Fig. 4.

$\mu$-Computed tomography ($\mu \text{-}\mathrm{CT}$) validation of a defective phantom: (a) cross-sectional image of two-layer phantom, arrows point to the unshaped channels; (b) cross-sectional image from the same phantom with a surface leakage, where the arrow points to the leaking area; and (c) 3-D view with bottom layer omitted for clarity.