利用动态接收增益提高磁共振成像信噪比的方法

doi:10.11938/cjmr20140406

波谱学杂志 ›› 2014, Vol. 31 ›› Issue (4): 515-522.doi: 10.11938/cjmr20140406

利用动态接收增益提高磁共振成像信噪比的方法

孙宏宇¹, 汤伟男², 王为民^1*

1. 北京大学信息科学技术学院量子电子学研究所，北京100871;
2. 北京大学磁共振成像研究中心，北京100871

收稿日期:2014-04-16 修回日期:2014-11-04 出版日期:2014-12-05 发布日期:2014-12-05
通讯作者: 王为民 E-mail:wmw@pku.edu.cn
作者简介:孙宏宇(1988-)，男，黑龙江哈尔滨人，硕士研究生，无线电物理专业. *通讯联系人：王为民，电话：010-62765830，E-mail：wmw@pku.edu.cn.
基金资助:
国家科技重大专项资助项目(2011ZX05008-004).

Improving Signal-to-Noise Ratio in Magnetic Resonance Imaging Using Dynamic Receiver Gain

SUN Hong-yu¹，TANG Wei-nan²，WANG Wei-min^1*

1. Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China;
2. Center of Magnetic Resonance Imaging, Peking University, Beijing 100871, China

Received:2014-04-16 Revised:2014-11-04 Online:2014-12-05 Published:2014-12-05
About author:*Corresponding author：WANG Wei-min, Tel: +86-10-62765830, E-mail: wmw@pku.edu.cn.
Supported by:
国家科技重大专项资助项目(2011ZX05008-004).

摘要/Abstract

摘要：

提出了一种提高磁共振成像(MRI)信噪比的有效方法．该方法在每次采集回波信号前，能够快速、灵活地控制MRI 接收机的增益，实现磁共振信号动态范围的压缩；在图像重建之前采用双精度浮点运算扩展动态范围压缩的磁共振信号，最终得到信噪比提高的重建图像．在1.5 T 超导MRI 系统上进行了自旋回波序列的水模成像，实验结果表明，相比传统的基于固定接收增益的扫描图像，利用该方法得到的T1 加权图像信噪比可以提高10%．和其他提高磁共振信号动态范围的方法相比，该方法无需增加额外硬件电路，避免多次采集图像，因而具有实现成本低的优点，是一种提高MRI 信噪比的有效方法．

关键词: 磁共振成像(MRI), 动态接收增益, 量化噪声, 动态范围, 信噪比

Abstract:

A method to increase signal-to-noise ratio (SNR) in magnetic resonance imaging using dynamic receiver gain was proposed. In the method, the receiver gain was adjusted dynamically according to amplitude of each echo signal before acquisition. By doing so, the receiver dynamic range could be optimized to improve SNR of each acquisition. To reconstruct the images, a double-precision floating-point arithmetic processing procedure was used to expand the dynamic range of all acquisitions to the same scale. Imaging experiments were conducted using the proposed method on a 1.5 T clinical MRI scanner.
The results showed that the SNR of T1-weighted images could be improved by approximately 10%, compared to the fixed-receiver-gain images. More importantly, the method proposed needs no extra circuits or multiple time-consuming scans. It is concluded that using dynamic receiver gain for each acquisition is an effective way to improve SNR in MR imaging, especially for high-resolution and high-filed imaging applications.

Key words: MRI, dynamic receiver gain, quantization noise, dynamic range, signal-tonoise ratio

中图分类号:

O482.53

孙宏宇1，汤伟男2，王为民1*. 利用动态接收增益提高磁共振成像信噪比的方法[J]. 波谱学杂志, 2014, 31(4): 515-522.

SUN Hong-yu1，TANG Wei-nan2，WANG Wei-min1*. Improving Signal-to-Noise Ratio in Magnetic Resonance Imaging Using Dynamic Receiver Gain[J]. Chinese Journal of Magnetic Resonance, 2014, 31(4): 515-522.

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利用动态接收增益提高磁共振成像信噪比的方法

Improving Signal-to-Noise Ratio in Magnetic Resonance Imaging Using Dynamic Receiver Gain

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