Parallel imaging methods for phased array MRI  

作　　者：ZHANG Bida, WANG Weidong, SONG Xiaoyu, ZU Donglin, CHEN Guangfei and BAO Shanglian(1. Institute of Heavy Ion Physics, the Research Center for Tumor Diagnosis and Therapeutical Physics, the Beijing Key Laboratory of Medical Physics & Engineering, Peking University, Beijing 100871, China 2. General Hospital of PLA, Beijing 100085, China) 

出　　处：《Progress in Natural Science:Materials International》2003年第4期307-310,共4页自然科学进展·国际材料（英文版）

基　　金：Supported by the National Natural Science Foundation of Beijing (Grant No. 3011002) and the Key Program of the Tenth Five-Year Plan of the Ministry of Science and Technology (2001BA706B02)

摘　　要：Two parallel methods for magnetic resonance tmaging (MRI) using radio frequency (RF) phased array surface coiks, named spatial loca! Fourier encoding (SLFE) and spatial RF encoding (SRFE), are presented. The MR signals are acquired from separate channels across the coils, each of which covers a sub-FOV (field-of-view) in a parallel fashion, and the acquired data are combined to form an image of entire FOV. These two parallel encoding techniques can accelerate MR imaging greatly, yet associated artifact rnay appear, al-though the SLFE is an effective image reconstruction method which can reduce the localized artifact in some degrees. By the SRFE, RF coil array can be utilized for spatial encoding through a specialized coil design. The images are acquired in a snapshot with a high signal-to-noise ratio (SNR) without the costly gradient system, resulting in great saving of cost. Both mutual induction and aliasing effect of adja-cent coils are critical to the success of SRFE. The strategies of inverse source problem and wavelet transform (WT) can be employed to e-Hminate them. The results simulated by MATLAB are reported.Two parallel methods for magnetic resonance imaging (MRI) using radio frequency (RF) phased array surface coils, named spatial local Fourier encoding (SLFE) and spatial RF encoding (SRFE), are presented. The MR signals are acquired from separate channels across the coils, each of which covers a sub-FOV (field-of-view) in a parallel fashion, and the acquired data are combined to form an image of entire FOV. These two parallel encoding techniques can accelerate MR imaging greatly, yet associated artifact may appear, although the SLFE is an effective image reconstruction method which can reduce the localized artifact in some degrees. By the SRFE, RF coil array can be utilized for spatial encoding through a specialized coil design. The images are acquired in a snapshot with a high signal-to-noise ratio (SNR) without the costly gradient system, resulting in great saving of cost. Both mutual induction and aliasing effect of adjacent coils are critical to the success of SRFE. The strategies of inverse source problem and wavelet transform (WT) can be employed to eliminate them. The results simulated by MATLAB are reported.

关 键 词：MRI RADIOFREQUENCY phased-array. 

分 类 号：TN957.52[电子电信—信号与信息处理]