An Empirical Model for Describing the Small Field Penumbra in Radiation Therapy

<div>(a-b) The curves of slope versus <i>n</i> and <i>t</i> were shown in (a, b), respectively. Once the relationships of gantry angle versus slope and slope versus <i>n</i> and <i>t</i> are known, the parameters <i>n</i> and <i>t</i> in the LSRE model can be found easily to fit the measured dose profile or to construct the estimated profile for any gantry angle at coplanar irradiation with good agreement.</div>

BioMed Research International

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Figure 8

Figure 8: An Empirical Model for Describing the Small Field Penumbra in Radiation Therapy 