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After the centroid of the target volume (TV) was defined, equiangular lines from the centroid were generated at intervals of 1° in three-dimensional space. The points of intersection (POIs) of the TV and the equiangular lines were defined. The POIs of the volume of reference isodose (VRI) and the equiangular lines were also generated (a). The distances from the centroid to the TV (DT) and the VRI (DD) were acquired for the calculation of conformity indexdistance (CIdistance) (b).
