4D-CBCT reconstruction method combining motion estimation and space-time tensor enhanced representation

A 4D-CBCT and joint motion technology, applied in image enhancement, calculation, 2D image generation, etc., can solve the problems of loss of tissue details, low contrast, low image quality, etc., achieve high soft tissue contrast and suppress streak artifacts , reduce the effect of additional radiation

Pending Publication Date: 2020-11-17
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of low image quality, loss of tissue details, and low contrast in the 4D-CBCT reconstruction method in the prior art, and intends to provide a 4D-CBCT reconstruction method that combines motion estimation and spatiotemporal tensor enhanced representation , called Motion Estimation and Spatiotemporal Tensor Enhanced representation Reconstruction (MESTER for short), witho

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  • 4D-CBCT reconstruction method combining motion estimation and space-time tensor enhanced representation
  • 4D-CBCT reconstruction method combining motion estimation and space-time tensor enhanced representation

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Embodiment 1

[0054] The flow chart of a 4D-CBCT reconstruction method of joint motion estimation and space-time tensor enhanced representation in this embodiment is as follows figure 1 As shown, the specific steps are as follows:

[0055] Step S1, acquiring an initial image and an initial deformation vector field;

[0056] Using a given respiratory signal to phase-divide the 4D-CBCT projection data, the divided projection data can be obtained P={p 1 ,p 1 ,...p t ,...p T}, where T is the total number of phases, p t is the projection data at the t phase; perform EM-TV reconstruction on the divided projection data to obtain the initial reconstructed image where f t 0 is the initial reconstructed image at phase t, and the superscript 0 represents the initial value; and the initial deformation vector field is obtained by using the initial image and the demons registration algorithm where t 1 ≠t, means t 1 The deformation vector field of the reconstructed image from the phase to the...

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Abstract

The invention discloses a 4D-CBCT reconstruction method combining motion estimation and space-time tensor enhancement representation, and belongs to the technical field of computed tomography. The method comprises the following steps: firstly, carrying out phase division on 4DCBCT projection data of a patient by utilizing a respiration signal, reconstructing by adopting an EMTV algorithm to obtainan initial image, and estimating an initial deformation vector field by utilizing the initial image; then, introducing the space-time tensor enhancement representation into an image reconstruction model, constraining the reconstructed image after deformation vector field processing, and obtaining an updated reconstructed image; then, establishing a symmetrical motion estimation model by utilizingthe updated reconstructed image and the projection data to obtain a new deformation vector field; and finally, alternately updating the reconstructed image and the deformation vector field through iteration to obtain a high-quality reconstructed image. Motion blur and aliasing artifacts in 4D-CBCT reconstruction can be effectively relieved, more details are reserved, the contrast ratio of the reconstructed image is improved, and the 4D-CBCT is promoted to be used in the field of image guided radiotherapy.

Description

technical field [0001] The invention relates to the technical field of computed tomography, and more specifically, relates to a 4D-CBCT reconstruction method that combines motion estimation and space-time tensor enhanced representation. Background technique [0002] With the rapid development of medical technology, tumor radiotherapy has entered the era of precision, that is, precise positioning, precise planning and precise radiotherapy. In the process of radiotherapy, the positioning and displacement errors between the tumor and the surrounding normal tissues will affect the accuracy of radiotherapy, thereby affecting the final treatment effect. In this process, image quality assurance is particularly important, which is the prerequisite for precise tumor positioning and tracking. To solve this problem, people combine radiotherapy equipment and imaging equipment to realize fully automatic tumor positioning and tracking, determine the position and movement trajectory of th...

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Application Information

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IPC IPC(8): G06T11/00G06T7/246
CPCG06T11/008G06T7/251G06T2211/424G06T2211/412G06T2211/428G06T2207/10081G06T2207/30061G06T2207/20081Y02T90/00
Inventor 刘进亢艳芹王勇汪军王族
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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