Arjen Lindenholz

86 CHAPTER 4 Table 1. Scan parameters of the acquired scan variants T 1W VISTA variant 1 PD W VISTA variant 2 A T 1W VIRTA variant 3 B T 1W VIRTA variant 4 T 1W VISTA variant 5 C T 1W VISTA variant 6 T 1W VIRTA variant 7 Scan duration (min) 8:24 7:50 6:42 6:01 5:52 5:49 4:39 TR/TE (ms) 1500/38 2000/40 1500/37 1500/40 1500/40 1500/38 1500/40 Field-of-View (mm 3 ) 200x166x45 200x166x45 200x166x45 200x166x45 200x166x45 200x166x45 200x166x45 Acquired voxel (mm 3 ) 0.5x0.5x0.5 0.5x0.5x0.5 0.6x0.6x1.0 0.5x0.5x1.0 0.5x0.5x0.5 0.6x0.6x0.6 0.5x0.5x1.0 Reconstructed voxel (mm 3 ) 0.5x0.5x0.5 0.5x0.5x0.5 0.5x0.5x0.5 0.5x0.5x0.5 0.5x0.5x0.5 0.6x0.6x0.6 0.5x0.5x0.5 Oversample factor 1.8 1.2 1.8 1.8 1.2 1.8 1.8 SENSE reduction factor 1.5 2 1.5 2 2 1.5 2 Overcontiguous slices No (90) No (90) Yes (90) Yes (90) No (90) No (75) Yes (90) TSE + startup echoes 56+3 60+5 56+5 56+5 60+5 56+4 56+5 Turbo direction radial radial Y radial radial radial radial Refocusing control (α min / α max ) 30/120 50/120 25/120 50/120 50/120 30/120 50/120 Readout bandwidth (Hz) 607,6 358,6 732,1 360,1 358,6 753 360,1 Reference tissue T 1 /T 2 (ms) 1200/80 1200/100 1200/100 1200/100 1200/100 1200/80 1200/100 Anti-DRIVE yes no yes no no yes yes Elliptical k -space shutter yes yes no no yes yes yes A . Adjusted from Qiao et al. 19 B . Currently used in our clinic C. Adjusted from Qiao et al. 19 with a shorter TR. VISTA = volumetric isotropic turbo spin echo acquisition, VIRTA = volumetric isotropically reconstructed turbo spin echo acquisition, PD = proton density, SENSE = SENSitivity Encoding