Radiation Collimator Structure for Position-Based Dose Control
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Solution Overview
Problem
Existing radiation irradiation devices face challenges in adjusting radiation intensity and dose distribution based on the irradiation position, have complex structures, require multiple motors for each leaf, and suffer from radiation loss due to dose flattening filters.
Innovation Solution
A radiation irradiation device with X-axis and Y-axis shield plates and a target plate that can be moved laterally and longitudinally, controlled by a controller to adjust radiation intensity and dose distribution, eliminating the need for dose flattening filters and reducing the device's complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MLC or scanning-type radiation therapy device is used to adjust radiation intensity by position, then radiation intensity adjustment capability is improved, but device structure becomes complex and scale increases
Solution Approach 1:
The patent extracts and removes the dose flattening filter from the conventional radiation therapy device structure. This eliminates the need for complex MLC or scanning mechanisms while achieving uniform dose distribution through the collimator design alone, thereby simplifying the overall device structure while maintaining radiation intensity adjustment capability
Solution Approach 2:
The collimator structure is designed to perform multiple functions simultaneously: it defines the radiation field geometry, adjusts radiation intensity through aperture control, and achieves dose flattening through its specific geometric design. This multi-functionality eliminates the need for separate components, reducing device complexity
2Manufacturing precision
If MLC with multiple leaves and individual motors is used, then radiation intensity adjustment precision is improved, but device complexity and maintenance difficulty increase
Solution Approach 1:
The patent merges the functions of multiple leaves with individual motors into a single collimator structure with adjustable apertures. The collimator uses a smaller number of components that can be controlled by fewer drivers, achieving the same radiation intensity adjustment precision through combined geometric and positional control mechanisms
Solution Approach 2:
The collimator structure serves as a universal component that performs both field definition and intensity modulation functions that would otherwise require separate MLC leaves and motors, reducing the total component count while maintaining adjustment precision
3Manufacturing precision
If dose flattening filter is used to achieve uniform dose distribution, then dose distribution uniformity is improved, but radiation loss increases
Solution Approach 1:
The patent removes the dose flattening filter from the device architecture and replaces its function with a specifically designed collimator structure. This eliminates the radiation loss associated with the filter while achieving uniform dose distribution through the collimator's geometric design and aperture control mechanisms
Solution Approach 2:
The collimator acts as an intermediary structure that performs the dose flattening function previously requiring a separate filter component. Through its specific geometric configuration and aperture design, it achieves uniform dose distribution without the energy loss inherent in traditional filter-based approaches
Data Source
AI summary
Provided is a radiation irradiation device and method in which radiation intensity can be adjusted depending on an irradiation position. The device includes a radiation source, a target plate having an irradiation hole through which radiation emitted from the radiation source passes and having a first target stopper and a second target stopper formed to protrude on both surfaces, respectively, X-axis shield plates and Y-axis shield plates coupled to both sides of one surface of the target plate and including shield stoppers formed on a contact surface with the target plate and capable of being moved with respect to the target plate. The X-axis shield plate are coupled laterally with shield stoppers capable of moving laterally and the Y-axis plate are coupled longitudinally with shield stoppers capable of moving longitudinally. The shield stoppers can be moved between two first target stoppers or two second target stoppers adjacent to each other.