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Dear expert

We are planning multi-center study with the hearing impaired patients using FreeSurfer.
The signal-to-noise ratio (SNR) of the test MRI from a center does not look very good, but the FreeSurfer can analyze the gray matter.
How much the allowable SNR for FreeSurfer analysis?

This is the MRI protocol and the test image.

Thank you in advance.

Shujiro

test image.png

Siemens MAGNETOM Altea 1.5T  
Voxel size1.0X1.0X1.0mm3
Geometry　
FOV256mm(256X256 matrix)
Slice176
Orientationsagittal
Slice thickness1mm 
Phase Encoding DirA→P
Timing　
TR2730
TI1100
TE1.64/3.59/5.36/7.31
bandwidth651
RF　
Magn.PreparationNon-sel.IR
FA7°
Acceleration GRAPPA　
Acceleration Factor PE2
Reference Line PE32
Slice Partial fourier6/8
ScanTime6:08


Shujiro Minami M.D., Ph.D.
Dpt. of Otolaryngology National Tokyo Medical Center
2-5-1 Higashigaoka, Meguro, Tokyo 152-8902, Japan
E-mail shujirominami@me.com