scholarly journals Real-time geometric distortion correction for interventional imaging with echo-planar imaging (EPI)

2009 ◽  
Vol 61 (4) ◽  
pp. 994-1000 ◽  
Author(s):  
Iulius Dragonu ◽  
Baudouin Denis de Senneville ◽  
Bruno Quesson ◽  
Chrit Moonen ◽  
Mario Ries
Keyword(s):  
Real Time ◽  
Echo Planar Imaging ◽  
Distortion Correction ◽  
Geometric Distortion ◽  
Planar Imaging ◽  
Interventional Imaging ◽  
Echo Planar

The clinical potential of ultra-high-speed echo-planar imaging

1990 ◽  
Vol 333 (1632) ◽  
pp. 507-514 ◽  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Echo Planar Imaging ◽  
Lesion Detection ◽  
Whole Body ◽  
Planar Imaging ◽  
Cardiac Events ◽  
Ultra High Speed ◽  
Movement Artefact ◽  
Echo Planar

Ultra-high-speed echo-planar imaging (EP1) allows acquisition of a complete twodimensional image in 64 to 128 ms devoid of movement artefact and without sacrifice of contrast due to relaxation time effects. In conventional whole-body MRI, however, obtrusive movement artefact and extended imaging time, resulting from the need to apply multiple sequences to facilitate lesion detection and pathological characterization, remain limitations. Reduced total examination time increases patient tolerance and throughput • furthermore optimization of contrast to achieve maximal conspicuity of particular features in liver or brain pathology is achieved simply and interactively by real time adjustment of the imaging parameters. The method provides the opportunity to study in real time dynamic events such as flow phenomena in the vascular and cerebrospinal fluid compartments of the brain as well as the kinetics of administered contrast agents, EPI is the only means of capturing the irregular motion of aperiodic cardiac events and bowel peristalsis.

scholarly journals Susceptibility‐induced distortion correction in hyperpolarized echo planar imaging

2017 ◽  
Vol 79 (4) ◽  
pp. 2135-2141 ◽  
Author(s):  
Jack J. Miller ◽  
Angus Z. Lau ◽  
Damian J. Tyler
Keyword(s):  
Echo Planar Imaging ◽  
Distortion Correction ◽  
Planar Imaging ◽  
Echo Planar

scholarly journals EPI distortion correction for simultaneous human brain stimulation and imaging at 3T

2019 ◽  
Author(s):  
Hyuntaek Oh ◽  
Jung Hwan Kim ◽  
Jeffrey M. Yau
Keyword(s):  
Human Brain ◽  
Resting State ◽  
Network Architecture ◽  
Motor Behavior ◽  
Resting State Fmri ◽  
Echo Planar Imaging ◽  
Distortion Correction ◽  
Planar Imaging ◽  
Brain Scans ◽  
Echo Planar

AbstractTranscranial magnetic stimulation (TMS) can be paired with functional magnetic resonance imaging (fMRI) in simultaneous TMS-fMRI experiments. These multimodal experiments enable causal probing of network architecture in the human brain which can complement alternative network mapping approaches. Critically, merely introducing the TMS coil into the scanner environment can sometimes produce substantial magnetic field inhomogeneities and spatial distortions which limit the utility of simultaneous TMS-fMRI. We assessed the efficacy of point spread function corrected echo planar imaging (PSF-EPI) in correcting for the field inhomogeneities associated with a TMS coil at 3T. In phantom and brain scans, we quantitatively compared the coil-induced distortion artifacts measured in PSF-EPI scans to artifacts measured in conventional echo-planar imaging (EPI) and a simultaneous multi-slice sequence (SMS)-EPI. While we observed substantial coil-related artifacts in the data produced by the conventional EPI and SMS sequences, PSF-EPI produced data that had significantly greater signal-to-noise and less distortions. In phantom scans with the PSF-EPI sequence, we also characterized the temporal profile of dynamic artifacts associated with TMS delivery and found that image quality remained high as long as the TMS pulse preceded the RF excitation pulses by at least 50ms. Lastly, we validated the PSF-EPI sequence in human brain scans involving TMS and motor behavior as well as resting state fMRI scans. Our collective results demonstrate the superiority of PSF-EPI over conventional EPI and SMS sequences for simultaneous TMS-fMRI when coil-related artifacts are a concern. The ability to collect high quality resting state fMRI data in the same session as the simultaneous TMS-fMRI experiment offers a unique opportunity to interrogate network architecture in the human brain.

Real-time flow measurements using echo-planar imaging

1991 ◽  
Vol 18 (1) ◽  
pp. 1-8 ◽  
Author(s):  
D. N. Guilfoyle ◽  
P. Gibbs ◽  
R. J. Ordidge ◽  
P. Manwield
Keyword(s):  
Real Time ◽  
Echo Planar Imaging ◽  
Planar Imaging ◽  
Flow Measurements ◽  
Time Flow ◽  
Echo Planar
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