Dalal Ishaan L, Kirpalani Ashwin L, Fontaine Fred L
Dept. of Electr. Eng., Cooper Union, New York, NY 10003, USA.
Conf Proc IEEE Eng Med Biol Soc. 2006;2006:1897-900. doi: 10.1109/IEMBS.2006.260524.
Commercial receivers used for parallel MR imaging often present researchers with hurdles such as high cost-per-channel, low scalability for multiple coils and non-accessibility to intermediate data for research. A novel low-cost multichannel digital receiver for use with MR scanners has been developed to alleviate these concerns. MR signals from up to 16 coils are bandpass sampled at RF, with all subsequent downconversion performed on a single-chip Field-Programmable Gate Array (FPGA). Downconverted information is buffered and can be downloaded over a network or onto flash memory for image reconstruction. Arrays with more than 16 coils can easily scale by using more than one of these economical receivers. A 2-channel prototype has been designed, built and tested successfully with a combination of real-world signals and simulated MR data.
用于并行磁共振成像的商用接收器常常给研究人员带来诸多障碍，比如每通道成本高昂、多线圈的可扩展性低以及无法获取中间数据用于研究。为了缓解这些问题，已开发出一种用于磁共振扫描仪的新型低成本多通道数字接收器。来自多达16个线圈的磁共振信号在射频处进行带通采样，所有后续的下变频操作在单片现场可编程门阵列（FPGA）上执行。下变频后的信息被缓冲，并且可以通过网络下载或存储到闪存中用于图像重建。使用多个这种经济实惠的接收器，超过16个线圈的阵列可以轻松实现扩展。已成功设计、构建并测试了一个两通道原型，该原型结合了实际信号和模拟磁共振数据。
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