NIR-activated iron oxides as a new multi-functional contrast agent of photoacoustic imaging

Pei Hsien Ting, Chih-Chia Huang, Meng Lin Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


Iron oxide nanoparticles are commonly used contrast agents for theranostic nanomedicines because of their advantages of good biocompatibility, high stability in physiological conditions, low cytotoxicity and excellent safety record in clinical settings for human use. In this study, we developed a NIR-activated iron oxide (NIR-Fe3O4) nanoparticle as a new multi-functional contrast agent of photoacoustic (PA) imaging. Unlike traditional iron oxides, the developed NIR-Fe3O4 owns biocompatibility and optical tunability capable of providing strong optical absorption in the NIR range for PA signal generation. Its intrinsic magnetic property enables the active magnetic tumor targeting. Phantom experiments were performed to confirm the tunability of NIR-Fe3O4's optical absorption in NIR and demonstrate its magnetic targeting capability. The PA signal response of NIR-Fe3O4 as a function of concentration was also investigated. The results showed that the PA signal of NIR-Fe3O4 with OD=1.25 was comparable to that of blood at 715 nm - the wavelength of peak absorption of the used NIR-Fe3O 4. Moreover, the PA signal from NIR-Fe3O4 could be further improved by magnetic targeting. Overall, we proved that the potential of the developed NIR-Fe3O4 as a good tumor targeting contrast agent of PA imaging.

Original languageEnglish
Title of host publicationPhotons Plus Ultrasound
Subtitle of host publicationImaging and Sensing 2014
ISBN (Print)9780819498564
Publication statusPublished - 2014 Jan 1
EventPhotons Plus Ultrasound: Imaging and Sensing 2014 - San Francisco, CA, United States
Duration: 2014 Feb 22014 Feb 5

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


OtherPhotons Plus Ultrasound: Imaging and Sensing 2014
Country/TerritoryUnited States
CitySan Francisco, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging


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