Table 1:

Protocols of MR image acquisition

ProtocolMRI systemRF coilTR (ms)TE (ms)TI (ms)Voxel size (mm)Flip angle
1TrioQuadrature knee25004.3811000.5 × 0.5 × 0.512
2TimTrioQuadrature knee (Tim)25003.8611000.5 × 0.5 × 0.512
3Trio8-Channel knee array25004.3811000.5 × 0.5 × 0.512
4TrioTim15-Channel knee array25003.8611000.5 × 0.5 × 0.512
  • RF, Radiofrequency. As indicated in the table, the ONPRC MRI system was upgraded throughout the study and different RF coils were used to enhance the signal-to-noise ratio. The parameters of MR image acquisition were adjusted accordingly.