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. Author manuscript; available in PMC: 2019 Jun 25.

Published in final edited form as: Phys Med Biol. 2018 Jun 25;63(13):135001. doi: 10.1088/1361-6560/aacab6

Table 5.

Maximum enhancement factor (EF) with corresponding mean incident photon energy for multiple beams treating a 4 cm brain tumour.

Head Diameter (cm)	Tumour Location	GNP distribution
Head Diameter (cm)	Tumour Location	cyto	homo	media
10	centre	1.12 (140 keV)	5.90 (28.5 keV)	0.99 (108 keV)
15	centre	1.11 (140 keV)	4.73 (45.6 keV)	0.99 (108 keV)
17.5	centre	1.11 (140 keV)	4.33 (45.6 keV)	0.98 (108 keV)
17.5	6 cm from centre	1.12 (45.6 keV)	7.09 (28.5 keV)	0.96 (85.8 keV)
20	centre	1.09 (140 keV)	4.03 (57.9 keV)	0.97 (140 keV)
20	6 cm from centre	1.09 (140 keV)	5.62 (28.5 keV)	0.98 (57.9 keV)