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.

scholarly journals Simultaneous Multislice Echo Planar Imaging With Blipped Controlled Aliasing in Parallel Imaging Results in Higher Acceleration

2015 ◽  
Vol 50 (7) ◽  
pp. 456-463 ◽  
Author(s):  
Lukas Filli ◽  
Marco Piccirelli ◽  
David Kenkel ◽  
Roman Guggenberger ◽  
Gustav Andreisek ◽  
...  
Keyword(s):  
Parallel Imaging ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Imaging Results ◽  
Simultaneous Multislice ◽  
Echo Planar

scholarly journals Improvements in parallel imaging accelerated functional MRI using multiecho echo-planar imaging

2010 ◽  
Vol 63 (4) ◽  
pp. 959-969 ◽  
Author(s):  
Heiko Schmiedeskamp ◽  
Rexford D. Newbould ◽  
Laura J. Pisani ◽  
Stefan Skare ◽  
Gary H. Glover ◽  
...  
Keyword(s):  
Functional Mri ◽  
Parallel Imaging ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Echo Planar

scholarly journals Blipped-controlled aliasing in parallel imaging for simultaneous multislice echo planar imaging with reduced g -factor penalty

2011 ◽  
Vol 67 (5) ◽  
pp. 1210-1224 ◽  
Author(s):  
Kawin Setsompop ◽  
Borjan A. Gagoski ◽  
Jonathan R. Polimeni ◽  
Thomas Witzel ◽  
Van J. Wedeen ◽  
...  
Keyword(s):  
Parallel Imaging ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
G Factor ◽  
Simultaneous Multislice ◽  
Echo Planar

scholarly journals Prediction of Esophageal Varices in Patients with Cirrhosis: Usefulness of Three-dimensional MR Elastography with Echo-planar Imaging Technique

Radiology ◽  
2014 ◽  
Vol 272 (1) ◽  
pp. 143-153 ◽  
Author(s):  
Sung Ui Shin ◽  
Jeong-Min Lee ◽  
Mi Hye Yu ◽  
Jeong Hee Yoon ◽  
Joon Koo Han ◽  
...  
Keyword(s):  
Esophageal Varices ◽  
Imaging Technique ◽  
Three Dimensional ◽  
Echo Planar Imaging ◽  
Mr Elastography ◽  
Planar Imaging ◽  
Echo Planar

scholarly journals Segmented K-Space Blipped-Controlled Aliasing in Parallel Imaging (Skipped-CAIPI) for High Spatiotemporal Resolution Echo Planar Imaging

2020 ◽  
Author(s):  
Rüdiger Stirnberg ◽  
Tony Stöcker
Keyword(s):  
High Resolution ◽  
Parallel Imaging ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Signal To Noise ◽  
Spatiotemporal Resolution ◽  
High Spatiotemporal Resolution ◽  
Selective Approach ◽  
Echo Planar ◽  
Phase Encode

AbstractPurposeA segmented k-space blipped-CAIPI (skipped-CAIPI) sampling strategy for echo planar imaging (EPI) is proposed, which allows for a flexible choice of EPI factor and phase encode bandwidth independent of the controlled aliasing (CAIPIRINHA) pattern.Theory and MethodsWith previously proposed approaches, exactly two EPI trajectories were possible given a specific CAIPIRINHA pattern: either with slice gradient blips (blipped-CAIPI), or following a shot-selective approach (higher resolution). Recently, interleaved multi-shot segmentation along shot-selective CAIPI trajectories has been applied for high-resolution anatomical imaging. For more flexibility and a broader range of applications, we propose segmentation along any blipped-CAIPI trajectory. Thus, all EPI factors and phase encode bandwidths available with traditional segmented EPI can be combined with controlled aliasing.ResultsTemporal signal-to-noise ratios of moderate-to-high-resolution time series acquisitions at varying undersampling factors demonstrate beneficial sampling alternatives to blipped-CAIPI or shot-selective CAIPI. Rapid high-resolution scans furthermore demonstrate SNR-efficient and motion-robust structural imaging with almost arbitrary EPI factor and minimal noise penalty.ConclusionsSkipped-CAIPI sampling increases protocol flexibility for high spatiotemporal resolution EPI. In terms of signal-to-noise ratio and efficiency, high-resolution functional or structural scans benefit vastly from a free choice of the CAIPIRINHA pattern. Even at moderate resolutions, the independence of sampling pattern, echo time and image matrix size is valuable for optimized functional protocol design. Although demonstrated with 3D-EPI, skipped-CAIPI is also applicable with simultaneous multislice EPI.

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