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US 10,500,420 B2Granted
Small beam area, mid-voltage radiotherapy system with reduced skin dose, reduced scatter around the treatment volume, and improved overall accuracy
OwnerJohn K. Grady, Lim Cheunginventors
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Abstract
A radiotherapy system comprising an X-ray tube operating at 100 to 800 kVp for providing X-ray beams of 50 mm diameter or less (and preferably approximately 30 mm or less) and configured to move the entrance beam footprint on the body during irradiation to any arbitrary sequential position set that has been predetermined to limit the intervening tissue dose rate at any one location to a safe level, such that the sum of the skin area traversed during treatment is 20 to 100 times the beam area.
Claims16
A system for image-guided radiotherapy, the system comprising:
- a gantry;
- at least one X-ray tube movably mounted to the gantry, wherein the at least one X-ray tube operates at 350 kVp to 800 kVp when providing radiotherapy;
- and
- at least one detector disposed opposite the at least one X-ray tube, the at least one detector being configured to permit selective imaging using the at least one X-ray tube;
- wherein the gantry is configured to move the at least one X-ray tube about a treatment volume such that X-rays emitted from the at least one X-ray tube are continuously directed at the treatment volume from any position relative to the treatment volume, and further wherein the gantry is configured such that when the treatment volume is disposed at the center of a spherical projection, the gantry is able to move the at least one X-ray tube so as to direct the X-rays emitted from the at least one X-ray tube at the treatment volume from any position on an inside surface of the spherical projection.
2 more elements
Dependencies are inferred from the claim text.