Figure 1. Schematic depth dose diagram of a proton beam Bragg peak, the spread out Bragg peak and a megavoltage X-ray beam (modified from Suit et al [12]). The grey shaded areas indicate the extent of dose reduction within normal tissues situated proximal and distal to the tumour target.
Figure 4. (A–C) Simplified schematic diagrams of protons and (D–F) X-ray percentage depth dose distributions for three simple field arrangements. In B, C, E, F depth is measured along the direction of opposing fields. Relatively small changes in dose are not included in these fields.
Figure 6. (a, b) Comparative dose distributions for IMRT and protons for a recurrent sarcoma in a young 12-year-old boy (reproduced by kind permission of Dr A Lomax, PSI, Switzerland and Prof. P Hoskins, Editor of Clinical Oncology).
Figure 7. Comparisons of dose distributions for a 4 field X-ray (photon) plan and a proton plan for treatment of hepatocellular cancer (courtesy of Dr J Munzenrider, Northwest Proton Therapy Centre, Boston, USA).
Figure 8. An example of a single field application of protons to treat a posterior orbital cancer (courtesy of Dr J Munzenrider, Northwest Proton Therapy Centre, Boston, USA). The colours denote different dose levels with red being the full prescribed dose, with fall off to the limits of the beam.
