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

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...

AI Technical Summary

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 of X-ray projection to reduce the radiation dose. On the other hand, it is not possible to reduce the angle of X-ray projection so as not to affect the quality of the reconstructed image.

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