Optical surface tracking camera placement for radiotherapy
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Publication Number
US-12691302-B2
Publication Date
2026-07-28
Expiration Date
Abstract
A radiotherapy device and a method for imaging a subject using a radiotherapy device are provided. The radiotherapy device comprises a rotatable gantry, a support surface and a plurality of cameras. The rotatable gantry comprises a front, a rear and a bore. The support surface is moveable into the bore from a side of the radiotherapy device corresponding to the front of the rotatable gantry. The plurality of cameras are for monitoring a subject that is located on the support surface, the plurality of cameras including a rear camera disposed adjacent to the rear of the rotatable gantry.
Core Innovation
The invention describes a radiotherapy device with a rear time-of-flight camera outside the bore and adjacent to the rear of the rotatable gantry, together with one or more near-bore cameras. Their views overlap at least partially and include the subject in a treatment position. A controller averages rear-camera distance measurements across multiple pixels and uses the average with near-bore camera location data to verify subject positioning for radiotherapy.
The camera arrangement increases subject visibility during setup and treatment while preserving bore space. This configuration supports accurate positioning verification and radiation delivery. Combining or spatially averaging camera data further improves surface-position accuracy.
Claims Coverage
The claim coverage includes two inventive features across two independent claims directed to a radiotherapy device and an imaging method.
Radiotherapy device with overlapping rear and near-bore camera views
A radiotherapy device has a rear time-of-flight camera outside the bore and adjacent to the rear of the gantry, and one or more near-bore cameras. The cameras have at least partially overlapping views of the subject in a treatment position. A controller averages distance measurements across multiple pixels of the rear camera and uses that average with near-bore camera location data to verify positioning and control delivery of the therapeutic dose.
Imaging method for verifying subject positioning before radiotherapy
The method obtains images of the subject using the rear time-of-flight camera and one or more near-bore cameras with at least partially overlapping views. A controller averages rear-camera distance measurements across multiple pixels and uses that average with near-bore camera location data to verify subject positioning, then controls the radiotherapy treatment device to deliver the therapeutic dose as verified.
The independent claims cover a radiotherapy device and an imaging method using overlapping rear and near-bore camera views. Both use averaged rear-camera distance measurements and near-bore location data to verify subject positioning before radiotherapy delivery.
Stated Advantages
The camera arrangement increases subject visibility during setup and treatment while preserving bore space.
Combining or spatially averaging camera data improves surface-position accuracy and supports accurate positioning verification and radiation delivery.
Documented Applications
Surface-guided radiotherapy, including monitoring a subject in a treatment position and verifying positioning for delivery of radiation to target regions.
Imaging the subject during setup before the support surface enters the bore, using optional front-side setup cameras.
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