Radiotherapy Isocenter Verification Using Digital Projection Data
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Solution Overview
Problem
Traditional film-based methods for verifying the consistency between radiotherapy equipment isocenter and treatment isocenter are cumbersome and inefficient, requiring frequent film replacement and manual analysis, which reduces the precision and speed of radiotherapy equipment checks.
Innovation Solution
A method and system using a radiation blocking body and a processing device to acquire and analyze projection data, determining the offset between the radiotherapy equipment isocenter and treatment isocenter by generating image data with a light spot and shading, and calculating the offset using various algorithms to improve accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If film-based method is used for isocenter verification, then manual analysis can be performed, but the process becomes cumbersome and inefficient requiring frequent film replacement
Solution Approach 1:
The patent replaces the mechanical film-based verification system with an electronic detector system that directly captures projection data. The detector converts radiation signals into digital images automatically, eliminating the need for manual film handling, replacement, and analysis, thereby streamlining the isocenter verification process while maintaining measurement accuracy.
2Measurement precision
If film-based method is used for isocenter verification, then manual analysis can be performed, but the precision and speed of checks are reduced
Solution Approach 1:
The patent replaces manual film analysis with automated electronic image processing. The detector system captures projection data and generates images that can be rapidly analyzed by computer algorithms, significantly increasing checking speed while maintaining or improving measurement precision through digital image analysis capabilities.
Solution Approach 2:
The patent creates digital copies of the projection data through the detector system, which can be repeatedly analyzed without degradation. Unlike physical films that require replacement after each use, the digital images can be stored, re-analyzed, and processed multiple times, improving both speed and precision of verification.
3Duration of action of stationary object
If frequent film replacement is required in traditional method, then continuous verification can be performed, but time is lost and efficiency decreases
Solution Approach 1:
The patent replaces consumable film with a reusable electronic detector system that maintains its functionality across multiple measurements. The detector can continuously capture projection data without requiring physical replacement, eliminating downtime associated with film changes and enabling continuous verification operations.
Solution Approach 2:
The patent eliminates the need to discard and replace physical films by using a durable electronic detector system. The detector recovers and reuses its sensing capability across multiple measurement cycles, maintaining verification continuity without time loss from replacement operations.
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
The system simplifies the isocenter verification process by directly converting projection data into image data without operator intervention, reducing the need for frequent radiation blocking body replacement and enhancing the precision and efficiency of radiotherapy equipment checks.
Implementation Method 1
a detector mounted on a position opposite to the treatment head, and the detector is configured to receive a radiation beam generated by the treatment head and convert the radiation beam into projection data
Implementation Method 2
the light spot and the shading are formed by a radiation beam generated by a treatment head of the radiotherapy equipment and then being blocked by a radiation blocking body
Data Source
AI summary
Provided is a method for checking consistency between a radiotherapy equipment isocenter and a treatment isocenter, wherein the method includes: acquiring projection data from a detector and generating image data based on the projection data, wherein the image data includes a light spot and a shading located in the light spot, and the light spot and the shading are formed by a radiation beam generated by a treatment head of the radiotherapy equipment and then being blocked by a radiation blocking body; and determining an offset between the radiotherapy equipment isocenter and the treatment isocenter based on the image data. A system and a device for checking consistency between a radiotherapy equipment isocenter and a treatment isocenter are also provided.