Depth Camera on Radiotherapy Couch for Positioning
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Solution Overview
Problem
Current surface-guided radiotherapy systems require additional cameras for treatment monitoring after positioning, complicating system design and increasing costs due to fixed camera positions relative to radiotherapy equipment.
Innovation Solution
A radiotherapy system with a depth camera fixed at the end of a movable treatment couch, allowing seamless integration for both positioning and monitoring by transforming coordinates between camera and isocentric coordinate systems to align the treatment couch with the radiation chamber's isocenter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a depth camera is fixed at a fixed position relative to the radiotherapy equipment, then the camera can be used for both positioning and treatment monitoring, but the camera cannot move with the treatment couch to maintain optimal viewing angles throughout the treatment process
Solution Approach 1:
The patent combines the positioning camera and treatment monitoring camera into a single depth camera unit that is integrated with the treatment couch. This unified camera system performs both positioning and monitoring functions, eliminating the need for separate camera systems while maintaining measurement precision through coordinate transformation algorithms.
Solution Approach 2:
The camera is mounted on the movable treatment couch rather than being fixed to the radiotherapy equipment, allowing the camera to dynamically adjust its position along with the couch. This dynamic mounting enables the camera to maintain optimal viewing angles throughout the treatment process while moving, preserving measurement accuracy without increasing system complexity.
2Adaptability or versatility
If additional cameras are added for treatment monitoring, then monitoring capability is improved, but system complexity and cost increase
Solution Approach 1:
The depth camera is designed to perform multiple functions: it serves as both a positioning camera during setup and a treatment monitoring camera during therapy delivery. This multi-functional design eliminates the need for additional dedicated monitoring cameras, reducing system complexity and cost while maintaining full monitoring capability through coordinate system transformations.
Solution Approach 2:
The patent replaces the need for additional physical cameras with a computational solution involving coordinate transformation algorithms. By mathematically transforming coordinates between the moving camera frame and the fixed treatment isocenter frame, the system achieves monitoring capability equivalent to multiple cameras without the physical complexity of installing and calibrating multiple devices.
Data Source
AI summary
A control method for positioning is provided, which is applicable to a radiotherapy system. The method includes: acquiring a plurality of first body surface coordinates of a target site in a three-dimensional body surface image of a treatment object on a treatment couch; acquiring a plurality of second body surface coordinates under an isocentric coordinate system by transforming the first body surface coordinates using a target transformation matrix corresponding to the first placement position; determining, based on the plurality of second body surface coordinates and a contour image of the target site in the treatment plan, a placement offset of the target site, so as to control the treatment couch to move until the placement offset of the target site upon the movement meets a target offset requirement.