Fig. 2
Customized phantoms: (a) Three spheres with a radius equal to 0.03 mm and spaced by 0.1 mm from centre to centre were used to validate the systems’ resolution. (b) Top view of the customized resolution phantom with small cylindrical capillaries, the red volumes represent three cylindrical capillaries with 0.03 mm in radius and spaced by 0.1 mm from centre to centre are placed inside a cylinder which represents the background, with 0.5 mm height and 0.5 mm diameter. (c) Customized cylinder-sphere phantom used to study the system performance in lesion detection, a sphere with a 0.03 mm radius (representing a defect) placed inside a cylinder, which represents the background, with 0.2 mm height and 0.2 mm diameter.
