Patent ID: 11896851
Assignee: VARIAN MEDICAL SYSTEMS, INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 14:
15. A radiation treatment system comprising:
a gantry that is rotatably coupled to a drive stand and is configured to rotate about a bore of the radiation treatment system;
a treatment-delivering X-ray source mounted on the gantry and configured to direct treatment X-rays to a target volume of a patient disposed in the bore;
an imaging X-ray source mounted on the gantry;
an X-ray imager mounted on the gantry; and
a processor configured to:
cause the gantry to rotate continuously in a first direction through a first treatment arc that includes a first treatment delivery position and a second treatment delivery position;
while causing the gantry to rotate through the first treatment arc in the first direction from the first treatment delivery position to the second treatment delivery position, cause the imaging X-ray source to direct X-rays through the target volume and toward the X-ray imager;
receive a set of X-ray projection images from the X-ray imager in response to the X-rays being directed toward the X-ray imager;
based on the set of X-ray projection images, monitor the patient for a loss of breath hold; and
in response to a determination that the patient has lost breath hold:
store a gantry angle at which the patient has lost breath hold; and
end the first treatment arc.