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. 2017 Nov 27;39(2):1015–1023. doi: 10.1002/hbm.23900

Table 2.

DTI sequence parameters for Centre for Addiction and Mental Health (CAMH), Maryland Psychiatric Research Center (MPRC), and Zucker Hillside Hospital (ZHH) sites

CAMH MPRC ZHH
MRI system GE MR750 Discovery Siemens Trio GE HDx
Year of Installation 2010 2011 2004
Head Coil 8‐channel 12‐channel 8‐channel
Acceleration Asset=2 GRAPPA=2 Asset=2
Echo Time (ms) 88 85 88
Repetition Time (ms) 8,800 8,800 17,000
Flip Angle (degrees) 90/180/180 90/180 90/180/180
FOV (mm) 256 256 256
In‐plane resolution (mm) 2.0 × 2.0 2.0 × 2.0 2.0 × 2.0
Slice Thickness (mm) 2.0 2.0 2.0
Number of Slices 66 66 66

Partial k‐space acceleration techniques, Array Spatial Sensitivity Encoding Technique (Asset), and Generalized Autocalibrating Partially Parallel Acquisitions (GRAPPA) were used on GE and Siemens scanners, respectively, to reduce effective TE and TE by undersampling k‐space along the phase encoding direction. A twice refocused spin‐echo EPI sequence was used on the GE scanners to improve spatial distortions. A refocused monopolar EPI sequence was used on the Siemens scanner to improve SNR.