Efficient Water Fat Separation Algorithm for Low Field Magnetic Resonance Imaging System

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Efficient Water Fat Separation Algorithm for Low Field Magnetic Resonance Imaging System

更新时间：2025-05-08

- Efficient Water Fat Separation Algorithm for Low Field Magnetic Resonance Imaging System
- Vol. 43, Issue 6, Pages: 52-56(2009)
- 作者机构：
  
  西安交通大学生物医学信息工程教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP391
- Online First：10 June 2009，
  
  Published：2009
- 稿件说明：
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Efficient Water Fat Separation Algorithm for Low Field Magnetic Resonance Imaging System[J]. 2009, 43(6): 52-56.
DOI：

Efficient Water Fat Separation Algorithm for Low Field Magnetic Resonance Imaging System[J]. 2009, 43(6): 52-56. DOI：

摘要

提出了一种基于Dixon算法的磁共振水脂分离成像改进方法.该方法分别采集人体组织中的水和脂肪同相位和反相位的磁共振图像

利用化学位移效应所产生的相位差分离出水和脂肪的图像.采用了改进的区域增长算法进行相位校正

为了在低场、较高噪声时获得更好的稳定性

为感兴趣区域和背景噪声分别开辟两类不同的多个堆栈

并设定感兴趣区域的增长优先级总是高于背景噪声

使得由背景噪声引起的误差传播被有效抑制.实验结果证明

改进算法在低场高噪声条件下比原算法更稳定

并在0.3 T低场永磁型磁共振系统上对水模、膝关节与人脑等部位获得了满意的水脂分离图像.

Abstract

An efficient method of water fat separation for the magnetic resonance imaging(MRI)is presented. Based on the Dixon algorithm

where in-phase and opposed phase images are acquired by spin echo(SE)sequence. From these images the water-only and fat-only images can be extracted following the chemical shift principle. To obtain better performance under high noise condition on the low field MRI system

two different types of multiple stacks are created respectively for object region and background region. Pixels in background regions always have an inferior priority during region growing

so the errors due tobackground noises are restrained effectively. The modified method is more robust

and experiments on 0.3 T system show the satisfying results.

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references

DIXON W T. Simple proton spectroscopic imaging [J]. Radiology, 1984, 153(1):189-194.

GLOVER G H, SCHNEIDE E. Three-point Dixon technique for true water/fat decomposition with B0 inhomogeneity correction [J]. Magnetic Resonance in Medicine, 1991, 18(2):371-383.

XIANG Q S, LI A. Water-fat imaging with direct phase encoding [J]. Magnetic Resonance Imaging, 1997,7(6):1002-1015.

MA J, SINGH S K, KUMAR A J, et al. Method for efficient fast spin echo Dixon imaging [J]. Magnetic Resonance in Medicine, 2002, 48(6):1021-1027.

MA Jingfei. Breath-hold water and fat imaging using a dual-echo two point Dixon technique with an efficient and robust phase-correction algorithm [J]. Magnetic Resonance in Medicine, 2004, 52(2):415-419.

MA Jingfei, Jong B S, Bankson J A, et al. A fast spin echo two-point Dixon technique and its combination with sensitivity encoding for efficient T2-weighted imaging [J]. Magnetic Resonance Imaging, 2005,23(10): 977-982.

SCHMIDT M A, FRASER K M. Two-point Dixon fat-water separation: improving reliability and accuracy in phase correction algorithms [J].Journal of Magnetic Resonance Imaging, 2008, 27(5):1122-1129.

SKINNER T E, GLOVER G H. An extended two-point Dixon algorithm for calculating separate water, fat and B0 images [J]. Magnetic Resonance in Medicine, 1997, 37(4): 628-630.

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