Table 1.
Percent error of T2 estimates (relative to the gold standard) for the of the physical phantom shown in Figure 3. The table shows % error of T2 values estimated from curves derived directly from the TE images (original curves) and curves recovered from the first 6 PCs. Results shown are for standard sampled radial data (i.e., data for each TE time point has 256 radial lines with 256 points per line).
| Exponential Fitting | ||||||
|---|---|---|---|---|---|---|
| Vial | Gold standard | FA=180 | FA=160 | FA=140 | FA=120 | |
| Original curves | A | 210.0 | 5.7% | 5.7% | 9.6% | 18.3% |
| B | 159.3 | 3.6% | 2.8% | 5.9% | 13.4% | |
| C | 80.7 | 3.2% | 2.1% | 5.0% | 12.0% | |
| Recovered curves | A | 210.0 | 5.6% | 5.7% | 9.8% | 18.4% |
| B | 159.3 | 3.6% | 2.7% | 6.0% | 13.6% | |
| C | 80.7 | 3.1% | 1.9% | 5.0% | 12.0% | |
| SEPG fitting with T1=+∞ | ||||||
|---|---|---|---|---|---|---|
| Vial | Gold standard | FA=180 | FA=160 | FA=140 | FA=120 | |
| Original curves | A | 210.0 | 0.7% | −0.9% | −2.0% | −3.7% |
| B | 159.3 | −1.2% | −3.0% | −4.0% | −5.5% | |
| C | 80.7 | −0.5% | −2.9% | −4.2% | −5.8% | |
| Recovered curves | A | 210.0 | 0.8% | −0.9% | −1.9% | −3.8% |
| B | 159.3 | −1.2% | −3.0% | −4.0% | −5.6% | |
| C | 80.7 | −0.6% | −2.9% | −4.2% | −5.8% | |
| SEPG fitting with T1 optimized (500 ms) | ||||||
|---|---|---|---|---|---|---|
| Vial | Gold standard | FA=180 | FA=160 | FA=140 | FA=120 | |
| Original curves | A | 210.0 | 2.4% | 1.2% | 1.8% | 3.2% |
| B | 159.3 | 0.0% | −1.6% | −1.6% | −0.8% | |
| C | 80.7 | −0.4% | −2.5% | −3.2% | −3.6% | |
| Recovered curves | A | 210.0 | 2.4% | 1.2% | 1.8% | 3.1% |
| B | 159.3 | 0.0% | −1.6% | −1.6% | −0.9% | |
| C | 80.7 | −0.4% | −2.5% | −3.2% | −3.6% | |