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Table 1 MR imaging sequences and parameters

From: Open-source, small-animal magnetic resonance-guided focused ultrasound system

Sequence Parameters Purpose
Gem TE = 6–15 ms Gradient echo sequence for PRF-shift thermometry.
  TR = 30 ms All monitoring was conducted in a single
  Angle = 25 slice in the MRI axial plane, parallel to the direction
  Mat = 96×96 of acoustic propagation. 1–2 dummy
  FOV = 60×60 mm scans were used to suppress steady-state artifacts.
Fsems TE = 37 ms  
  TR = 3000 ms Fast spin echo sequence for T 2-weighted anatomical
  ETL = 8 imaging. Enables tumor localization and visualization
  ESP = 9 ms of the surrounding environment.
  Angle = 20  
Mgems TE = 2 ms  
  ΔTE = 3 ms  
  TR = 30 ms Multi-echo gradient echo scan for water/fat separation
  Angle = 25 in post-treatment analysis.
  Mat = 96×96  
  FOV = 60×60 mm  
Gems_meg TE = 7.6 ms Modified gradient echo sequence for ARFI. G_dur
  TR = 71 ms represents the duration a single lobe of the biopolar
  G_amp = 10 G/cm MEG. The direction of motion encoding was
  G_dur = 4 ms controlled within the scanner interface based on
  FUS = 1.1 MHz the slice orientation.