Table 2. The setting of varying image acquisition parameters and their theoretical effects on MR images.

Image acquisition parameters	Theoretical effects	Values
Echo time TE (ms)	To affect the decay of transverse magnetization and thus the T2-weighting of MR image	190, 206 (baseline), 220, 240, 260, 280, 300, 320, 340
Repetition time TR (ms)	To affect the recovery of longitudinal magnetization and thus the T2-weighting of MR image	2,100 (baseline), 600–3,000 with an increment of 200
Echo Train Length ETL	To accelerate scan by acquiring multiple spin echoes in a single TR; it also affects image artifacts such as blurring	50, 60, 70, 80, 90, 100, 110, 120, 134 (baseline), 140, 150
Number of startup RF pulse	To saturate short T2 structures in the MR image	4, 6 (baseline), 8, 10
Phase encoding direction	To affect scan efficiency and artifact appearance direction like motion ghosting	RL (baseline), AP
Turbo direction	To control the K-space trajectory during echo train acquisition.	phase encoding (baseline), radial
RF pulse train flip angle pattern (TE=186ms except for baseline and T2 Spine View)	To modulate MRI signal evolution during the echo train so as to optimize image T2-weighing for specific organs	T2 Brain View (baseline, TE =206 ms), T2 Brain view, T2 Spine View (TE =309 ms), T2 MSK View, T2FS MSK View, T2 Female Pelvis View, T2 General Pelvis View, T2 Prostate View
Driven equilibrium	To accelerate the recovery of longitudinal magnetization	Yes (baseline), No
Partial Fourier YZ (Y: phase-encoding direction; Z: slice-encoding direction)	To accelerate scan by collecting less K-space data but may introduce additional artifact and reduce SNR	NO (baseline, Y1Z1, NSA =2), Y0.6Z0.7 (NSA =6), Y0.8Z0.8 (NSA =5), Y0.8Z1 (NSA =3), Y1Z0.6 (NSA =5), Y1Z0.8 (NSA =3)

ms, millisecond; RF, radiofrequency; RL, right-left; AP, anterior-posterior; SNR, signal-to-noise ratio.