Radiation Oncology

Table 1 Conversion of Hounsfield Unit (HU) to the chemical composition and weights (%)

From: Development of clinical application program for radiotherapy induced cancer risk calculation using Monte Carlo engine in volumetric-modulated arc therapy

HU	H	C	N	O	Na	Mg	P	S	Cl	Ar	K	Ca	Ti	Cu	Zn	Ag	Sn
− 1050	0	0	75.5	23.2	0	0	0	0	0	1.3	0	0	0	0	0	0	0
− 950	10.3	10.5	3.1	74.9	0.2	0	0.2	0.3	0.3	0	0.2	0	0	0	0	0	0
− 120	11.6	68.1	0.2	19.8	0.1	0	0	0.1	0.1	0	0	0	0	0	0	0	0
− 82	11.3	56.7	0.9	30.8	0.1	0	0	0.1	0.1	0	0	0	0	0	0	0	0
− 52	11	45.8	1.5	41.1	0.1	0	0.1	0.2	0.2	0	0	0	0	0	0	0	0
− 22	10.8	35.6	2.2	50.9	0	0	0.1	0.2	0.2	0	0	0	0	0	0	0	0
8	10.6	28.4	2.6	57.8	0	0	0.1	0.2	0.2	0	0.1	0	0	0	0	0	0
19	10.3	13.4	3	72.3	0.2	0	0.2	0.2	0.2	0	0.2	0	0	0	0	0	0
80	9.4	20.7	6.2	62.2	0.6	0	0	0.6	0.3	0	0	0	0	0	0	0	0
120	9.5	45.5	2.5	35.5	0.1	0	2.1	0.1	0.1	0	0.1	4.5	0	0	0	0	0
200	8.9	42.3	2.7	36.3	0.1	0	3	0.1	0.1	0	0.1	6.4	0	0	0	0	0
300	8.2	39.1	2.9	37.2	0.1	0	3.9	0.1	0.1	0	0.1	8.3	0	0	0	0	0
400	7.6	36.1	3	38	0.1	0.1	4.7	0.2	0.1	0	0	10.1	0	0	0	0	0
500	7.1	33.5	3.2	38.7	0.1	0.1	5.4	0.2	0	0	0	11.7	0	0	0	0	0
600	6.6	31	3.3	39.4	0.1	0.1	6.1	0.2	0	0	0	13.2	0	0	0	0	0
700	6.1	28.7	3.5	40	0.1	0.1	6.7	0.2	0	0	0	14.6	0	0	0	0	0
800	5.6	26.5	3.6	40.5	0.1	0.2	7.3	0.3	0	0	0	15.9	0	0	0	0	0
900	5.2	24.6	3.7	41.1	0.1	0.2	7.8	0.3	0	0	0	17	0	0	0	0	0
1000	4.9	22.7	3.8	41.6	0.1	0.2	8.3	0.3	0	0	0	18.1	0	0	0	0	0
1100	4.5	21	3.9	42	0.1	0.2	8.8	0.3	0	0	0	19.2	0	0	0	0	0
1200	4.2	19.4	4	42.5	0.1	0.2	9.2	0.3	0	0	0	20.1	0	0	0	0	0
1300	3.9	17.9	4.1	42.9	0.1	0.2	9.6	0.3	0	0	0	21	0	0	0	0	0
1400	3.6	16.5	4.2	43.2	0.1	0.2	10	0.3	0	0	0	21.9	0	0	0	0	0
1500	3.4	15.5	4.2	43.5	0.1	0.2	10.3	0.3	0	0	0	22.5	0	0	0	0	0
1640	0	0	0	0	0	0	0	0	0	0	0	0	0	4	2	65	29
2300	0	0	0	0	0	0	0	0	0	0	0	0	100	0	0	0	0
3095	0	0	0	0	0	0	0	0	0	0	0	0	100	0	0	0	0

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