FSE streak artifact - Githubissues

leoliuf / MRiLab

A Numerical Magnetic Resonance Imaging (MRI) Simulation Platform

https://leoliuf.github.io/MRiLab/

BSD 2-Clause "Simplified" License

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FSE streak artifact #33

Closed IgnacioGit404 closed 5 years ago

IgnacioGit404 commented 5 years ago

Hi,

I've been having difficulties simulating an FSE sequence with images coming out looking very 'streaky' e.g. below. They seem to maintain only the high frequency information.

Steaky

I was wondering what this might be due to? My current parameters are: ResFreqxResPhase: 448 x 290 FOVFreqxFOVPhase: 23x20 cm FlipAng: 90 TE: 96ms TR: 5420ms B0: 1.5T

FSE_ShotNum: 29 FSE_ETL: 10 FSE_ESP: 10e-3

CV1: 1e-3 CV2: 3e-3

leoliuf commented 5 years ago

Your simulated image resolution must be equal to or lower than the phantom in-plane resolution in order to avoid this artifact due to digitization.

IgnacioGit404 commented 5 years ago

I was desperately trying to think of a physical reason why this might happen and completely overlooked that digitization might be a cause!

Many thanks