Helical Tomotherapy Phantom Positioning Device
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Solution Overview
Problem
Current methods for verifying helical tomotherapy plans are inefficient and prone to inaccuracies due to the manual repositioning of three-dimensional verification phantoms, limited movement range, and potential damage from high-energy rays.
Innovation Solution
An automatic positioning device for helical tomotherapy plan verification, featuring a base on the treatment bed, a lifting platform, a moving platform, and an early warning component, allowing for three-axis movement of the verification phantom and real-time monitoring of radiation dose to prevent circuit damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual repositioning of the three-dimensional verification phantom is used for each patient's radiotherapy plan verification, then the positioning can be adjusted to match the red laser light position, but the process is time-consuming and reduces plan verification efficiency
Solution Approach 1:
The system automatically positions the verification phantom by receiving the red laser light position information and controlling the treatment bed to move the phantom to the corresponding position, eliminating the need for manual repositioning operations while maintaining positioning accuracy
Solution Approach 2:
The manual mechanical positioning operation is replaced by an automated control system that receives laser position data and automatically adjusts the treatment bed position, substituting human operation with an automated control mechanism
2Stability of the object's composition
If the treatment bed movement range is limited to 2.5cm in left-right direction, then the treatment bed can maintain stability, but the positioning center deviates for eccentric tumors and causes positioning bias
Solution Approach 1:
The system dynamically adjusts the treatment bed position based on the red laser light position information, allowing the positioning to adapt to different tumor locations including eccentric tumors, while maintaining stability during the verification process
3Device complexity
If the three-dimensional verification phantom is directly placed on the treatment bed, then the setup is simple, but the phantom is at risk of falling and may not be positioned smoothly for eccentric tumors
Solution Approach 1:
A positioning device is introduced as an intermediary between the treatment bed and the verification phantom, providing stable support and positioning control while maintaining relative simplicity in the overall system structure
4Productivity
If high-energy rays irradiate the circuit board part of the verification equipment, then the treatment can proceed, but the circuit board cannot work properly causing measurement inaccuracy or equipment malfunction
Solution Approach 1:
The early warning component monitors the radiation dose in real-time and provides alerts before the circuit board receives damaging levels of radiation, allowing the system to take protective action and convert the potential harmful effect into a controlled situation
Data Source
AI summary
An automatic positioning device for helical tomotherapy plan verification is provided. The device includes a base located on a treatment bed of helical tomotherapy equipment, a lifting platform fixedly connected to a top of the base, a three-dimensional verification phantom fixedly connected to other ends of the two support rods, and an early warning component. A bearing platform is fixedly connected to a top of the lifting platform, a moving platform is arranged on the bearing platform, and ends of two support rods are fixedly connected to a side, close to the treatment bed, of the moving platform. The three-dimensional verification phantom extends into a treatment aperture through the moving platform. The early warning component includes two early warning pieces respectively arranged on the two support rods.