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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 16 — Jun. 1, 2003
  • pp: 2940–2950

In vivo quantification of optical contrast agent dynamics in rat tumors by use of diffuse optical spectroscopy with magnetic resonance imaging coregistration

David J. Cuccia, Frederic Bevilacqua, Anthony J. Durkin, Sean Merritt, Bruce J. Tromberg, Gultekin Gulsen, Hon Yu, Jun Wang, and Orhan Nalcioglu  »View Author Affiliations


Applied Optics, Vol. 42, Issue 16, pp. 2940-2950 (2003)
http://dx.doi.org/10.1364/AO.42.002940


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Abstract

We present a study of the dynamics of optical contrast agents indocyanine green (ICG) and methylene blue (MB) in an adenocarcinoma rat tumor model. Measurements are conducted with a combined frequency-domain and steady-state optical technique that facilitates rapid measurement of tissue absorption in the 650–1000-nm spectral region. Tumors were also imaged by use of contrast-enhanced magnetic resonance imaging (MRI) and coregistered with the location of the optical probe. The absolute concentrations of contrast agent, oxyhemoglobin, deoxyhemoglobin, and water are measured simultaneously each second for approximately 10 min. The differing tissue uptake kinetics of ICG and MB in these late-stage tumors arise from differences in their effective molecular weights. ICG, because of its binding to plasma proteins, behaves as a macromolecular contrast agent with a low vascular permeability. A compartmental model describing ICG dynamics is used to quantify physiologic parameters related to capillary permeability. In contrast, MB behaves as a small-molecular-weight contrast agent that leaks rapidly from the vasculature into the extravascular, extracellular space, and is sensitive to blood flow and the arterial input function.

© 2003 Optical Society of America

OCIS Codes
(170.1470) Medical optics and biotechnology : Blood or tissue constituent monitoring
(170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics

History
Original Manuscript: September 6, 2002
Revised Manuscript: January 2, 2003
Published: June 1, 2003

Citation
David J. Cuccia, Frederic Bevilacqua, Anthony J. Durkin, Sean Merritt, Bruce J. Tromberg, Gultekin Gulsen, Hon Yu, Jun Wang, and Orhan Nalcioglu, "In vivo quantification of optical contrast agent dynamics in rat tumors by use of diffuse optical spectroscopy with magnetic resonance imaging coregistration," Appl. Opt. 42, 2940-2950 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-16-2940

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