TABLE 1.
Characteristics of 2D FSE Sequences and Recent Methods for More Efficient Morphologic Knee MRI
| Properties | 2D FSE | 3D FSE | 3D T2-Sh | 3D qDESS |
|---|---|---|---|---|
| In-plane resolution | High | Moderate | Moderate | High |
| Through-plane resolution | Low | High | High | Moderate |
| Slice gaps | Present | Absent | Absent | Absent |
| Blurring | Low | Moderate | Moderate | Low |
| Contrasts | Conventional | Conventional | Multiple; Conventional | Dual; Novel |
| Quantitative | No | No | No | Yes (T2) |
| Reconstruction time | Fast | Fast | Moderate | Fast |
| Normalized sampling speed* | 1.20μL*min (39), 2.25μL*min (32), 2.92μL*min (48) | 1.03μL*min (32) | 1.30μL*min (39) | 0.90μL*min (48) |
| Product sequence | Yes | Yes | No | No |
| Demonstrated acceleration | ||||
| Parallel imaging | Yes | Yes | Yes | Yes |
| Compressed sensing | Yes | Yes | Yes | No |
| Deep learning | Yes | Yes | No | Yes |
Normalized sampling speed was calculated as a product of the voxel volume and the scan time for T2-weighted sequences, where smaller values indicate higher efficiencies.