Method for reducing PROPELLER sequence artifacts

A sequence and data tape technology, applied in the field of reducing the artifacts of nuclear magnetic resonance equipment, can solve the problems of small number of data lines, short magnetic resonance signals, and restrictions on the application of PROPELLER sequences

Active Publication Date: 2020-06-05
上海康达卡勒幅医疗科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the hardware configuration of the system is not strong, or the magnetic resonance signal attenuates prematurely and disappears due to the short T2 relaxation time of the scanned tissue, and the number of data lines collected after one excitation of the PROPELLER sequence is small, the complete data cannot be obtained. There are obvious star-shaped artifacts in the image (the data acquisition schematic diagram is attached figure

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  • Method for reducing PROPELLER sequence artifacts
  • Method for reducing PROPELLER sequence artifacts
  • Method for reducing PROPELLER sequence artifacts

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Embodiment

[0083] In this embodiment, it will be demonstrated how the present invention can increase the number of data lines in each data band by dividing a data band into multiple excitations according to the scanning parameters, so as to simultaneously eliminate starburst artifacts and motion artifacts Effect.

[0084] like Figure 1-5 As shown, it includes two parts of data acquisition and data reconstruction, among which,

[0085] The data collection part includes the following steps:

[0086] Step dS1: Acquiring PROPELLER sequence acquisition trajectory parameters;

[0087] Step dS2: perform the first excitation, and collect the ETL echo chain;

[0088] Step dSS: repeat step dS2;

[0089] Step dS4: Repeat step dS2 and step dSS;

[0090] The data reconstruction part includes the following steps:

[0091] Step iS1: performing self-phase correction on multiple excited data lines within each data band;

[0092] Step aiS1: adjusting the data band;

[0093] Step iS5: Process the ...

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Abstract

The invention discloses a method for reducing PROPELLER sequence artifacts, which comprises a data acquisition part and a data reconstruction part, and is characterized in that the data acquisition part comprises the following steps: step dS1, acquiring PROPELLER sequence acquisition track parameters; step dS2, carrying out first excitation, and collecting an ETL echo chain; step dS3, repeatedly executing the step dS2; step dS4, repeatedly executing the step dS2 and the step dS3; step iS1, carrying out self-phase correction on data lines excited for multiple times in each data band; step aiS1,adjusting the data band; step iS5, processing the data to obtain a final image, wherein the step aiS1 comprises the following steps: step iS2, performing inter-band phase correction between data bands. According to the invention, the data lines excited and collected for multiple times are filled into one data band, so that the effect of increasing the width of the data band is achieved to enablethe data band formed by multiple excitation combinations to meet the requirements of a subsequent PROPELLER reconstruction algorithm; star-shaped artifacts are eliminated; and motion artifacts are eliminated.

Description

technical field [0001] The invention relates to a method for reducing nuclear magnetic resonance equipment artifacts, in particular to a method for reducing PROPELLER sequence artifacts. Background technique [0002] Magnetic resonance imaging (MRI) technology has become an important means in medical diagnosis. When the subject moves during the scanning process, motion artifacts will appear in the images obtained by conventional scanning techniques, and severe motion artifacts may even affect clinical medical diagnosis. The Periodically Rotated Overlapping Parallel Lines with Enhanced Reconstruction (PROPELLER) sequence collects magnetic resonance data in a manner similar to propeller rotation, and adds a motion correction function to the reconstruction module, which can effectively reduce the MRI artifacts. [0003] After the PROPELLER sequence is excited once, several echo signals are collected as data lines to form a data band, and multiple data bands rotating around th...

Claims

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Application Information

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IPC IPC(8): G01R33/48G01R33/56G01R33/561G01R33/565
CPCG01R33/4818G01R33/5608G01R33/56509G01R33/565G01R33/5615
Inventor 姜小平蔡昕郑慧张琦蔚李建奇
Owner 上海康达卡勒幅医疗科技有限公司
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