Figure 6From: Dosimetric comparison between coplanar and non coplanar field radiotherapy for ethmoid sinus cancerConformal index CI for each patient in the coplanar field CF (grey) and non coplanar field NCF (black) technique. CI is defined as follows: CI = (TV/VPTV) × (TV/V95%) TV: Treated Volume is the volume of PTV1 receiving the prescribed dose (95%); VPTV is the volume of PTV; V95% is the volume enclosed in the isodose 95%Back to article page