RADIATION TREATMENT PLANNING THAT CONSIDERS THE DIMENSIONS OF VOLUMES IN A TREATMENT TARGET

For planning radiation treatment using spot scanning, also known as pencil beam scanning, the size and/or shape of the treatment target is considered when determining the placement and density of spots in the treatment target. For example, when generating a radiation treatment plan, the size and/or shape of the treatment target can be considered when determining the placement and density of spots in the treatment target. During treatment planning, the treatment target can be separated into regions corresponding to different target volumes in the treatment target, and the placement and density of spots (the amount of spacing between spots) in each region can be determined independently for each region according to the size and/or shape of the region.