Planning system for adaptive radiation therapy

A treatment planning device comprising:

• at least one electronic processor;
• and
• a non-transitory computer-readable medium storing instructions readable and executable by the at least one electronic processor to perform a treatment planning method comprising:
• obtaining a treatment plan generated on the basis of a planning image of a region of a patient body and on the basis of dose objectives with respect to the region of the patient body, the treatment plan corresponding to a dose distribution in the region of the patient body;
• receiving a further image of the region of the patient body;
• updating a rigid spatial transform by performing at least one iteration of an update process that does not including computing a partial derivative of the dose objectives with respect to the dose distribution;
• and
• adapting the treatment plan to generate an adapted treatment plan which includes an adjustment by the updated rigid spatial transform of patient position respective to a radiation treatment device.

A treatment planning method comprising:

• obtaining a treatment plan generated on the basis of a planning image of a region of a patient body and on the basis of dose objectives with respect to the region of the patient body, the treatment plan corresponding to a dose distribution in the region of the patient body,
• receiving a further image of the region of the patient body,
• determining a rigid spatial transform for generating at least one of an adapted treatment plan from the treatment plan and an adapted dose distribution from the dose distribution on the basis of the further image and on the basis of the dose objectives using an iterative process that alternates between updating the dose distribution and updating the rigid spatial transform;
• and
• adapting the treatment plan to generate an adapted treatment plan which includes an adjustment by the determined rigid spatial transform of patient position respective to a radiation treatment device;
• wherein the treatment planning method is performed by at least one electronic processor.