Memory and apparatus pertaining to the automated calculation of supplemental patient volume information

An apparatus comprising:

• a radiation-treatment platform;
• a memory having a radiation-treatment plan stored therein to be carried out by the radiation-treatment platform, the radiation-treatment plan based upon a particular patient volume;
• a control circuit operably coupled to the memory and to the radiation-treatment platform and being configured to:
• receive subsequent information from the radiation-treatment platform regarding the particular patient volume;
• automatically use the subsequent information regarding the particular patient volume to calculate supplemental patient volume information to be used by the radiation-treatment plan by, at least in part, automatically applying at least one rule regarding a location of a margin relative to the particular patient volume wherein the margin is calculated as an inner periphery located a specific distance inwardly of an outer boundary of the particular patient volume;
• automatically use the supplemental patient volume information with the radiation-treatment plan to adapt to changes with respect to a patient's geometry.