Patient marking and positioning in a radiation therapy system

A method for a radiation therapy system that includes a movable couch to perform radiation therapy, the method comprising:

• based on X-ray images of an anatomical region of a patient disposed on the movable couch, wherein the anatomical region includes a target volume, reconstructing a digital volume of the anatomical region;
• based on a location of a patient origin in the digital volume, determining one or more shift values for repositioning the patient origin at an isocenter of the radiation therapy system;
• based on the one or more shift values, determining whether the movable couch can reposition the patient origin at the isocenter;
• in response to a determination that the movable couch can reposition the patient origin at the isocenter, generating one or more prompts in a user interface of the radiation therapy system associated with repositioning the movable couch so that the patient origin is disposed at the isocenter;
• and
• in response to a determination that the movable couch cannot reposition the patient origin at the isocenter, generating an alert.

A radiation therapy system, comprising:

• a movable couch;
• and
• a processor configured to:
• based on X-ray images of an anatomical region of a patient disposed on the movable couch, wherein the anatomical region includes a target volume, reconstruct a digital volume of the anatomical region;
• based on a location of a patient origin in the digital volume, determine one or more shift values for repositioning the patient origin at an isocenter of the radiation therapy system;
• based on the one or more shift values, determine whether the movable couch can reposition the patient origin at the isocenter;
• in response to a determination that the movable couch can reposition the patient origin at the isocenter, generate one or more prompts in a user interface of the radiation therapy system associated with repositioning the movable couch so that the patient origin is disposed at the isocenter;
• and
• in response to a determination that the movable couch cannot reposition the patient origin at the isocenter, generate an alert.