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Near infrared imaging with nanoparticles
Erhan I Altinoğlu1, James H Adair
1Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
|February 6, 2010
Summary
Near-infrared (NIR) imaging uses nanoparticle contrast agents for deep tissue diagnostics. Calcium phosphate nanoparticles offer a non-toxic, bioresorbable alternative to quantum dots and gold nanoshells for enhanced NIR imaging.
Area of Science:
- Biomedical Imaging
- Nanotechnology
- Materials Science
Background:
- Near-infrared (NIR) imaging is a minimally invasive diagnostic technique.
- Nanoparticle (NP)-based NIR contrast agents offer advantages over organic agents, including reduced photobleaching and instability.
- Current NP contrast agents like quantum dots (QDs) and gold nanoshells present toxicity and accumulation concerns.
Purpose of the Study:
- To review the applications of various nanoparticle-based NIR contrast agents.
- To compare the optical performance, stability, and biocompatibility of different NP contrast agents.
- To highlight calcium phosphate nanoparticles (CPNPs) as a promising, non-toxic alternative.
Main Methods:
- Review of existing literature on NP-based NIR contrast agents.
- Discussion of NIR-emitting semiconductor quantum dots (QDs).
- Analysis of resonant gold nanoshells.
- Examination of dye-encapsulating nanoparticles, specifically calcium phosphate nanoparticles (CPNPs).
Main Results:
- NIR QDs offer superior optical performance but have toxicity concerns.
- Gold nanoshells provide high signal intensity but face issues with organ accumulation.
- CPNPs enhance optical performance of dyes, are non-toxic, and readily bioresorbable.
- CPNPs improve quantum yields, brightness, and fluorescent lifetime.
Conclusions:
- Nanoparticle contrast agents significantly advance NIR imaging capabilities.
- Calcium phosphate nanoparticles represent a safe, effective, and bioresorbable option for NIR imaging.
- CPNPs provide a viable alternative to current NP contrast agents with significant clinical potential.
