Assessment of the Impact of Turbo Factor on Image Quality and Tissue Volumetrics in Brain Magnetic Resonance Imaging Using the Three-Dimensional T1-Weighted (3D T1W) Sequence

Table 1

MRI scan parameters used for imaging.

Parameters	FreeSurfer equivalent protocol	Optimized protocol
Sequence	3D_T1W_TFE SENSE	3D_T1W_TFE SENSE
Voxel size (mm^3)
FA (^o)	7	7
TE (ms)	3.4	3.5
TR (ms)	7.6	7.5
Matrix size (mm^2)		244 x 200
FOV (mm^3)
Number of slices	145	145
Slice gap (mm)	0	0
Slice orientation	Sagittal	Sagittal
NSA	1	1
Acquisition WFS (pixel)/BW(Hz)	1.003/191.5	1.001/217
Acceleration factor (, )

FA: flip angle; TE: echo time; TR: repetition time; FOV: field of view; NSA: number of signal averages; WFS: water fat shift; : phase encoding; : slice encoding.