MRI Main Field Coil Layout for Beam-Aligned Radiation Therapy
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Solution Overview
Problem
The interference between the magnetic field of MRI devices and the particle accelerator of RT devices, causing artifacts and image distortion, complicates accurate tumor tracking during radiography treatment.
Innovation Solution
The MRI device incorporates main field coils arranged in a specific configuration, including groups of coils with bent parts and a preset angle, generating a main magnetic field that aligns with the radiation beam direction to minimize deviation and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the MRI device and RT device are combined to provide real-time imaging during treatment, then tumor tracking accuracy is improved, but magnetic field interference causes artifacts and image distortion
Solution Approach 1:
A vacuum container is introduced as an intermediary structure between the MRI and RT components. The vacuum container isolates the magnetic field from the particle accelerator components, preventing magnetic interference with the radiation beam while allowing both systems to coexist in the same treatment space.
Solution Approach 2:
The treatment system is segmented into distinct functional zones: an MRI imaging zone with magnetic field generation capability and an RT treatment zone with particle accelerator components. The vacuum container creates physical separation between these zones, allowing each to operate independently without interfering with the other.
2Reliability
If main field coils are arranged in conventional configurations, then MRI imaging function is achieved, but magnetic field deviation from radiation beam direction causes particle loss
Solution Approach 1:
The main field coils are arranged in an asymmetric configuration where the magnetic field direction is intentionally deviated from the conventional orientation. The magnetic field forms a preset angle with the radiation beam direction, creating an asymmetric arrangement that reduces particle loss while maintaining imaging functionality.
Solution Approach 2:
The orientation parameter of the main magnetic field is changed relative to the radiation beam direction. By adjusting the angle between the magnetic field and beam direction to a preset value, the system optimizes particle transmission while preserving MRI imaging capability.
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 stabilizes the radiation beam transmission, reduces particle loss, and enhances the dosage rate while ensuring homogeneous magnetic field uniformity, facilitating precise tumor tracking and treatment.
Implementation Method 1
a main magnet configured to generate a main magnetic field... The main magnet may include at least one group of main field coils... A direction of the main magnetic field generated by the at least one group of main field coils may form a preset angle with an axial direction of the accommodation space
Implementation Method 2
In occasions with an outer magnetic field, charged particles of the particle beam would deviate from the straight trajectory due to the Lorentz force
Data Source
AI summary
The present disclosure provides a magnetic resonance imaging (MRI) device. The MRI device may include a main magnet configured to generate a main magnetic field. The main magnet may form an accommodation space configured to accommodate a target object. The main magnet may include at least one group of main field coils. A direction of the main magnetic field generated by the at least one group of main field coils may form a preset angle with an axial direction of the accommodation space. The at least one group of main field coils may include a first group of main field coils and a second group of main field coils that are arranged oppositely along a radial direction of the accommodation space. Each of the first group of main field coils and the second group of main field coils may bend towards each other.