Radiotherapy Imaging System Calibration via Isocenter Reference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The calibration accuracy of radiotherapy equipment is compromised due to system errors in the imaging and positioning systems, which can lead to inaccurate targeting and treatment, especially when the positioning couch's accuracy is reduced or human error is introduced during the calibration process.
Innovation Solution
A method and device for calibrating radiotherapy equipment using an imaging body within a preset distance range of the isocenter, which involves imaging the body to determine image deviations and system errors, allowing for precise error correction and compensation, thereby improving the accuracy of the imaging and positioning systems without relying on the couch's positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the treatment couch is used to position the model body for calibration, then the calibration process can be performed, but the positioning accuracy is compromised due to couch system errors and human error
Solution Approach 1:
The patent introduces a calibration object with calibration marks as an intermediary element. Instead of directly positioning the model body on the treatment couch, the calibration object is placed at a known position relative to the imaging system, and its calibration marks serve as reference points for determining the imaging system's geometric relationship. This intermediary approach eliminates the need to rely on the treatment couch's positioning accuracy.
Solution Approach 2:
The patent replaces the mechanical positioning system (treatment couch) with an optical/imaging-based positioning method. By using the imaging system to capture images of the calibration object and comparing them with theoretical positions, the patent determines calibration parameters through image processing rather than mechanical movement, thereby eliminating mechanical positioning errors.
2Measurement precision
If the treatment couch is moved to position the model body, then calibration can be performed, but errors in the driving system affect positioning accuracy
Solution Approach 1:
The calibration object acts as an intermediary that decouples the calibration process from the treatment couch's positioning system. The calibration object is positioned at a known location, and its calibration marks provide reference points that are independent of the couch's driving system accuracy.
Solution Approach 2:
The patent substitutes mechanical positioning (treating couch movement) with an imaging-based approach. The imaging system captures the calibration object's position, and computational methods determine the geometric relationship, replacing mechanical precision requirements with optical measurement and calculation.
3Measurement precision
If human operators perform the calibration process, then calibration can be conducted, but human error introduces inaccuracies
Solution Approach 1:
The calibration process becomes self-service through automated image processing. The system automatically captures images of the calibration object, extracts calibration mark positions, compares them with theoretical positions, and computes calibration parameters without requiring manual measurement or operator intervention, thereby eliminating human error.
Solution Approach 2:
The patent replaces manual calibration operations with automated image processing and computational algorithms. Instead of requiring operators to manually measure and calculate calibration parameters, the system uses image recognition and computational geometry to automatically determine calibration accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the calibration accuracy of the imaging and positioning systems, reducing the impact of system errors and human errors, leading to more precise targeting and treatment delivery in radiotherapy.
Implementation Method 1
imaging the imaging body through the imaging system to obtain an actual image of the imaging body
Data Source
AI summary
Provided are a calibration method, device and storage medium of radiotherapy equipment. The calibration method of the radiotherapy equipment adopts an imaging body disposed within a preset distance range of an isocenter of radiotherapy equipment to perform error calibration on the radiotherapy equipment, and includes: imaging the imaging body through an imaging system to obtain an actual image of the imaging body; determining an image deviation between the actual image and a theoretical image of the imaging body, wherein the theoretical image is determined in advance based on a theoretical position of the imaging system and a spatial position of the imaging body in a rack; and determining a system error of imaging system based on the image deviation. Thus, the imaging system is calibrated without moving a treatment couch. The calibration accuracy of imaging system is not influenced by movement precision of treatment couch. The calibration accuracy is improved.