Modular Cyclotron-Linac Ion Acceleration for Hadrontherapy
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Solution Overview
Problem
Current hadrontherapy systems, particularly those using cyclotrons and synchrotrons, are complex, large, and costly, and struggle to efficiently deliver therapeutic beams with variable energy and low current for medical applications, especially in hospital settings where compactness and low power consumption are essential.
Innovation Solution
A modular ion acceleration system combining a cyclotron with a high-frequency radiofrequency linear accelerator (Linac), featuring a Medium Energy Beam Transport (MEBT) and High Energy Beam Transport (HEBT) lines, allowing for active variation of beam energy and current, and optimized for compactness and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a synchrotron is used to accelerate ions to high energies for hadrontherapy, then the energy range and beam quality are improved, but the device complexity and installation volume increase significantly
Solution Approach 1:
The acceleration system is divided into two independent segments: a cyclotron for pre-acceleration and a Linac for final acceleration. Each segment operates independently with its own RF system and beam transport lines, allowing the system to achieve high energies without requiring a single complex synchrotron structure.
Solution Approach 2:
Beam transport lines with magnetic elements serve as intermediaries between the cyclotron and Linac, and between the Linac and the treatment area. These intermediaries guide and focus the beam through space, enabling modular architecture that reduces overall system complexity while maintaining high energy capability.
2Adaptability or versatility
If a synchrotron is used for ion acceleration, then variable energy beams are produced, but the installation surface area becomes too large for hospital environments
Solution Approach 1:
By segmenting the acceleration function between a compact cyclotron and a linear accelerator, the system achieves variable energy capability without requiring the large circular aperture of a synchrotron. The Linac's linear structure naturally occupies less space than a synchrotron's circular path would require.
Solution Approach 2:
The system transitions from a two-dimensional circular synchrotron geometry to a combination of three-dimensional cyclotron operation and linear Linac acceleration. This dimensional change allows the beam to be accelerated in a more space-efficient configuration that fits within hospital facilities.
3Quantity of substance
If conventional cyclotrons are used for carbon ion therapy, then the beam current is sufficient, but the magnet mass becomes excessively large for the required energy range
Solution Approach 1:
The cyclotron is used only for pre-acceleration to intermediate energies, not for the full energy range. The Linac completes the acceleration to therapeutic energies. This segmentation allows the cyclotron magnet to be much smaller and lighter than what would be required if a single cyclotron had to cover the entire energy spectrum.
Solution Approach 2:
The high-energy acceleration function is extracted from the cyclotron and transferred to a separate Linac system. This extraction removes the burden of requiring a massive cyclotron magnet for high-energy operation, as the Linac handles the final acceleration stage with significantly lower mass requirements.
4Use of energy by stationary object
If high-frequency Linac is used for ion acceleration, then power consumption is reduced and compactness is achieved, but beam transport and focusing become more challenging
Solution Approach 1:
Magnetic elements (quadrupoles, dipoles) serve as intermediaries in the beam transport lines, providing focusing and guiding functions that compensate for the challenges of high-frequency operation. These intermediaries enable the compact high-frequency Linac to achieve the same beam quality as larger, lower-frequency 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
The system reduces complexity and installation volume, achieves better beam quality, and lowers operational costs by enabling flexible energy and current adjustments, making it suitable for hospital installations and advanced radiotherapy techniques like spot scanning.
Implementation Method 1
a conventional or superconducting cyclotron, a radiofrequency linear accelerator (Linac)
Implementation Method 2
radiofrequency linear accelerator (Linac), featuring a Medium Energy Beam Transport (MEBT) and High Energy Beam Transport (HEBT) lines
Data Source
AI summary
System for ion acceleration for medical purposes comprising a conventional or superconducting cyclotron, a radiofrequency linear accelerator (Linac), a Medium Energy Beam Transport line (MEBT) connected, at the low energy side, to the exit of the cyclotron, and at the other side, to the entrance of the linear radiofrequency accelerator, as well as a High Energy Beam Transport line (HEBT) connected at high energy side to the radiofrequency linear accelerator exit and at the other end, to a system for the dose distribution to the patient.The high frequency of operation of the Linac allows for a reduced consumption and a remarkable compactness facilitating its installation in hospital structures. The use of a modular LINAC allows varying in active way the energy and the current of the therapeutic beam, having a small emittance and a time structure adapted to the dose distribution based on the technique known as the “spot scanning”.