Dual-Size Contrast Agent Segmentation for Simultaneous Vascular and Stromal Imaging
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Solution Overview
Problem
Current medical imaging technologies face challenges in simultaneously imaging the vascular and stromal systems of cancer tissues due to the size limitations of contrast agents, which either fail to penetrate vascular endothelial cell gaps or are phagocytosed by macrophages, leading to inadequate contrast enhancement of either the blood vessels or cancer tissues.
Innovation Solution
A medical image diagnostic apparatus using contrast agents with blood vessel contrast enhancement particles larger than vascular endothelial cell gaps and cancer contrast enhancement particles smaller than these gaps, along with specific modifications such as chemical bonding to albumin or ligands, to target and enhance imaging of both systems independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If nanoparticles with small particle size are used, then penetration through vascular endothelial cell gaps is improved, but imaging of blood vessels is compromised
Solution Approach 1:
The contrast agent is segmented into two distinct particle populations: small nanoparticles (5-50 nm) for stromal system penetration and large microparticles (50-200 nm) for blood vessel imaging. This segmentation allows each particle type to fulfill its specific imaging function without interference, resolving the contradiction between penetration capability and blood vessel imaging reliability
2Length of moving object
If nanoparticles with large particle size are used, then blood vessel imaging is improved, but penetration through vascular endothelial cell gaps is compromised
Solution Approach 1:
The contrast agent is segmented into two distinct particle populations: small nanoparticles (5-50 nm) for stromal system penetration and large microparticles (50-200 nm) for blood vessel imaging. This segmentation allows each particle type to fulfill its specific imaging function without interference, resolving the contradiction between penetration capability and blood vessel imaging reliability
3Ease of manufacture
If single particle size contrast agents are used, then manufacturing simplicity is maintained, but simultaneous imaging of both vascular and stromal systems is compromised
Solution Approach 1:
The contrast agent is segmented into two distinct particle populations with different size ranges and functional properties. Each population is optimized for specific imaging targets, enabling simultaneous dual-system imaging while maintaining relatively simple manufacturing processes for each particle type
Solution Approach 2:
The contrast agent comprises a composite system of two different particle types (nanoparticles and microparticles) with distinct size ranges and functional characteristics. This composite structure enables multifunctionality, allowing simultaneous imaging of both vascular and stromal systems while maintaining ease of manufacture for each component
Data Source
AI summary
According to one embodiment, a medical image diagnostic apparatus includes an imaging unit, an image generation unit, and a display unit. The imaging unit images a subject injected with blood vessel contrast enhancement particles and diseased tissue contrast enhancement particles. The blood vessel contrast enhancement particles have the first particle size larger than the gap of vascular endothelial cells under the EPR effect. The diseased tissue contrast enhancement particles have the second particle size smaller than the gap. The image generation unit generates a medical image associated with an imaging region of the subject based on output data from the imaging unit. The display unit displays the medical image.