. Author manuscript; available in PMC: 2015 Jul 30.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2013 Jun 19;87(1):216–222. doi: 10.1016/j.ijrobp.2013.05.013

Table 1.

Variations of mean LET and mean RBE values among BPs for head-and-neck (H&N) and pancreatic cancer (PC) patients, as calculated by Equation 2.

patient	Spot Size	Target (α/β = 12 Gy)		Brainstem (α/β = 2.1 Gy)		Chiasm (α/β = 2.9 Gy)

		LET_mean variation	RBE_mean variation	LET_mean variation	RBE_mean variation	LET_mean variation	RBE_mean variation
H&N1	Large	15.0%	1.3%	34.5%	18.3%	27.2%	4.9%
H&N1	Small	11.5%	1.2%	10.5%	8.3%	22.8%	4.9%
H&N2	Large	28.5%	2.5%	45.5%	13.9%	61.9%	9.7%
H&N2	Small	9.5%	1.1%	221.6%	74.9%	19.5%	4.7%
H&N3	Large	18.6%	1.7%	80.9%	37.8%	45.8%	8.2%
H&N3	Small	8.9%	1.0%	32.8%	20.7%	27.0%	6.5%
H&N4	Large	8.3%	0.8%	50.0%	16.4%	56.3%	13.1%
H&N4	Small	9.8%	1.0%	103.0%	37.3%	117.2%	31.2%
H&N5	Large	16.4%	1.4%	43.9%	16.3%	35.0%	6.0%
H&N5	Small	10.3%	1.0%	37.3%	19.6%	28.9%	5.3%

		PTV (α/β = 9.8 Gy)		Liver (α/β = 1.5 Gy)		Lt Kidney (α/β = 3.0 Gy)		Rt Kidney (α/β = 3.0 Gy)		Stomach (α/β = 8.5 Gy)

		LETmean variation	RBE_mean variation	LET_mean variation	RBE_mean variation	LET_mean variation	RBE_mean variation	LET_mean variation	RBE_mean variation	LET_mean variation	RBE_mean variation
PC1	Large	7.9%	0.5%	61.3%	32.4%	25.0%	2.9%	36.3%	5.8%	26.2%	2.6%
PC1	Small	1.2%	0.3%	11.7%	7.5%	14.4%	3.6%	23.4%	7.7%	7.3%	1.0%
PC2	Large	14.3%	0.8%	38.1%	16.2%	35.3%	4.2%	60.5%	9.3%	58.0%	7.1%
PC2	Small	5.1%	0.5%	13.9%	8.3%	22.2%	6.1%	54.1%	17.4%	19.0%	4.2%