Radiotherapy Calibration Phantom for Optical Surface Tracking Accuracy
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Solution Overview
Problem
Existing optical surface tracking systems in radiotherapy suffer from inaccuracies due to variability in the relative locations and orientations of imaging devices, leading to uncertainties in patient positioning and treatment delivery, necessitating improved calibration and accuracy in surface-guided radiotherapy.
Innovation Solution
A phantom is designed with distinct three-dimensional structures detectable by both kV imaging and optical surface tracking systems, allowing for spatial measurements and image comparisons to calibrate the optical system accurately, integrating data sources for precise patient positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical surface tracking systems are used for surface-guided radiotherapy, then patient positioning accuracy can be improved, but installation variability of imaging devices introduces coordinate system misalignment and reduces measurement accuracy
Solution Approach 1:
A calibration phantom with known three-dimensional structures serves as an intermediary between the optical surface tracking system and the radiotherapy device. The phantom contains structures detectable by both systems, enabling establishment of a reliable coordinate transformation relationship that compensates for installation variability and ensures accurate patient positioning.
2Adaptability or versatility
If imaging devices are installed at different locations in the treatment room, then system versatility is improved, but variability in relative locations and orientations increases device complexity and calibration difficulty
Solution Approach 1:
The calibration phantom is designed with universal three-dimensional structures that can be detected by multiple different imaging devices regardless of their installation locations or orientations. This multi-functional design allows the same phantom to serve as a common reference for calibrating various imaging devices, simplifying the integration of coordinate systems across diverse device configurations.
Data Source
AI summary
A phantom configured for evaluating radiotherapy, a radiotherapy device, a method for evaluating imaging for radiotherapy, and a computer-readable medium are provided. The phantom comprises a first three-dimensional structure configured for detection by a kV imaging system. The phantom further comprises a second three-dimensional structure configured for detection by an optical surface tracking system and spaced apart from the first three-dimensional structure.