Radiotherapy Couch Rotation Offset Compensation
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Solution Overview
Problem
Existing radiotherapy technologies fail to compensate for rotation offsets during patient positioning, leading to reduced registration accuracy and treatment effectiveness due to the use of three-dimensional treatment couches that cannot account for rotational changes.
Innovation Solution
An image-guided method and apparatus that acquire and determine a rotation offset between the planning and treatment stages, using reconstructed compensation images to register with real-time images and compute a tracking offset for precise target object tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a three-dimensional treatment couch is used for patient positioning, then the couch can move in three translational directions (X, Y, Z), but it cannot compensate for rotation offsets, resulting in reduced registration accuracy
Solution Approach 1:
The patent transitions from a three-dimensional treatment couch (X, Y, Z translations only) to a six-dimensional treatment couch that adds three rotational degrees of freedom (pitch, roll, yaw). This dimensional expansion enables the couch to compensate for both translational and rotational offsets between the planning and treatment stages, thereby resolving the contradiction by maintaining ease of operation while significantly improving registration accuracy.
2Reliability
If the patient is positioned using the radio therapy device instead of the diagnostic imaging device, then treatment positioning is achieved, but a six-dimensional offset (three translational and three rotational directions) occurs, requiring complex compensation
Solution Approach 1:
The patent employs a six-dimensional treatment couch that adds three rotational degrees of freedom to the traditional three translational directions. This enables comprehensive compensation for the six-dimensional offset (three translational + three rotational) that occurs when positioning patients on the radio therapy device, thereby maintaining reliable positioning accuracy without requiring overly complex external compensation systems.
Solution Approach 2:
The patent replaces complex mechanical positioning adjustments with an image-guided computational approach. By acquiring images during treatment, calculating the six-dimensional offset between planning and treatment positions, and automatically compensating through the programmable six-dimensional couch, the system substitutes manual mechanical adjustment with automated image-based positioning, reducing operational complexity while maintaining high accuracy.
3Productivity
If registration is performed between target area image and planned image during real-time image guidance, then treatment guidance is achieved, but rotation offset reduces registration accuracy and affects treatment effect
Solution Approach 1:
The patent implements a six-dimensional treatment couch that compensates for both translational and rotational offsets during real-time image guidance. By acquiring treatment images, calculating the six-dimensional offset (including three rotational components), and adjusting the couch position accordingly, the system maintains high registration accuracy between target area images and planned images, thereby preserving treatment efficiency without sacrificing precision.
Data Source
AI summary
An image-guided method and radio therapy device are provided. The method includes: acquiring a rotation offset, a planned image and a real-time image of a target object; and determining a tracking offset based on the rotation offset, the planned image and the real-time image, the tracking offset being used for tracking the target object; where the rotation offset is generated by a position difference of the target object in a planning stage and a treatment stage. The planned image of the target object is acquired in the planning stage. The tracking offset is determined based on the rotation offset, the planned image and the real-time image. The tracking of the target object based on the tracking offset compensates for image distortion caused by the deflection of the position of the target object in the planning stage and the treatment stage.