Table 1.
2SX/FXL modeling of agar T1ρ relaxation. Comparison of the model parameters obtained by fitting dispersion data or single relaxation decay curves. Dispersion data included rotating frame relaxation rates obtained at four different GOIA modulations as specified on the first raw. Single fit data represented the relaxation decay curve measured with one GOIA modulation (4ms, GOIA-W(16,4), gm = 0.9, B1max = 382 Hz) different from the previous four. The model parameters were: correlation time constant τc,b, exchange time constant τex, exchange chemical shift δωex, water bound fraction Pb.
| GOIA | 4ms, W(16,4), gm=0.6 | 4ms, W(8,4), gm=0.8 | 5ms, W(16,4), gm=0.9 | 6ms, W(16,4), gm=0.9 |
|---|---|---|---|---|
| B1max (Hz) | 640 | 510 | 305 | 255 |
| T1ρ (ms) | 90.04±7.05 | 87.69±7.40 | 80.38±9.19 | 79.02±8.59 |
| Model parameters | τc,b (ns) | τex (ms) | δωex (ppm) | Pb |
| Dispersion fit | 8.403±0.346 | 0.815±0.044 | 0.997±0.003 | 0.065±0.003 |
| Single fit | 9.429±2.301 | 0.827±0.063 | 1.034±0.006 | 0.063±0.006 |