Human-sized head phantom Monte Carlo simulations.

Calculated PVDRs, peak and valley doses at 7.5 cm depth and at the entrance site in a water phantom when delivering an arbitrary dose of 100 Gy to a 2×2 mm2, 1×1 cm2 or 3×3 cm2 target in the interlaced region (7.5 cm depth) with 50-µm wide MBs and for two different MB spacings. The interlacement enhancement factor corresponds to the increase in radiation dose in the target with respect to the in-MB dose given in a single array of MBs as represented on figure 7.