Hu Houchun H, Madhuranthakam Ananth J, Kruger David G, Glockner James F, Riederer Stephen J
Magnetic Resonance Imaging Laboratory, Department of Radiology, Mayo Clinic College of Medicine, 200 1st Street S.W., Rochester, Minnesota 55905, USA.
Magn Reson Med. 2006 Jan;55(1):16-22. doi: 10.1002/mrm.20742.
Sensitivity encoding (SENSE) and partial Fourier (PF) techniques both reduce MRI acquisition time. Two-dimensional SENSE uses coil sensitivities to unfold aliasing in the phase/slice-encoding plane. One-dimensional PF and homodyne reconstruction are routinely applied in the frequency/phase-encoding plane to compensate for nonsampled k-space of the presumed real magnetization. Recently, a modified 3D elliptical centric acquisition was proposed to facilitate 2D-PF and homodyne reconstruction on an undersampled phase/slice-encoding plane. In this work we hypothesized that this 2D-PF technique can be combined with 2D-SENSE to achieve a greater acceleration factor than what each method can provide separately. Reconstruction of data whereby SENSE and PF are applied along the same axes is described. Contrast-enhanced MR angiography (CE-MRA) results from experiments using four receiver coils in phantom and volunteer studies are shown. In 11 volunteer studies, the SENSE-PF-homodyne technique using sevenfold acceleration (4x SENSE, 1.7x PF) consistently provided high-diagnostic-quality images with near 1-mm isotropic resolution in acquisition times of <20 s.
灵敏度编码（SENSE）和部分傅里叶（PF）技术都能缩短磁共振成像（MRI）采集时间。二维SENSE利用线圈灵敏度来展开相位/层面编码平面中的混叠。一维PF和零差重建通常应用于频率/相位编码平面，以补偿假定真实磁化的未采样k空间。最近，有人提出一种改进的三维椭圆中心采集方法，以便在欠采样的相位/层面编码平面上实现二维PF和零差重建。在本研究中，我们假设这种二维PF技术可与二维SENSE相结合，以实现比每种方法单独应用时更高的加速因子。本文描述了沿相同轴应用SENSE和PF的数据重建方法。展示了在体模和志愿者研究中使用四个接收线圈进行对比增强磁共振血管造影（CE-MRA）的实验结果。在11项志愿者研究中，使用七倍加速（4倍SENSE，1.7倍PF）的SENSE-PF-零差技术在<20秒的采集时间内始终能提供具有近1毫米各向同性分辨率的高诊断质量图像。
