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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 14 — May. 10, 2007
  • pp: 2785–2792

Intraoperative monitoring of depth-dependent hemoglobin concentration changes during carotid endarterectomy by time-resolved spectroscopy

Chie Sato, Takekane Yamaguchi, Mitsuru Seida, Yoshihisa Ota, Iwae Yu, Yoshinobu Iguchi, Masahito Nemoto, and Yoko Hoshi  »View Author Affiliations


Applied Optics, Vol. 46, Issue 14, pp. 2785-2792 (2007)
http://dx.doi.org/10.1364/AO.46.002785


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Abstract

By measuring the adult human head during carotid endarterectomy, we investigate the depth sensitivity of two methods for deriving the absorption coefficient changes ( Δ μ a ) from time-resolved reflectance data to absorption changes in inhomogeneous media: (1) the curve-fitting method based on the diffusion equation (DE-fit method) and (2) the time-independent calculation based on the modified Lambert–Beer law (MLB method). Remarkable differences in the determined values of Δ μ a caused by clamping the external carotid artery and subsequently clamping the common carotid artery were observed between the methods. The DE-fit method was more sensitive to μ a changes in cerebral tissues, whereas the MLB method was rather sensitive to μ a changes in the extracerebral tissues. Our results indicated that the DE-fit was useful for monitoring the cerebral blood circulation and oxygenation during neurosurgical operations. In addition, the combined evaluation of μ a changes with the DE-fit and MLB methods will provide us with more available information about the hemodynamic changes in the depth direction.

© 2007 Optical Society of America

OCIS Codes
(170.1610) Medical optics and biotechnology : Clinical applications
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics
(300.6500) Spectroscopy : Spectroscopy, time-resolved

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: October 31, 2006
Manuscript Accepted: December 22, 2006
Published: April 23, 2007

Virtual Issues
Vol. 2, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Chie Sato, Takekane Yamaguchi, Mitsuru Seida, Yoshihisa Ota, Iwae Yu, Yoshinobu Iguchi, Masahito Nemoto, and Yoko Hoshi, "Intraoperative monitoring of depth-dependent hemoglobin concentration changes during carotid endarterectomy by time-resolved spectroscopy," Appl. Opt. 46, 2785-2792 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-14-2785


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