Department of Radiation Oncology, Case Western Reserve University, Cleveland, USA;
Department of Radiation Oncology, East Carolina University, Greenville, USA;
Department of Radiation Oncology, Ohio State University, Columbus, USA;
Electron; Density; Phantom; Treatment; Planning; System; Anisotropic; Analytical; Algorithm; Pencil; Beam; Convolution; Inhomogeneity; Correction;