Magnetic Microstructures for Multiplexed MRI Cell Tagging
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Solution Overview
Problem
Magnetic resonance imaging (MRI) lacks the sensitivity and multiplexing capabilities to distinguish between different types of cells at the single-cell level, as existing contrast agents like superparamagnetic iron oxide nanoparticles and dendrimers suffer from continuous spatial decay of external fields, broadening water lines and obscuring distinct magnetic signals.
Innovation Solution
Development of magnetic resonance contrast agents with nonmagnetic media and dispersed magnetic structures, such as disk-shaped or cylindrical components, creating a local region with a homogeneous magnetic field that frequency-shifts water protons, enabling distinct spectral tagging and enhanced sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional superparamagnetic iron oxide nanoparticles are used for MRI cell tracking, then cell labeling capability is achieved, but the external magnetic field decays continuously in space causing water line broadening and loss of spectral distinction
Solution Approach 1:
The patent segments the magnetic field generation into discrete localized regions by using individual magnetic microstructures (spheres, disks, or cylinders) with engineered internal geometries. Each microstructure creates a confined homogeneous magnetic field region rather than allowing continuous spatial decay, enabling distinct spectral signatures for different cell types while maintaining field stability within each localized zone.
2Measurement precision
If existing magnetic contrast agents are used, then MRI imaging capability is provided, but sensitivity is insufficient to distinguish different cell types at single-cell level
Solution Approach 1:
The patent applies local quality by engineering each magnetic microstructure to create a localized homogeneous magnetic field region with specific field strength and spatial extent. Different microstructure geometries (spheres, disks, cylinders) produce different local field characteristics, enabling spectral distinction between cell types labeled with different microstructure types while maintaining overall low contrast agent concentration for safe biomedical application.
3Adaptability or versatility
If magnetic particles are used for cell labeling, then cellular tracking is enabled, but the continuous spatial decay of external fields broadens water lines and obscures distinction between different particle types
Solution Approach 1:
The patent changes the magnetic field parameters by engineering microstructures with different geometries (spheres, disks, cylinders) and varying internal compositions, which produce distinct homogeneous field strengths and spatial distributions. This parameter diversification enables multiplexed spectral encoding of different cell types while maintaining sharp spectral resolution through localized field homogeneity, overcoming the continuous decay problem of conventional particles.
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 solution significantly increases MRI sensitivity, reduces required concentrations of contrast agents, and allows for spectrally distinct micro-tags, enabling multiplexed color MRI and improved cellular labeling, with potential applications beyond MRI in biological research and diagnostics.
Implementation Method 1
creating a local region with a homogeneous magnetic field that frequency-shifts water protons
Implementation Method 2
nuclear magnetic moments of a material when arranged within the spatially extended region precess at a characteristic Larmor frequency corresponding to the total magnetic field in the local region
Implementation Method 3
the magnetic resonance contrast agent will emit a magnetic resonance signal at the characteristic Larmor frequency when the magnetic resonance contrast agent is irradiated with resonant RF electromagnetic radiation of the characteristic Larmor frequency
Data Source
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AI summary
A magnetic resonance contrast agent has a medium, and a contrast structure dispersed in the medium. The contrast structure comprises a magnetic material arranged to create a local region of a local magnetic field such that nuclear magnetic moments of a material when arranged within said local region precess at a characteristic Larmor frequency about a total magnetic field in the local region while in use, the characteristic Larmor frequency being identifiable with the contrast structure, and the total magnetic field in the local region being a substantially spatially uniform magnetic field.