Table IV.

Mean healthy tissue overdosage factor values for the organs at risk for three-dimensional conformal radiotherapy and IMRT.

Technique	Spinal canal	Liver	Pancreas	Spleen	Left kidney	Right kidney
2-field	0.27	0.13	0.46	0.41	0.22	0.10
3-field	0.22	0.17	0.46	0.40	0.19	0.12
4-field	0.18	0.23	0.45	0.39	0.18	0.09
IMRT	0.17	0.17	0.45	0.36	0.12	0.07

IMRT, intensity-modulated radiation therapy.