Multi-Isocenter Radiotherapy Positioning Using Three-Sequence Imaging
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Solution Overview
Problem
The radiosurgery robot system faces issues with poor positioning due to blocked treatment spaces and limited imaging capabilities, particularly when the two-sequence imaging system is obstructed by the treatment head, leading to inaccurate positioning.
Innovation Solution
A radiotherapy system with a three-sequence image-guided positioning system, comprising multiple low-level and high-level image-guided positioning systems, allowing for a fully-spherical treatment space by using a multi-degree-of-freedom robot to project beams from various angles and positions, ensuring unblocked imaging paths and accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-sequence imaging system is used in the low-level treatment center mode, then the system structure is simplified, but the positioning accuracy deteriorates when treatment nodes are blocked
Solution Approach 1:
The imaging system is segmented into three independent imaging sequences (first, second, and third sequences) with different beam paths and detection angles. This segmentation allows selective use of unblocked sequences during treatment, ensuring positioning accuracy even when certain treatment nodes obstruct other imaging paths.
Solution Approach 2:
The system transitions from a two-sequence imaging system to a three-sequence system, adding another dimension of imaging capability. The third imaging sequence provides an additional independent viewing angle that is not blocked by treatment nodes, enabling accurate positioning from multiple spatial dimensions.
2Area of stationary object
If the treatment head is positioned to treat certain nodes, then the treatment coverage is improved, but the imaging path becomes blocked
Solution Approach 1:
The system dynamically selects which imaging sequence to use based on the current treatment node position. When the treatment head is positioned to treat certain nodes that block specific imaging paths, the system automatically switches to alternative unblocked sequences, maintaining both treatment coverage and positioning accuracy throughout the dynamic treatment process.
Solution Approach 2:
The third imaging sequence acts as an intermediary solution when the first or second sequences are blocked by treatment nodes. This additional imaging path provides an alternative route for obtaining positioning information without interfering with the treatment delivery to blocked nodes.
3Adaptability or versatility
If multiple treatment centers are used to achieve fully-spherical treatment space, then the treatment versatility is improved, but the system complexity increases
Solution Approach 1:
The three imaging sequences are designed with universal functionality, where each sequence can serve both imaging and treatment reference purposes. The first and second sequences serve the low-level treatment center, while the third sequence serves the high-level treatment center, but all three can contribute to positioning accuracy across the entire fully-spherical treatment space, reducing the need for separate dedicated systems.
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
Enables effective treatment across a fully-spherical space with optimized dose distribution, allowing for accurate positioning and improved treatment outcomes by utilizing unblocked imaging sequences and switching between low-level and high-level treatment centers.
Implementation Method 1
The three-sequence image-guided positioning system includes multiple low-level image-guided positioning systems corresponding to a low-level treatment center and a high-level image-guided positioning system corresponding to a high-level treatment center
Data Source
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Figure 5A
AI summary
A radiotherapy system based on multi-isocenter includes an accelerator and a three-sequence image-guided positioning system. The three-sequence image-guided positioning system includes multiple low-level image-guided positioning systems corresponding to a low-level treatment center and a high-level image-guided positioning system corresponding to a high-level treatment center. The high-level image-guided positioning system is arranged among the multiple low-level image-guided positioning systems. The intersection of two beams generated by any two image-guided positioning systems among the low-level image-guided positioning systems and the high-level image-guided positioning system is the low-level treatment center. A beam generated by the high-level image-guided positioning system passes through the high-level treatment center. Multiple treatment nodes with the low-level treatment center as a spherical center and multiple treatment nodes with the high-level treatment center as a spherical center form a fully-spherical treatment space.