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Table 1: High- and low-SAR FSTIR sequence parameters for presurgical planning or postsurgical MR imaging assessment of DBS recipients with Parkinson disease^{^a}
Pulse Sequence TR/TE/TI/Matrix/Scan Time (min) Section Thickness/FOV/No. of Avg/No. of Sections Echo-Train/BW (kHz) Refocusing Pulse Width (Default Value)/Refocusing Pulse Flip Angles in FSTIR Whole-Head SAR (W/kg) (Estimated)
High-SAR 2D Ax FSTIR (PD+T1w)^{^b} 4s/12 ms/140 ms/256 × 192/5:30 3 mm/24 cm/2/30 8/ ± 15.8 1.6 ms (1.6 ms)/180⁰ 1.5
Low-SAR 2D Ax FSTIR (PD+T1w)^{^b} 10–13 s/11–13 ms/130 ms/256 × 192/7:10–8:30 3 mm/24 cm/1/24–32 (Interleave) 10/ ± 15.8 2.6 ms (1.6)/first = 110⁰, second = 100⁰, rest of the refocusing angles = 110⁰ ≤0.1
Note:—BW indicates bandwidth; T1w, T1-weighted; Avg, average; Ax, axial.
↵a Magnet strength, 1.5T; RF coil: transmit-receive 1-channel head coil.
↵b Short Tau FSTIR produces T1-weighted for short T1 tissues (fat, white matter darker, close to null) and proton density (PD) weighting for long T1 tissues (CSF, gray matter brighter, far away from null).