Method for quantifying patient set up errors in radiotherapy

A non-transitory computer readable medium comprising instruction that when executed by a processor of a treatment planning system cause the system to:

• receive a planning image of a subject and a treatment image of the subject;
• determine a clinical volume from the planning image;
• define a planning envelope volume around the clinical volume;
• determine a location of the clinical volume and the planning envelopes volume on the treatment image;
• and
• determine an encapsulation metric for the treatment image,
• wherein the encapsulation metric defines the extent of encapsulation of the clinical volume on the treatment image within the planning envelope volume.

A computer-implemented method for analyzing medical images, comprising:

• receiving, by a processor of an image planning system, a planning image of a subject and a treatment image of the subject;
• determining, by the processor, a clinical volume from the planning image;
• defining, by the processor, a planning envelope volume around the clinical volume;
• determining, by the processor, a location of the clinical volume and the planning envelopes volume on the treatment image;
• and
• determining, by the processor, an encapsulation metric for the treatment image,
• wherein the encapsulation metric defines the extent of encapsulation of the clinical volume on the treatment image within the planning envelope volume.