A method (100, 200) for updating an initial volumetric dose, the method (100, 200) comprising: automatically generating, in a processor of a computing device, an initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) in a target area based on input data, the input data comprising an initial dose distribution; causing (103, 205) the display of a graphical image comprising the target area and the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501), the graphical image being displayed in a display device communicatively coupled to the computing device; receiving user input via a user input apparatus, the user input comprising a first user action at a first position in the graphical image and a second user action at a second position in the graphical image; calculating a deformation of the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) based on the user input, the deformation beginning at a position of the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) corresponding to the first position and ending at a position of the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) corresponding to the second position; and updating the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) based on the deformation and the display to include a visualization of the deformation; characterized in that: the target area comprises an inner region and an outer region and wherein said deformation is configured to deform the outer region to a greater degree when compared to the deformation applied to the inner region; or a weighted multiplier is applied to dose values for positions having a greater proximity to a starting position, with the multiplier decreasing the farther the deformation is extended from the starting position; or the weighted multiplier is used to supplement deformation values the greater the distance the deformation is extended, resulting in a greater degree of deformation towards a terminal point in the deformation than the deformation experienced at the position the deformation operation started, or the inverse. automatically generating, in a processor of a computing device, an initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) in a target area based on input data, the input data comprising an initial dose distribution; causing (103, 205) the display of a graphical image comprising the target area and the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501), the graphical image being displayed in a display device communicatively coupled to the computing device; receiving user input via a user input apparatus, the user input comprising a first user action at a first position in the graphical image and a second user action at a second position in the graphical image; calculating a deformation of the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) based on the user input, the deformation beginning at a position of the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) corresponding to the first position and ending at a position of the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) corresponding to the second position; and updating the initial volumetric dose objective (305, 307, 309, 401a, 401b, 501) based on the deformation and the display to include a visualization of the deformation; characterized in that: the target area comprises an inner region and an outer region and wherein said deformation is configured to deform the outer region to a greater degree when compared to the deformation applied to the inner region; or a weighted multiplier is applied to dose values for positions having a greater proximity to a starting position, with the multiplier decreasing the farther the deformation is extended from the starting position; or the weighted multiplier is used to supplement deformation values the greater the distance the deformation is extended, resulting in a greater degree of deformation towards a terminal point in the deformation than the deformation experienced at the position the deformation operation started, or the inverse. the target area comprises an inner region and an outer region and wherein said deformation is configured to deform the outer region to a greater degree when compared to the deformation applied to the inner region; or a weighted multiplier is applied to dose values for positions having a greater proximity to a starting position, with the multiplier decreasing the farther the deformation is extended from the starting position; or the weighted multiplier is used to supplement deformation values the greater the distance the deformation is extended, resulting in a greater degree of deformation towards a terminal point in the deformation than the deformation experienced at the position the deformation operation started, or the inverse.