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. |