Planning of fractionated methods of lung irradiation using the TDF factor

: Analyzing the data available in the literature shows that lung tissue is most radiosensitive and the impact of the volume of exposure of lung tissue to radiation per tolerance dose is greater than that of connective tissue. A modified Ellis model including the volume of irradiated tissue as a variable in addition to the number of fractions and the duration of radiation therapy. It has been used to calculate tables of TDF values for planning the fractionated regimens of lung radiation.