Method for iteratively extracting movement parameters of angiography image guided by multi-parameter model

A technology of motion parameters and angiography, applied in image data processing, image analysis, image enhancement, etc., can solve problems such as inability to accurately separate breathing and heart, and inability to automatically extract translational motion

Active Publication Date: 2015-04-15
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0008] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for iteratively extracting motion parameters of angiographic images guided by a multi-parameter model. Technical issues with inability to accurately separate movements such as breathing and heart

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  • Method for iteratively extracting movement parameters of angiography image guided by multi-parameter model
  • Method for iteratively extracting movement parameters of angiography image guided by multi-parameter model

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[0080] 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.

[0081] Below at first explain and illustrate with regard to the technical terms of the present invention:

[0082] The minimum mean square error: that is, the sum of the mean square accumulation of the difference between the estimated signal and the original signal is the smallest. In this paper, the multi-iterative parameter model utilizes the nature of discrete Fourier transform, adopts the m...

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Abstract

The invention discloses a method for iteratively extracting movement parameters of an angiography image guided by a multi-parameter model. The method comprises the following steps: automatically selecting I structural characteristic points of blood vessels from a medical image of a radiography image sequence, and respectively and automatically tracking the characteristic points in the whole radiography image sequence so as to obtain tracking sequences of all the characteristic points; treating the tracking sequences of all the characteristic points by utilizing discrete Fourier transformation so as to generate a discrete Fourier transformation result Si(k); initializing an iterative parameter j so as to enable the j to be equal to 0, obtaining a range and a frequency scope of each frequency point in the discrete Fourier transformation result Si(k), and performing the discrete Fourier transformation on the tracking sequence of the frequency point within the range and the frequency scope of each frequency point so as to obtain a Fourier transformation; performing an inverse Fourier transformation on the obtained Fourier transformation result, and obtaining an estimated minimum mean square error of the frequency point. Through the use of the method disclosed by the invention, the technical problems that a translational movement cannot be automatically extracted, and movements of breathing, a heart and the like cannot be accurately separated existing in an existing method can be solved.

Description

technical field [0001] The invention belongs to the intersection field of digital signal processing and medical imaging, and more specifically relates to a method for iteratively extracting motion parameters of angiography images guided by a multi-parameter model. Background technique [0002] In the X-ray contrast system, due to the influence of respiratory movement, the images of coronary vessels on the imaging surface will undergo two-dimensional movement. During the angiography process, in order to enable the angiography sequence to cover the entire coronary artery system, the doctor may move the catheter bed, which will result in a two-dimensional translation between different frames of an imaging sequence. Therefore, on the one hand, the coronary angiography image records the projection of the heart's own motion on the two-dimensional plane, and at the same time, it also superimposes the two-dimensional movement of the coronary artery on the angiography surface caused ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/20
CPCG06T7/20G06T7/0012G06T7/262G06T2207/10116G06T2207/30101
Inventor 张天序黄正华邓丽华张耀宗宋琼
Owner HUAZHONG UNIV OF SCI & TECH
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