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Method and system for calculating sampling perfection with application-optimized contrasts by using different flip angle evolutions (SPACE) sequence signal and method for acquiring aorta signal

A technology of sequence signals and calculation methods, applied in the fields of measurement using nuclear magnetic resonance image system, magnetic resonance measurement, medical science, etc.

Active Publication Date: 2012-10-03
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, there is a large gap between the existing methods for calculating the signal strength of SPACE sequences and the actual measurement results

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  • Method and system for calculating sampling perfection with application-optimized contrasts by using different flip angle evolutions (SPACE) sequence signal and method for acquiring aorta signal
  • Method and system for calculating sampling perfection with application-optimized contrasts by using different flip angle evolutions (SPACE) sequence signal and method for acquiring aorta signal
  • Method and system for calculating sampling perfection with application-optimized contrasts by using different flip angle evolutions (SPACE) sequence signal and method for acquiring aorta signal

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[0026] The sampling rate of TSE (turbo spin echo, fast spin echo) technology has been improved compared with ordinary spin echo technology, but when it is applied to three-dimensional imaging, its scanning time may still be as long as tens of minutes. unacceptable. The limitation of TSE acquisition efficiency mainly lies in: 1. The echo chain cannot be too long. 2. The radio frequency energy absorption rate is very high, especially in high field, such as 3T system. In 2004, researchers at the University of Virginia in the United States first realized the SPACE three-dimensional fast spin echo imaging technology on the Siemens system, and successfully solved the problem left by TSE by using a variable flip angle design in the refocusing pulse.

[0027] In one embodiment, such as figure 1 As shown, a calculation method of a SPACE sequence signal, which is used to calculate the aortic blood flow signal, comprises the following steps:

[0028] S101: Set the blood flow velocity ...

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Abstract

The invention discloses a method for calculating a sampling perfection with application-optimized contrasts by using different flip angle evolutions (SPACE) sequence signal. The method comprises the following steps of: setting blood flow speed as laminar flow distribution; calculating an accumulated phase of an SPACE sequence according to the blood flow speed of the laminar flow distribution; calculating a rotation matrix of the SPACE sequence; calculating a relaxation matrix of the SPACE sequence according to the accumulated phase; calculating the evolution process of a spinning magnetization vector according to the rotation matrix and the relaxation matrix; and according to the evolution process of the spinning magnetization vector, calculating the signal strength of each flow layer, averaging, and thus obtaining the signal strength of blood flow. The blood flow speed is set as the laminar flow distribution, blood flow speed-magnetic resonance imaging (MRI) signal strength distribution which is obtained by calculation according to the Bloch equation can be well matched with experiment data, and a calculation result is accurate. Moreover, the invention also provides a system for calculating the SPACE sequence signal and a method for fitting an aorta blood flow signal according to an SPACE sequence signal accurate calculation method and sampling the aorta blood flow signal. By the invention, optimization of sequence parameters is facilitated.

Description

technical field [0001] The invention relates to magnetic resonance technology, in particular to a method and system for calculating SPACE sequence signals and an acquisition method for aortic signals. Background technique [0002] Traditionally, transesophageal echocardiography (TEE) has been used to study the characteristics of aortic plaques. This method puts an ultrasonic probe through the oral cavity into the patient's esophagus to detect plaques in the aorta, especially the aortic arch, at close range, so that the size of the plaque and whether it moves with the blood flow can be detected, but the trauma of TEE technology May pose a risk to the patient. With the development of MRI technology, we can already use MRI technology that does not damage the human body to study vascular plaques. Plaque characterization requires T1-weighted and T2-weighted images, using T1-weighted SPACE (sampling perfection with application-optimized contrasts by using different flip angle ev...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54G01R33/50A61B5/055
Inventor 张磊钟耀祖张娜刘新郑海荣
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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