Background
Implementation
Supported signal models | ||
---|---|---|
Supported sequences | 3-parameter fit model | 2-parameter fit model |
T1 spin-echo IR (magnitude images) | S(t) = |A (1 − B exp(−t/T1))| | S(t) = |A (1 − 2 exp(−t/T1))| |
T1 PSIR | S(t) = A (1 − B exp(−t/T1)) | S(t) = A (1 − 2 exp(−t/T1)) |
T1 saturation recovery balanced SSFP | S(t) = A (1 − B exp(−t/T1)) | S(t) = A (1 − exp(−t/T1)) |
T1 MOLLI/T1 Look-Locker correction (magnitude images) | S(t) = |A (1 − B exp(−t/T1*))|; T1 = T1* (B − 1) | n/a |
T1 MOLLI/T1 Look-Locker correction (PSIR images) | S(t) = A (1 − B exp(−t/T1*)); T1 = T1* (B − 1) | n/a |
T2 spin echo (multi-echo and single-echo) | S(t) = A exp(−t/T2) + B; B > 0 | S(t) = A exp(−t/T2) |
T2-prepared balanced SSFP | S(t) = A exp(−t/T2) + B; B > 0 | S(t) = A exp(−t/T2) |
Phantom setup and imaging
TE (ms) | TR (ms)/delay between contrast preparations pulses | FA (°) | FOV (mm) | Matrix | Preparation pulse delays (ms) | iPAT/SENSE factor | Receiver BW (kHz) | ACQ time (hh:mm:ss) | |
---|---|---|---|---|---|---|---|---|---|
T1 spin-echo IR (magnitude images) | 5.8 | 10,000/10,000 | 90 | 241 × 241 | 128 × 128 | [21, 60, 100, 200, 300, 500, 660, 900, 1050, 1300, 1600, 2000, 2250, 2500, 3000, 3500, 4300] | off | 64 | 06:45:20 |
T1 PSIR | 1.11 | 2.4/40,000 | 35 | 360 × 270 | 192 × 144 | [150, 300, 400, 500, 700, 900, 1100, 1300, 1800, 2000, 2500, 3000, 3700, 4300, 5000, 6300] + 1 reference image without IR-preparation | 2 | 208.32 | 00:11:20 |
T1 saturation recovery balanced SSFP | 1.11 | 2.4/40,000 | 35 | 360 × 270 | 192 × 144 | [150, 300, 400, 500, 700, 900, 1100, 1300, 1800, 2000, 2500, 3000, 3700, 4300, 5000, 5600, 6300, 8000] + 1 reference image without SR preparation | 2 | 208.32 | 00:12:40 |
T1 MOLLI/T1 Look-Locker correction (magnitude and PSIR images) | 1.1 | 2.4/7920 | 35 | 360 × 270 | 192 × 144 | [130, 210, 1130, 1210, 2130, 2210, 3130, 4130] | 2 | 208.32 | 00:00:11 |
T2 spin echo (single-echo) | [6, 12, 20, 30, 40, 50, 70, 90, 120, 140, 180, 300, 400, 600, 1000] | 10,000/10,000 | 90 | 241 × 241 | 128 × 128 | n/a | off | 64 | 05:20:00 |
T2 spin echo (multi-echo) | [9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135, 144] | 1500/n/a | 90 | 160 × 160 | 256 × 256 | n/a | off | 62.5 | 00:06:24 |
T2-prepared balanced SSFP | 1.11 | 2.4/20,000 | 35 | 360 × 270 | 192 × 144 | T2p range = 25 − 200; ΔT2p = 5; | 2 | 208.32 | 00:12:20 |
T1 mapping
T2 mapping
Residual calculation for T1 and T2 mapping
Application on human MR images
Statistics
Results
Pixel-wise (complete image) | Pixel-wise (ROI only) | |
---|---|---|
T1 spin-echo IR (magnitude images) | 2.5 s (3 parameters, 17 images, 128 × 128 images, 13 435 refined pixels) | 0.03 s (3 parameters, 17 images, 200 pixels, 152 refined pixels) |
T1 PSIR | 11.7 s (3 parameters, 17 images, 192 × 144 matrix, 26 597 refined pixels) | 0.15 s (3 parameters, 17 images, 200 pixels, 200 refined pixels) |
T1 saturation recovery balanced SSFP | 11.2 s (3 parameters, 15 images, 192 × 144 matrix, 26 594 refined pixels) | 0.09 s (3 parameters, 15 images, 202 pixels, 202 refined pixels) |
T1 MOLLI/T1 Look-Locker correction (magnitude and PSIR images) | 6.4 s (3 parameters, 9 images, 192 × 144 matrix, 25 128 refined pixels) | 0.05 s (3 parameters, 9 images, 202 pixels, 198 refined pixels) |
T2 spin echo (single-echo and multi-echo) | 1.12 s (2 parameters, 15 images, 128 × 128 matrix, 9 175 refined pixels) | 0.04 s (2 parameters, 15 images, 207 pixels, 160 refined pixels) |
T2-prepared balanced SSFP | 11.7 s (3 parameters, 37 images, 192 × 144 matrix, 16 322 refined pixels) | 0.14 s (3 parameters, 37 images, 207 pixels, 184 refined pixels) |