Nanowontons for Dual-Modality MRI and Photoacoustic Imaging
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Solution Overview
Problem
Current imaging modalities lack dual-modality nanoparticles capable of effectively combining magnetic resonance imaging (MRI) and photoacoustic tomography (PAT) for enhanced tissue examination and therapy, with existing nanoparticles not addressing both modalities simultaneously.
Innovation Solution
Development of layered nanoparticles, known as nanowontons, with a biocompatible gold coating and a ferromagnetic cobalt core, designed to absorb radiation across various wavelengths, allowing for dual-modality imaging and therapy by encapsulating toxic or reactive materials within biocompatible layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic nanoparticles are used for MRI contrast enhancement, then image contrast is improved, but the particles require biocompatible coatings that add structural complexity
Solution Approach 1:
The patent employs composite nanoparticle structures combining magnetic cores (e.g., magnetite, iron oxide) with biocompatible coatings (e.g., dextrin, silica, gold). This composite approach enables the particle to simultaneously provide MRI contrast enhancement through the magnetic core while the coating layer ensures biocompatibility and stability in physiological environments, thus resolving the contradiction between achieving measurement precision and managing device complexity
Solution Approach 2:
The patent implements nested core-shell structures where the magnetic material is enclosed within a biocompatible coating layer. This nesting configuration allows the inner magnetic core to perform its imaging function while the outer shell provides protective and biocompatible interfaces, effectively managing the structural complexity required for both MRI performance and biological safety
2Adaptability or versatility
If dual-modality nanoparticles for MRI and PAT are developed, then imaging versatility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent designs nanoparticles with multi-functional capabilities by integrating both MRI-active magnetic materials and PAT-active optical materials into single particle structures. These universal nanoparticles can simultaneously participate in magnetic resonance imaging and photoacoustic tomography, enabling dual-modality imaging versatility while the patent provides systematic manufacturing approaches to manage the synthesis complexity
Solution Approach 2:
The patent merges previously separate MRI contrast agents and PAT contrast agents into unified dual-modality nanoparticles. By combining magnetic materials (for MRI) and optically active materials (for PAT) within the same particle architecture, the invention achieves imaging versatility across two modalities while establishing integrated synthesis protocols that address the manufacturing challenges
3Measurement precision
If toxic materials are used in the core for enhanced imaging properties, then imaging performance is improved, but biocompatibility deteriorates
Solution Approach 1:
The patent employs nested core-shell structures where toxic or highly reactive imaging materials are enclosed within biocompatible coating layers. The inner core contains materials with superior imaging properties (such as magnetic nanoparticles for MRI or metallic cores for PAT), while the outer shell provides biocompatible interfaces that prevent direct contact with biological systems, thus resolving the contradiction between imaging sensitivity and toxicity
Solution Approach 2:
The patent introduces biocompatible coating materials as intermediary layers between the toxic core materials and the biological environment. These coating layers (such as dextrin, silica, or gold shells) act as mediators that maintain the imaging performance of the core materials while eliminating their harmful effects on biological systems, enabling safe in vivo applications
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 nanowontons enable sensitive detection at picomolar concentrations, combining the strengths of MRI and PAT for improved imaging sensitivity and therapeutic applications, with the gold coating providing biocompatibility and tunable absorption spectra.
Implementation Method 1
a ferromagnetic cobalt core
Implementation Method 2
magnetic resonance imaging (MRI)
Implementation Method 3
absorb radiation across various wavelengths
Implementation Method 4
photoacoustic tomography (PAT)
Data Source
AI summary
In certain embodiments novel nanoparticles (nanowontons) are provided that are suitable for multimodal imaging and/or therapy. In one embodiment, the nanoparticles include a first biocompatible (e.g., gold) layer, an inner core layer (e.g., a non-biocompatible material), and a biocompatible (e.g., gold) layer. The first gold layer includes a concave surface that forms a first outer surface of the layered nanoparticle. The second gold layer includes a convex surface that forms a second outer surface of the layered nanoparticle. The first and second gold layers encapsulate the inner core material layer. Methods of fabricating such nanoparticles are also provided.