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Method for obtaining high-quality in-phase and out-phase images of abdomen and magnetic resonance imaging system applying method

A technique for magnetic resonance imaging, inverse phase

Active Publication Date: 2017-05-31
SUZHOU LONWIN MEDICAL SYST
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  • Claims
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Problems solved by technology

This sequence is suitable for breath-hold scanning, and its imaging quality is limited by the patient's cooperation, which has certain limitations; the steady-state precession fast imaging sequence is often used to create a contrast between liquid and soft tissue, and the contrast between soft tissues is very poor. Not suitable for examination of solid lesions inside solid organs

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  • Method for obtaining high-quality in-phase and out-phase images of abdomen and magnetic resonance imaging system applying method

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Embodiment

[0020] Embodiment: A kind of method of obtaining high-quality abdominal anti-phase image, adopts turbo-FLASH double-echo sequence, combines the method for obtaining abdominal anti-phase image with respiratory gating technology, main steps are as follows:

[0021] 1) Before the FLASH sequence is applied, apply a 180° excitation pulse to pre-prepare the magnetic moment;

[0022] Among them, the object is the scanning layer, that is, the layer where the data is currently acquired; the magnetic resonance 2D image is composed of n slice layers, and the object of the 180° excitation pulse here is the current scanning slice layer;

[0023] 2) A phase-scrambled GRE sequence with small angle and short TR applied after TI time;

[0024] Wherein, the TI is the inversion recovery time, which is defined as the time interval from the midpoint of the 180° inversion pulse to the midpoint of the excitation pulse;

[0025] 3) Collect the complete data of one layer of image;

[0026] 4) Traver...

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Abstract

The invention discloses a method for obtaining high-quality in-phase and out-phase images of an abdomen and a magnetic resonance imaging system applying the method. The method for obtaining the high-quality in-phase and out-phase images of the abdomen, provided by the invention, is characterized in that a turbo-FLASH double-echo sequence is adopted and signal acquisition is carried out by adopting a free breathing manner; meanwhile, the invention further provides the magnetic resonance imaging system for obtaining the high-quality in-phase and out-phase images of the abdomen by applying the method; the method and the magnetic resonance imaging system are adopted and the problems that a stimulation angle is relatively large and the recovery time is relatively long so that only breath-holding scanning can be carried out in clinic are solved; the magnetic resonance imaging system is applicable to diagnosis and identification of adrenal lesions, fatty liver, liver focal intralesional fatty degeneration and kidney or liver angiomyolipoma and has a very high clinical application value.

Description

technical field [0001] The invention belongs to the field of magnetic resonance imaging, and in particular relates to a method for obtaining high-quality images of the same and opposite phases of the abdomen and a magnetic resonance imaging system using the same. Background technique [0002] In phase / out of phase imaging is also called chemical shift imaging. At present, in clinical practice, the same and reversed phase imaging technology has been more and more widely used. The technique is based on the chemical shift effect of protons in fat and water molecules. Due to the difference in molecular structure, the magnetic field intensity felt by protons in fat is slightly lower than that of protons in water molecules under the same field strength, resulting in the precession frequency of protons in fat is lower than that of protons in water molecules, the difference is about 3.5PPM, that is 147Hz / T. In the process of magnetic resonance imaging, after radio frequency excit...

Claims

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Application Information

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IPC IPC(8): G06T7/00A61B5/055
CPCA61B5/055G06T7/0012G06T2207/10088G06T2207/20056
Inventor 陈铭明张树林李鹏宇
Owner SUZHOU LONWIN MEDICAL SYST