Scalable multichannel MRI data acquisition system
Scalable multichannel MRI data acquisition system
复制标题
DOI：
10.1002/mrm.10693
复制
发表时间：
2004-01-01
影响因子：
3.3
通讯作者：
Duyn, JH
中科院分区：
文献类型：
--
作者：
Bodurka, J;Ledden, PJ;Duyn, JH
设计了一种可扩展的多通道数字MRI接收系统，用于实现诸如BOLD-fMRI等应用的高带宽回波平面成像（EPI）采集。模块化系统设计允许轻松扩展到任意数量的通道。开发了一种16通道接收器，并与通用电气（GE） Signa 3T VH/3临床扫描仪集成。使用定制的16单元仅接收脑表面线圈阵列，对幻影和人类志愿者的接收器性能进行了评估。在1 MHz的输出带宽下，实现了100%的采集占空比。系统总体噪声系数和动态范围分别优于0.85 dB和84 dB。在幻影上重复EPI扫描时，图像强度时间过程的相对时间标准偏差小于0.2%。与鸟笼头线圈相比，使用定制阵列的16通道接收在大脑皮层产生近6倍的信噪比增益，在大脑中心产生1.8倍的信噪比增益。优异的系统稳定性，加上16通道线圈的灵敏度和感应能力的提高，预计将大大有利于和增强功能磁共振成像的应用。2003年Wiley-Liss出版（匕首）。
A scalable multichannel digital MRI receiver system was designed to achieve high bandwidth echo-planar imaging (EPI) acquisitions for applications such as BOLD-fMRI. The modular system design allows for easy extension to an arbitrary number of channels. A 16-channel receiver was developed and integrated with a General Electric (GE) Signa 3T VH/3 clinical scanner. Receiver performance was evaluated on phantoms and human volunteers using a custom-built 16-element receive-only brain surface coil array. At an output bandwidth of 1 MHz, a 100% acquisition duty cycle was achieved. Overall system noise figure and dynamic range were better than 0.85 dB and 84 dB, respectively. During repetitive EPI scanning on phantoms, the relative temporal standard deviation of the image intensity time-course was below 0.2%. As compared to the product birdcage head coil, 16-channel reception with the custom array yielded a nearly 6-fold SNR gain in the cerebral cortex and a 1.8-fold SNR gain in the center of the brain. The excellent system stability combined with the increased sensitivity and SENSE capabilities of 16-channel coils are expected to significantly benefit and enhance fMRI applications. Published 2003 Wiley-Liss, lnc.(dagger).