RF Power Distribution for Rapid Electron Beam Steering
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Solution Overview
Problem
Current radiation therapies are hindered by patient, target, and organ motion during treatment delivery, leading to prolonged treatment times and reduced precision, which can result in increased normal tissue toxicity and decreased tumor control efficacy.
Innovation Solution
A system utilizing a compact high-gradient, very high energy electron linear accelerator with electromagnetic or radiofrequency deflection steering, capable of delivering an entire radiation dose in less than 10 seconds, thereby freezing physiologic motion and enhancing dose conformity and tumor control efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radiation therapy delivery methods are used, then dose distribution accuracy is improved, but treatment time is prolonged (15-90 minutes per fraction)
Solution Approach 1:
The treatment delivery is segmented into multiple independent beam directions that can be executed in rapid succession. Instead of delivering radiation from one direction at a time using mechanical rotation, the system uses multiple fixed accelerator structures arranged around the patient, allowing parallel preparation and sequential delivery without mechanical movement delays.
Solution Approach 2:
The mechanical gantry rotation system is replaced with an electromagnetic/phased-array system. Multiple fixed accelerator structures use electronic phase control to direct beams from different angles, eliminating the need for slow mechanical rotation while maintaining the ability to deliver radiation from multiple directions for accurate dose distribution.
2Manufacturing precision
If motion management strategies are implemented, then treatment precision is improved, but treatment complexity and time are increased
Solution Approach 1:
The treatment is delivered so rapidly that physiologic motion is effectively frozen during the delivery process. By completing the entire treatment in seconds rather than minutes, the system eliminates the need for complex motion management strategies such as respiratory gating or real-time tracking, as the treatment is completed before significant motion can occur.
3Productivity
If multiple high-power RF sources are used to deliver rapid treatment, then treatment speed is improved, but system cost and complexity increase
Solution Approach 1:
Multiple lower-power RF sources are combined through a phased-array system to achieve the equivalent effect of a single high-power source. The RF power from multiple sources is coherently combined and directed to different accelerator structures, allowing rapid sequential beam delivery without requiring each individual source to be extremely high-power, thereby reducing overall system cost and complexity.
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 allows for rapid, precise radiation delivery with improved dose conformity and reduced toxicity, potentially increasing tumor control efficacy and reducing treatment time, while maintaining a compact and cost-effective system comparable to conventional photon therapy.
Implementation Method 1
an RF phase array coupling the RF power sources with the accelerating structures
Implementation Method 2
control a phase and an amplitude of the RF phase array such that a total RF energy from the RF power sources is directed to a select accelerating structure of the array through source phasing
Implementation Method 3
electromagnetic or radiofrequency deflection steering
Implementation Method 4
electromagnetic or radiofrequency deflection steering
Implementation Method 5
Each of the power sources may include a pulse compressor to boost a peak power output
Data Source
AI summary
Methods and system for facilitating rapid radiation treatments are provided herein and relate in particular to radiation generation and delivery, power production and distribution, and electron source design. The methods and systems described herein are particularly advantageous when used with a compact high-gradient, very high energy electron (VHEE) accelerator and delivery system (and related processes) capable of treating patients from multiple beam directions with great speed, using all-electromagnetic or radiofrequency deflection steering is provided, that can deliver an entire dose or fraction of high-dose radiation therapy sufficiently fast to freeze physiologic motion, yet with a better degree of dose conformity or sculpting than conventional photon therapy.