TABLE IV.
Tumor motion trajectories comparison in patient study, 4D reconstructed images with reference from single-slice cine MR. Measurements of tumor CNR comparing CT and MRI fast sequence FIESTA.
| Mean absolute error (mm) | Amplitude from cine (mm) | Relative error (%) | CNR | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Patient # | Age | Gender | Cancer site | SI | AP | ML | SI | AP | ML | SI | AP | ML | CT | FIESTA |
| 1 | 64 | M | Liver Mets | 4.7 | 2.4 | 5.5 | 16 | 15 | 9.9 | 30 | 16 | 56 | 3.5 | 7.8 |
| 2 | 76 | F | HCC | 0.25 | 0.12 | 2.0 | 3.6 | 1.7 | 1.8 | 6.8 | 7.2 | 108 | 0.12 | 4.1 |
| 3 | 68 | M | Liver Mets | 1.0 | 2.4 | 0.96 | 12 | 12 | 6.4 | 8.9 | 19 | 15 | 2.9 | 2.0 |
| 4 | 70 | F | HCC | 1.5 | 0.63 | 0.56 | 8.2 | 4.8 | 2.1 | 18 | 13 | 27 | 2.9 | 56 |
| 5 | 58 | M | HCC | 0.42 | 0.38 | 0.37 | 6.1 | 1.9 | 1.3 | 6.9 | 20 | 28 | 0.15 | 3.1 |
| 6 | 34 | F | HCC | 1.2 | 0.87 | 3.0 | 8.1 | 1.7 | 4.3 | 14 | 52 | 69 | 2.8 | 17 |
| Mean (±SD) | 65.0 (±9.7) | — — | — — | 1.5 (±1.6) | 1.1 (±1.0) | 2.1 (±2.0) | — — | — — | — — | 14 (±9.1) | 21 (±16) | 50 (±35) | 2.1 (±1.5) | 15 (±21) |
Note: F, female; M, male; SD, standard deviation; SI, superior–inferior; AP, anterior–posterior; ML, medial–lateral; CNR, contrast-to-noise ratio; CT, computed tomography; FIESTA, fast imaging employing steady-state acquisition; HCC, Hepatocellular carcinoma; Liver Mets, liver metastasis.