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This 65% dose voxel surface (blown up) actually ranges from 65% to 95%, with large discontinuities. However, to what spatial error do these dose errors correspond? The maximum spatial error at any point should not be greater than the size of a voxel. In XY this is usually small, but can be substantial in Z (if planes are far apart). This is where one often sees such discrepancies, usually at the end caps of structures.