Method and apparatus pertaining to irradiating a treatment volume while maintaining the treatment volume a predetermined offset distance from the radiation-treatment isocenter
A control circuit 109 is configured to control selective movement of at least the patient-support platform 108 (during a radiation treatment session and typically while the radiation source 102 is also moving) such that during at least a part of the radiation treatment session a patients radiation-treatment target volume is maintained at a predetermined offset distance away from the radiation-treatment isocenter. By one approach the control circuit maintains that predetermined offset distance for the duration of the radiation treatment session. By one approach, the control circuit is further configured to control selective movement of at least the patient-support platform such that during the radiation treatment session the patients radiation-treatment target volume moves along a predetermined trajectory (even while maintaining the aforementioned predetermined offset distance).
