image
There is a technical contradiction here. On the one hand, it is necessary to reduce the angle

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  • X-ray grating phase contrast imaging reconstruction method and system thereof
  • X-ray grating phase contrast imaging reconstruction method and system thereof
  • X-ray grating phase contrast imaging reconstruction method and system thereof

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[0054] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that the technical solutions claimed in this application can be realized even without these technical details and various changes and modifications based on the following implementation modes.

[0055] Firstly, the concepts of absorption image, phase contrast image and scattering image are explained. The complex refractive index of the object can be written as: n=1-δ+iβ, the absorption image reflects the imaginary part of the refractive index of the object, that is, the attenuation coefficient of the object to X-ray; the phase contrast image reflects the refractive index of the object The real part is the phase information of the object; the scattering image reflects the scattering information of the X-ray by the object, that is, the change of the scattering angle of the X-ray.

[0056] The f...

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Abstract

The present application relates to the field of medical imaging, and discloses an X-ray grating phase contrast imaging reconstruction method and a system thereof. The method includes the following steps: obtaining downsampled projection data, extracting phase contrast projection, absorption projection and scattering projection; utilizing at least two projection data to reconstruct an image. This method makes full use of the material information obtained from grating phase contrast imaging and reconstructs images with two or three kinds of information. Compared with the existing technology, this method can obtain high-quality reconstructed images when the projection data of phase contrast CT imaging system is incomplete, thus realizing low-dose and fast grating phase contrast CT imaging.

Description

technical field [0001] This application relates to medical imaging, in particular to X-ray grating phase contrast imaging reconstruction technology. Background technique [0002] Traditional X-ray CT imaging uses the attenuation degree of X-rays passing through the object to obtain the internal information of the object, and measures the absorption factor of the object, but for objects composed of light elements, their absorption of X-rays is not obvious, so the traditional X-ray imaging technology is difficult to reveal the internal structure information of such weakly absorbing substances. X-ray phase contrast imaging (PCI) measures the phase factor of the sample. For light elements with small atomic numbers, the phase change of X-rays is 1000 times higher than the absorption difference in the same situation, thereby improving the contrast of biological soft tissues. Over the past few decades, PCI imaging technology has developed at least 4 imaging methods, including inte...

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Application Information

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IPC IPC(8): G06T11/00G06K9/62A61B6/00
CPCG06T11/003A61B6/484G06F18/28
Inventor 孙建奇柏慧屏
Owner SHANGHAI JIAO TONG UNIV
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