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Published on: July 17, 2012
[Self-made ultrasound/fluorescent bi-functional contrast agent for rabbit's normal lymph node imaging]
En-ze Qu1, Zhi-fei Dai, Shu-min Wang
1Department of Ultrasound, Peking University Third Hospital, Beijing, China.
Summary
Researchers developed a novel bi-functional contrast agent for enhanced ultrasound (CEUS) and near-infrared fluorescence (NIR) imaging. This agent effectively visualizes lymph nodes and lymphatic vessels in animal models, showing promise as a lymph node tracer.
Area of Science:
- Biomedical Imaging
- Nanotechnology
- Pharmacology
Background:
- Accurate lymph node imaging is crucial for diagnosing and staging diseases like cancer.
- Current imaging techniques have limitations in sensitivity and specificity for lymph node evaluation.
- Development of targeted contrast agents can improve diagnostic accuracy.
Purpose of the Study:
- To synthesize and characterize a novel bi-functional contrast agent for simultaneous contrast-enhanced ultrasound (CEUS) and near-infrared fluorescence (NIR) imaging.
- To evaluate the efficacy of this agent in targeting and visualizing lymph nodes and lymphatic vessels in vivo.
- To assess the agent's performance in animal models for potential clinical application as a lymph node tracer.
Main Methods:
- Bi-functional contrast microbubbles were prepared by conjugating a lymph node-targeted ligand (phosphatidylserine) with a near-infrared fluorescent substance.
- Morphology and size distribution of the microbubbles were analyzed using optical microscopy and Malvern potential tests.
- The contrast agent was administered to New Zealand white rabbits, and imaging was performed using CEUS and NIR techniques. Lymph node pathological examination was conducted post-sacrifice.
Main Results:
- The prepared lipid ultrasound microbubbles exhibited uniform distribution and regular configuration with a mean size of 3-5 μm.
- CEUS and NIR imaging successfully visualized lymphatic vessels and target lymph nodes shortly after subcutaneous injection.
- NIR imaging results were consistent with blue dye staining in pathological examination, confirming accurate lymph node display.
Conclusions:
- The developed bi-functional contrast agent demonstrates effective imaging capabilities in both CEUS and NIR modalities.
- This agent shows significant potential as an improved tracer for lymph node imaging.
- The study highlights the utility of targeted microbubbles for multimodal biomedical imaging.
