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Phase Correction Method and Application of Fast Spin Echo in Magnetic Resonance Imaging System

A technology of magnetic resonance imaging and spin echo, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve problems such as not considering the influence of stimulated echo image quality

Active Publication Date: 2017-08-22
SUZHOU LONWIN MEDICAL SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) This scheme does not take into account the impact of stimulated echo on image quality, and stimulated echo is one of the main causes of image artifacts

Method used

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  • Phase Correction Method and Application of Fast Spin Echo in Magnetic Resonance Imaging System
  • Phase Correction Method and Application of Fast Spin Echo in Magnetic Resonance Imaging System
  • Phase Correction Method and Application of Fast Spin Echo in Magnetic Resonance Imaging System

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Experimental program
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Effect test

Embodiment

[0037] Embodiment: The normal image scanning FSE sequence is adopted, the gradient of the phase encoding direction is closed, and the phases of the excitation pulse and the refocusing pulse are modulated. The main steps are as follows:

[0038] 1) The FSE sequence is used for pre-scanning, the phase encoding direction is turned off, each layer is scanned, and each layer is excited multiple times (generally no more than 4 times), and N echoes are collected for each excitation.

[0039] 2) Multiple excitations are performed by phase modulation of the excitation pulse and the refocusing pulse. During the multiple excitations, the initial phases of the excitation pulse and the refocusing pulse are different.

[0040] 3) Process the collected data, and the specific method will be described in the summary of the invention below.

[0041] 4) Through the previous phase modulation, the signals of the N echoes collected in the pre-scan are spin echoes or mixed signals of spin echoes an...

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PUM

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Abstract

The invention discloses a phase correction method of fast spin echo in a magnetic resonance imaging system and an application thereof. Fast spin echo (FSE) pulse sequences produce stimulated echoes due to the imperfection of RF refocusing pulses, which cause phase errors and produce artifacts. In order to eliminate this artifact, the present invention adopts the method of pre-scanning to make the position of the spin echo coincide with the position of the stimulated echo by gradient and adjusting the phase of the RF refocusing pulse, and eliminate the zero-order and first-order phase errors of FSE, thereby eliminating Artifacts caused by phase errors to improve image quality.

Description

technical field [0001] The invention belongs to the field of magnetic resonance imaging, and in particular relates to a phase correction method of fast spin echo in a magnetic resonance imaging system and an application thereof. Background technique [0002] Magnetic resonance imaging technology has become a commonly used technical means in modern medical diagnosis. Scanning with conventional magnetic resonance imaging sequence takes several minutes for a single scan. However, scanning with a fast imaging sequence will greatly shorten the time for a single scan. The fast spin echo pulse sequence has become the most commonly used sequence in the fast imaging sequence and is widely used in the magnetic resonance imaging system. Compared with the standard spin echo sequence, the scanning efficiency of the FSE sequence is greatly improved, which is about ETL (Echo Train Length) times of the standard spin echo sequence. However, due to the imperfection of the RF pulse, the FSE ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/565
Inventor 唐昕姜忠德陈铭明郭义超
Owner SUZHOU LONWIN MEDICAL SYST