Figure 3
CT dosimetry phantoms representing (left to right): adult head (diameter 160 mm), paediatric head (100 mm), small animal (50 mm) and mouse (35 mm). Holes in the centre and positioned around the periphery at 3, 6, 9 and 12 o'clock (towards the source) receive the CT ion chamber (not shown) or removable 12 mm-diameter by 14 cm-long PMMA inserts. |