Volumetric modulated arc radiotherapy for limited osteosclerotic myeloma

Table 1 Comparison between the treatment plans of critical organs dose exposure

		3D-RT	VMAT
PTV (Gy)	Min	30.5	38.7
	Max	49.1	50.8
	mean ± SD	46.7 ± 2.9	47.5 ± 1.6
Kidney R (Gy)	D10	16.2	18.7
	D20	14.4	14.2
	D30	13.1	11.1
	Dmax	39.6	38
	Dmean	7.9	7.5
	V10	46.7%	33.9%
	V20	2.0%	8.2%
	V30	0.1%	0.7%
Kidney L (Gy)	D10	18.3	19.2
	D20	15.5	14.7
	D30	14.1	11.7
	Dmax	46.7	44.9
	Dmean	9.0	7.6
	V10	44.7%	34.5%
	V20	7.5%	8.7%
	V30	3.5%	0.7%
Small bowel (Gy)	D10	25.8	18.1
	D20	21.6	15.3
	D30	12.4	13.2
	Dmax	46.8	43.1
	Dmean	9.6	8.8
	V10	40.6%	43.6%
	V20	20.8%	6.0%
	V30	2.6%	0.2%
Spinal cord (Gy)	D10	47.3	37.5
	D20	47.1	36.0
	D30	46.8	34.8
	Dmax	47.7	41.0
	Dmean	31.8	22.5
	V10	70.5%	64.3%
	V20	67.9%	59.7%
	V30	66.2%	53.8%
Femoral head R (Gy)	D10	27.2	5.5
	D20	25.8	4.4
	D30	21.5	3.2
	Dmax	30.2	7.8
	Dmean	11.6	2.3
	V10	38.8%	0.0%
	V20	31.2%	0.0%
	V30	0.02%	0.0%
Femoral head L (Gy)	D10	47.4	44.4
	D20	46.8	40.4
	D30	45.9	36.7
	Dmax	47.9	49.3
	Dmean	29.1	21.2
	V10	75.0%	58.4%
	V20	64.0%	48.2%
	V30	52.5%	38.2%
Bladder (Gy)	D10	25.6	19.8
	D20	24.4	16.7
	D30	24.1	14.2
	Dmax	45.0	36.2
	Dmean	24.3	12.5
	V10	100.0%	59.0%
	V20	99.0%	9.5%
	V30	5.3%	0.4%

3D-RT: Conformational radiation therapy; VMAT: Volumetric intensity-modulated arc therapy; PTV: Planned target volume; Gy: Gray; D10, D20, D30: Doses delivered to 10%, 20% and 30% of critical organs volumes, respectively; V10, V20, V30: Volumes of critical organs that received 10 Gy, 20 Gy and 30 Gy, respectively; R: Right; L: Left.