Lumbar scans were performed on a 3T GE MR750 scanner and sequences included standard clinical T1- and T2-weighted MRI sequences and advanced sequences used for cartilage endplate detection (high-resolution 3D ultrashort echo time, UTE25 (link) and fat fraction measurement (Iterative Decomposition of water and fat with Echo Asymmetry and Least-Squares Estimation, IDEAL26 (link) (Figure 1 ). Specifications for the UTE sequence included TE=0.075 ms, TR=10 ms, voxel size of 0.22×0.22×0.80 mm3, and fat suppression. Specifications for the IDEAL sequence included TR=7ms, TE=2.1ms, flip angle=3°, rBW=±83.3kHz, FoV=22cm, in-plane resolution=1.3mm, and slice thickness=4mm).
Protocol detail
Lumbar MRI Cartilage and Fat Imaging
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Corresponding Organization : University of California, San Francisco
Other organizations : New York University, University of Utah
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Variable analysis
independent variables
- MR scanner type (3T GE MR750)
- MRI sequences (T1-weighted, T2-weighted, UTE, IDEAL)
- Cartilage endplate detection
- Fat fraction measurement
- Voxel size for UTE sequence (0.22×0.22×0.80 mm^3)
- Parameters for IDEAL sequence (TR=7ms, TE=2.1ms, flip angle=3°, rBW=±83.3kHz, FoV=22cm, in-plane resolution=1.3mm, slice thickness=4mm)
- Fat suppression for UTE sequence
- No positive or negative controls were explicitly mentioned.
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