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Table 1 Scan parameters of conventional and SMS scans

From: Simultaneous multi-slice MR imaging of the hip at 3 T to reduce acquisition times and maintain image quality

  Conventional SMS
PDW T1W FS-T2W PDW T1W FS-T2W
AT 4:36 3:42 3:58 2:22 2:17 2:56
Total AT 12:16 7:35
TR (ms) 2000 712 3500 2000 650 3500
TE (ms) 20 27 61 21 14 62
Averages 1 2 2 1 1 2
Concatenations 2 3 2 1 2 1
Flip angle (deg) 150 120 150 150 120 150
Fat suppression none none CHESS none none CHESS
Base resolution 320 384 320 320 384 320
Phase resolution (%) 100 75 70 100 75 70
Parallel imaging none GRAPPA GRAPPA CAIPIRINHA CAIPIRINHA CAIPIRINHA
Acceleration factor phase 2 2 1 1 1
Acceleration factor slice 2 2 2
FOV shift factor 2 2 2
Bandwidth (Hz/Px) 240 250 220 240 250 279
  1. PDW proton-density weighted, T1W T1-weighted, FS-T2W fat-saturated T2-weighted, SMS simultaneous multi-slice, AT acquisition time, TR repetition-time, TE echo time, GRAPPA generalized auto calibrating partially parallel acquisitions, CAIPIRINHA controlled aliasing in parallel imaging results in higher acceleration, CHESS chemical shift selective, FOV field-of-view