磁共振成像相阵控线圈及并行成像技术

Phased array coil and parallel imaging technology of MRI

磁共振并行成像技术是近几年发展起来的最新技术,它是以多通道相阵控线圈为基础。SMASH技术是以同时采集相阵控线圈的不同空间敏感度的线性组合信号,这种线性组合来减少相位编码,减少成像时间。SENSE技术,通过增加k空间中采样的步距,即减少相位编码的采样步数,使成像速度加快。设计相阵控线圈要考虑谐振频率,阻抗匹配,互阻抗等问题。

The parallel imaging technology of MRI is the latest technique emerging in the last few years, which is based on the phased array coil. SMASH procedure operates by simultaneously acquiring linear combination signals with different spatial sensitivities from the phased array coils to reduce the phase encoding and shorten the imaging time. SENSE procedure operates by increasing the pace when sampling is performed in k-space, which proves a speedup by reducing the number of encoding steps. When the phased array coil designed, such problems have to be taken into account as resonant frequency, impedance match, mutual impedance and et al.