Compact RF Apparatus with Flexible Waveguide for Rotatable Gantries
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Solution Overview
Problem
Designing a beam generation subsystem for radiotherapy systems that enables high performance and versatile gantry movement is challenging due to the complexity and size of conventional RF apparatus, making it difficult to implement on a rotatable gantry.
Innovation Solution
The use of a compact RF apparatus with a three-port circulator and flexible waveguide arrangement, which reduces the overall size and allows stable RF power transmission, enabling efficient mounting on a rotatable gantry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RF apparatus is used in radiotherapy systems, then reliable RF power transmission is achieved, but the device size and complexity increase, making it difficult to implement on a rotatable gantry
Solution Approach 1:
The RF apparatus is divided into separate functional modules: a RF power source, a three-port circulator, and a transmission waveguide. This segmentation allows each component to be optimized independently and reduces the overall complexity while maintaining reliable RF power transmission to the acceleration waveguide.
Solution Approach 2:
A three-port circulator is introduced as an intermediary device between the RF power source and the transmission waveguide. The circulator manages RF power flow directionally, isolating the power source from reflections and ensuring stable power transmission, thereby reducing the complexity of direct connections.
2Power
If conventional RF apparatus is used, then sufficient RF power is provided, but the mechanical performance and versatility of the gantry are limited due to size constraints
Solution Approach 1:
The transmission waveguide is designed to be flexible rather than rigid, allowing it to accommodate dynamic movements of the rotatable gantry. This flexibility enables the RF apparatus to maintain stable connections during gantry rotation and positioning, enhancing the versatility of the system without compromising RF power delivery.
Solution Approach 2:
The use of a flexible transmission waveguide allows the RF apparatus to adapt to the mechanical movements of the gantry. The flexible waveguide maintains RF power transmission while accommodating changes in position and orientation, thereby enabling versatile gantry movement without power loss.
3Adaptability or versatility
If a compact RF apparatus is designed, then the gantry versatility is improved, but the stability of RF power transmission may be compromised
Solution Approach 1:
The three-port circulator provides automatic feedback control for RF power flow. It monitors the RF conditions and adjusts the power direction accordingly, ensuring stable power transmission to the acceleration waveguide while maintaining a compact apparatus design suitable for gantry mounting.
Solution Approach 2:
The circulator acts as an intermediary that stabilizes RF power transmission by isolating the power source from load variations and reflections. This intermediary component ensures reliable power delivery while maintaining the compact design needed for gantry versatility.
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 configuration facilitates improved mechanical performance and versatility of the gantry, allowing for more precise and efficient delivery of radiotherapy treatments by reducing system size and enhancing alignment with the rotatable gantry.
Implementation Method 1
The RF apparatus comprises an RF power source arranged to transmit RF power towards a three-port circulator along a first direction. The three-port circulator is arranged to transmit the RF power towards a transmission waveguide along that first direction.
Implementation Method 2
The transmission waveguide is arranged to be coupled to an acceleration waveguide. The transmission waveguide is flexible and is arranged to accommodate mechanical movement of a rotatable gantry.
Implementation Method 3
The acceleration waveguide is arranged to accelerate electrons into a target to generate X-rays.
Implementation Method 4
The acceleration waveguide is arranged to accelerate electrons into a target to generate X-rays.
Data Source
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AI summary
Disclosed herein is radiofrequency, RF, apparatus for a radiotherapy system, the RF apparatus comprising an RF power source, a three-port circulator; and a transmission waveguide arranged to be coupled to an acceleration waveguide, wherein the RF power source is arranged to transmit RF power towards the three-port circulator along a first direction and the three-port circulator is arranged to transmit RF power towards the transmission waveguide along the first direction.