%0 Journal Article
%T Measuring Gradient Waveform on Low-Field MRI Systems with a Digital Receiver<br>在低场MRI系统中用数字接收机测量梯度波形的方法
%A WANG He
%A REN Jie-jing
%A NING Rui-peng
%A LI Geng-ying
%A <br>王鹤
%A 任洁静
%A 宁瑞鹏
%A 李鲠颖
%J 波谱学杂志
%D 2007
%I 
%X A method was proposed to measure the gradient waveform on low-field MRI systems with a digital receiver. The principles underlying such a method were discussed in detail. A variable gain amplifier was used in the digital receiver to modulate the amplitude of RF signal according to the audio-frequency (AF) signal. The performance of the digital receiver was tested and evaluated. It was shown that fitting the gradient waveforms measured with the digital receiver could result in correct pre-emphasis parameters, as demonstrated by evidently reduced eddy currents.
%K MRI
%K eddy current
%K gradient waveform measurement
%K digital receiver<br>磁共振成像
%K 涡流
%K 梯度波形测量
%K 数字接收机
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=1A3C8C6E452BD1AF5A6B6B99BA3989C9&aid=02F29EA56629D4C4&yid=A732AF04DDA03BB3&vid=B91E8C6D6FE990DB&iid=38B194292C032A66&sid=C6EC7357BCACD3A4&eid=9DC563A0FEFC04F9&journal_id=1000-4556&journal_name=波谱学杂志&referenced_num=0&reference_num=9