Figure 6.

The tractography results at different anisotropy (NQA or FA) thresholds in articular cartilage from the single-shell acquisition (protocol 2). The cartilage region is enlarged in the DWI image (a). Tractography by GQI (red arrows, e-g) always shows more intact tracts than DTI (red arrows, b-d) at the same anisotropy threshold. Most tracts from RZ are terminated in TZ (yellow arrows, d and g) with higher FA using DTI. The quantitative tract length (h) gradually decreases with higher anisotropy threshold for both DTI and GQI, while GQI shows higher tract length than DTI at the same anisotropy threshold.