Figure 6

Lizard head segmentation comparison for hyperspectral and dual-energy imaging. Sagittal views of the segmented sample, producing maps of iodine-stained soft tissue (top row) and remaining hydroxyapatite (bottom row) bone structures. Results following K-edge subtraction for the TV-TGV reconstructed dataset (middle column) are directly compared to those following DECT acquisition of the same sample (left column), reduced to the same spatial resolution (137 μm). Labels indicate the successful segmentation of several iodine-stained soft tissue regions for the hyperspectral dataset, with similar structures identified in the DECT equivalent image. A comparison of HA maps show distinct bone structures observed across both datasets, as well as the accumulation of bone mineral in particular regions due to long term sample storage. Included is an example of a bone structure (quadrate) unidentified in TV-TGV segmentation. (Right column) Equivalent maps following FDK reconstruction of the hyperspectral dataset are also shown, with significant noise hiding a number of key features.