Magnetic Particle Imaging Non-Saturating Field Design
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Solution Overview
Problem
Current magnetic particle imaging techniques face challenges in producing high-resolution images of magnetic particles due to limitations in magnetic field design and signal processing, leading to suboptimal detection and visualization of magnetic particles in medical imaging applications.
Innovation Solution
The development of a magnetic particle imaging device that includes a magnetic field source producing a non-saturating magnetic field region, an excitation signal source generating detectable signals from magnetic particles within this region, and a signal processor converting these signals into detailed images, utilizing intermodulation techniques and adaptive scanning methods to enhance resolution and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field source produces non-saturating magnetic field region with excitation signal source, then image resolution is improved, but device complexity increases
Solution Approach 1:
The magnetic field source is divided into multiple independent coils (e.g., three orthogonal coils) that can be individually controlled to create the non-saturating magnetic field region. This segmentation allows precise spatial control of the magnetic field while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
The excitation signal source applies localized excitation signals specifically to the non-saturating magnetic field region where magnetic particles are present, rather than uniformly across the entire imaging volume. This local quality approach improves signal-to-noise ratio and image resolution by concentrating the excitation energy where it is most needed.
2Loss of time
If adaptive scanning methods are used, then scanning time is reduced, but signal processing complexity increases
Solution Approach 1:
The scanning method dynamically adjusts the trajectory and timing of magnetic field application based on real-time signal feedback. The system optimizes the scanning path adaptively, concentrating measurement time in regions with higher magnetic particle concentration while reducing sampling in low-signal regions, thereby reducing overall scanning time.
Solution Approach 2:
The signal processor uses feedback from detected magnetic particle signals to continuously optimize the scanning parameters and trajectory. This feedback mechanism allows the system to adaptively refine the scanning path based on actual signal quality, reducing unnecessary scanning time while maintaining image quality.
3Measurement precision
If intermodulation techniques are applied, then signal-to-noise ratio is enhanced, but device complexity increases
Solution Approach 1:
The excitation signal source applies periodic magnetic field oscillations at multiple distinct frequencies simultaneously. The magnetic particles respond nonlinearly to these periodic excitations, generating intermodulation signals at sum and difference frequencies. This periodic action creates characteristic signal patterns that are highly resistant to noise, enhancing the signal-to-noise ratio.
Solution Approach 2:
The intermodulation technique exploits the nonlinear magnetic response of particles to oscillating fields, analogous to mechanical vibration analysis. By driving the system at multiple frequencies and detecting the nonlinear intermodulation products, the system achieves enhanced signal detection capability similar to vibration-based defect detection methods.
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 enables the production of high-resolution images of magnetic particles, improving the detection and visualization of magnetic particles in medical imaging, particularly in applications like blood vessel imaging, by enhancing signal-to-noise ratio and reducing scanning time while maintaining low specific absorption rate.
Implementation Method 1
a magnetic field source configured to produce a magnetic field having a non-saturating magnetic field region
Implementation Method 2
an excitation signal source configured to produce an excitation signal in the non-saturating magnetic field region that produces a detectable signal from magnetic particles
Data Source
AI summary
A magnetic particle imaging device is provided. The device includes a magnetic field source configured to produce a magnetic field having a non-saturating magnetic field region, an excitation signal source configured to produce an excitation signal in the non-saturating magnetic field region that produces a detectable signal from magnetic particles in the non-saturating magnetic field region, and a signal processor configured to convert a detected signal into an image of the magnetic particles. Aspects of the present disclosure also include methods of imaging magnetic particles in a sample, and methods of producing an image of magnetic particles in a subject. The subject devices and methods find use in a variety of applications, such as medical imaging applications.