Combined Filter-Collimator Positioning for Discrete X-Ray Imaging
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Solution Overview
Problem
The complexity in positioning bow-tie filters and collimators in radiation therapy systems for precise imaging beam shaping and uniformity, particularly in image-guided radiation therapy, where independent and precise positioning of these components is required to minimize healthy tissue exposure and maximize image quality.
Innovation Solution
A simplified filter and collimator positioning mechanism in radiation therapy systems, where a combined filter-collimator assembly is used, allowing for fixed positions of the X-ray imager relative to the X-ray source, reducing the need for complex real-time adjustments and employing discrete collimator-filter configurations for specific imaging positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If independent positioning systems are used for bow-tie filter and collimator, then precise imaging beam shaping and uniformity are achieved, but device complexity and mechanical complexity increase
Solution Approach 1:
The patent combines the bow-tie filter and collimator into a single integrated assembly that is positioned as one unit. This merging of components reduces the number of independent positioning systems needed while maintaining the precise beam shaping and uniformity requirements through the coordinated design of the combined assembly.
2Adaptability or versatility
If multiple independent collimator blades are used for flexible image acquisition, then adaptability is improved, but device complexity increases
Solution Approach 1:
The integrated filter-collimator assembly is designed to perform multiple functions simultaneously: the bow-tie filter provides beam uniformity while the collimator blades provide beam shaping and field-of-view control. This multi-functional design achieves flexible image acquisition for various anatomical regions without requiring separate positioning systems for each component.
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 simplifies the imaging system, reduces mechanical complexity, and maintains image quality by ensuring uniform beam intensity across the imager, while minimizing exposure to healthy tissues, thus enhancing the precision and efficiency of radiation therapy.
Implementation Method 1
RT systems commonly include shaped filters, referred to as 'bow-tie' filters, which are in the path of an imaging beam and maintain a more uniform distribution of X-ray photons across the field of view
Implementation Method 2
to limit the size and shape of an imaging beam, and to limit X-ray scatter that can degrade image quality, a collimator is also typically positioned in the path of the imaging beam
Data Source
AI summary
A radiation therapy system includes an X-ray imaging system that is configured with a combined and simplified filter and collimator positioning mechanism. In addition, an X-ray imager of the RT system is only positioned at a few discrete locations within a plane that is a fixed distance from the imaging X-ray source when generating X-ray images. As a result, for each of these discrete imaging positions, the simplified filter and collimator positioning mechanism positions a specific collimator-filter combination in a specific location between the X-ray source and the imager.