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. 2016 Dec 18;(118):52352. doi: 10.3791/52352
Parameter Image Sequence
qMT DTI
General Sequence type 3D, MT-weighted gradient-recalled echo 2D, multi slice, single-shot spin-echo EPI
Preparation phases Receiver gain, center frequency, VOI shim Receiver gain, center frequency, VOI shim
Number of excitations 2 6
Total scan duration (min:sec) 10:41 6:28
Geometry Anatomical plane(s) Axial Axial
Number of slices 11 11
Slice thickness (mm) 7 7
Inter-slice gap (mm) 0 0
Acquired matrix 128 x 128 x 6 64 x 64
Reconstructed matrix 128 x 128 x1 128 x 128
Field of view (mm) 256 x 256 x 77 256 x 256
Reconstructed voxel size (mm) 2.00 x 2.00 x 7.00 2.00 x 2.00 x 7.00
Contrast Repetition time (ms) 50 4,000
MT pulse Nominal flip angles: 360°, 820°; Pulse width: 20ms; Frequency offsets: 1, 2, 5, 10, 20, 50, 100 kHz N/A
Diffusion weighting (b) (s•mm-2) N/A b=450; 15 directions + one b=0 image
Fat signal suppression (when used) 1331 binomial water-selective excitation Gradient reversal; Sinc-Gauss pre-pulse (90°, duration: 18 ms, frequency offset: 100 Hz)
Echo time (ms) 3.9 48
Number of echoes/ echo spacing (ms) N/A N/A
Excitation flip angle (°) 6 90
RF shimming Adaptive Adaptive
Signal acquisition Readout type Cartesian Cartesian
Parallel imaging SENSE (g=1.5) SENSE (g=1.5)
Bandwidth/pixel (Hz/pixel) 383 42.1