scholarly journals A parallel imaging technique using mutual calibration for split-blade diffusion-weighted PROPELLER

2010 ◽  
Vol 65 (3) ◽  
pp. 638-644 ◽  
Author(s):  
Zhiqiang Li ◽  
James G. Pipe ◽  
Eric Aboussouan ◽  
John P. Karis ◽  
Donglai Huo
Keyword(s):  
Parallel Imaging ◽  
Imaging Technique ◽  
Parallel Imaging Technique ◽  
Diffusion Weighted

scholarly journals Joint reconstruction framework of compressed sensing and nonlinear parallel imaging for dynamic cardiac magnetic resonance imaging

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Zhanqi Hu ◽  
Cailei Zhao ◽  
Xia Zhao ◽  
Lingyu Kong ◽  
Jun Yang ◽  
...  
Keyword(s):  
Compressed Sensing ◽  
Parallel Imaging ◽  
Imaging Technique ◽  
Temporal Variations ◽  
Cine Mri ◽  
Reconstruction Process ◽  
Parallel Imaging Technique ◽  
In Vivo Experiments ◽  
Space Data

AbstractCompressed Sensing (CS) and parallel imaging are two promising techniques that accelerate the MRI acquisition process. Combining these two techniques is of great interest due to the complementary information used in each. In this study, we proposed a novel reconstruction framework that effectively combined compressed sensing and nonlinear parallel imaging technique for dynamic cardiac imaging. Specifically, the proposed method decouples the reconstruction process into two sequential steps: In the first step, a series of aliased dynamic images were reconstructed from the highly undersampled k-space data using compressed sensing; In the second step, nonlinear parallel imaging technique, i.e. nonlinear GRAPPA, was utilized to reconstruct the original dynamic images from the reconstructed k-space data obtained from the first step. In addition, we also proposed a tailored k-space down-sampling scheme that satisfies both the incoherent undersampling requirement for CS and the structured undersampling requirement for nonlinear parallel imaging. The proposed method was validated using four in vivo experiments of dynamic cardiac cine MRI with retrospective undersampling. Experimental results showed that the proposed method is superior at reducing aliasing artifacts and preserving the spatial details and temporal variations, compared with the competing k-t FOCUSS and k-t FOCUSS with sensitivity encoding methods, with the same numbers of measurements.

scholarly journals Fast Imaging Technique for fMRI: Consecutive Multishot Echo Planar Imaging Accelerated with GRAPPA Technique

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Daehun Kang ◽  
Yul-Wan Sung ◽  
Chang-Ki Kang
Keyword(s):  
Functional Imaging ◽  
Statistical Power ◽  
Parallel Imaging ◽  
Imaging Technique ◽  
Imaging Study ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Parallel Imaging Technique ◽  
Functional Imaging Study ◽  
Echo Planar

This study was to evaluate the proposed consecutive multishot echo planar imaging (cmsEPI) combined with a parallel imaging technique in terms of signal-to-noise ratio (SNR) and acceleration for a functional imaging study. We developed cmsEPI sequence using both consecutively acquired multishot EPI segments and variable flip angles to minimize the delay between segments and to maximize the SNR, respectively. We also combined cmsEPI with the generalized autocalibrating partially parallel acquisitions (GRAPPA) method. Temporal SNRs were measured at different acceleration factors and number of segments for functional sensitivity evaluation. We also examined the geometric distortions, which inherently occurred in EPI sequence. The practical acceleration factors,R=2orR=3, of the proposed technique improved the temporal SNR by maximally 18% in phantom test and by averagely 8.2% in in vivo experiment, compared to cmsEPI without parallel imaging. The data collection time was decreased in inverse proportion to the acceleration factor as well. The improved temporal SNR resulted in better statistical power when evaluated on the functional response of the brain. In this study, we demonstrated that the combination of cmsEPI with the parallel imaging technique could provide the improved functional sensitivity for functional imaging study, compensating for the lower SNR by cmsEPI.

ADC Measurement of Abdominal Organs and Lesions Using Parallel Imaging Technique

2006 ◽  
Vol 187 (6) ◽  
pp. 1521-1530 ◽  
Author(s):  
Takeshi Yoshikawa ◽  
Hideaki Kawamitsu ◽  
Donald G. Mitchell ◽  
Yoshiharu Ohno ◽  
Yonson Ku ◽  
...  
Keyword(s):  
Parallel Imaging ◽  
Imaging Technique ◽  
Parallel Imaging Technique ◽  
Abdominal Organs
Sign in / Sign up

Export Citation Format

Share Document