Asymmetric Bilateral MPI Device for Deep Imaging
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Solution Overview
Problem
Existing magnetic particle imaging (MPI) devices face limitations in imaging range and depth, particularly for human trunk positions, due to the attenuation of magnetic field distribution in unilateral structures and the complexity of symmetrical bilateral structures.
Innovation Solution
An MPI device based on an asymmetric bilateral structure is designed, comprising a fixed section with magnetic field generation coils and a movable section with a permanent magnet, excitation coils, and a reception coil. This configuration allows for a large imaging field of view with reduced power consumption and high spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a unilateral structure is used in MPI device, then the device size is small and power consumption is low, but the imaging depth is limited and magnetic field distribution attenuates with distance
Solution Approach 1:
The patent employs an asymmetric bilateral structure where the permanent magnet assembly is positioned offset from the center of the coil assembly, creating an asymmetric magnetic field distribution. This asymmetric configuration enables the system to achieve both deep imaging capability and controlled field of view, resolving the contradiction between imaging depth and power consumption by optimizing the spatial relationship between magnetic field generation components rather than using symmetric configurations that require higher power
2Length of stationary object
If a symmetrical bilateral structure is used in MPI device, then the imaging depth is unlimited and linearity is high, but the device size becomes large and power consumption increases
Solution Approach 1:
The patent deliberately introduces asymmetry by positioning the permanent magnet assembly offset from the center of the coil assembly, creating an asymmetric bilateral structure. This asymmetric configuration allows the system to achieve deep imaging capability similar to symmetric structures while reducing the overall device size and power consumption by optimizing the spatial distribution of magnetic field components
Solution Approach 2:
The patent applies local quality by creating a controlled field of view through the asymmetric configuration, where the magnetic field strength and distribution are optimized for specific imaging regions. This allows deep imaging in targeted areas without requiring uniform high-field coverage throughout the entire symmetric structure, thereby reducing overall power consumption
3Area of stationary object
If the field of view increases in MPI device, then the imaging coverage is improved, but the gradient of the selected field decreases rapidly leading to decline in imaging quality
Solution Approach 1:
The asymmetric bilateral structure creates a controlled field of view with optimized local magnetic field gradients. By positioning the permanent magnet assembly asymmetrically, the system concentrates magnetic field strength in specific regions of interest while maintaining adequate coverage, thereby preserving imaging quality in the selected field without requiring uniform gradients across a large symmetric field of view
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 asymmetric bilateral structure MPI device achieves real-time three-dimensional spatial imaging with improved imaging depth and field of view, addressing the limitations of existing devices while maintaining a simple structure and low power consumption.
Implementation Method 1
the magnetic field generation coils are configured to generate a uniform and variable magnetic field and drive the FFP to move along a Z-axis direction
Implementation Method 2
The permanent magnet is configured to cooperate with the magnetic field generation coils to generate the FFP
Implementation Method 3
The excitation coils are configured to move the FFP on a two-dimensional plane and excite magnetic particles to generate a nonlinear response signal
Implementation Method 4
The reception coil is configured to receive an MPI signal
Data Source
AI summary
A magnetic particle imaging (MPI) device based on an asymmetric bilateral structure includes a fixed section and a movable section. The fixed section includes a pair of magnetic field generation coils, and the magnetic field generation coils are configured to generate a uniform and variable magnetic field and drive a field-free point (FFP) to move along a Z-axis direction. The movable section includes a permanent magnet, excitation coils and a reception coil. The permanent magnet is configured to cooperate with the magnetic field generation coils to generate the FFP. The excitation coils are configured to move the FFP on a two-dimensional plane and excite magnetic particles to generate a nonlinear response signal. The reception coil is configured to receive an MPI signal. The MPI device is simple in structure and convenient to operate, and can perform targeted local imaging or covered overall imaging on the target object.