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Applied Optics

Applied Optics


  • Vol. 44, Iss. 10 — Apr. 1, 2005
  • pp: 1905–1916

Time-resolved diffuse optical tomographic imaging for the provision of both anatomical and functional information about biological tissue

Huijuan Zhao, Feng Gao, Yukari Tanikawa, Kazuhiro Homma, and Yukio Yamada  »View Author Affiliations

Applied Optics, Vol. 44, Issue 10, pp. 1905-1916 (2005)

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We present in vivo images of near-infrared (NIR) diffuse optical tomography (DOT) of human lower legs and forearm to validate the dual functions of a time-resolved (TR) NIR DOT in clinical diagnosis, i.e., to provide anatomical and functional information simultaneously. The NIR DOT system is composed of time-correlated single-photon-counting channels, and the image reconstruction algorithm is based on the modified generalized pulsed spectral technique, which effectively incorporates the TR data with reasonable computation time. The reconstructed scattering images of both the lower legs and the forearm revealed their anatomies, in which the bones were clearly distinguished from the muscles. In the absorption images, some of the blood vessels were observable. In the functional imaging, a subject was requested to do handgripping exercise to stimulate physiological changes in the forearm tissue. The images of oxyhemoglobin, deoxyhemoglobin, and total hemoglobin concentration changes in the forearm were obtained from the differential images of the absorption at three wavelengths between the exercise and the rest states, which were reconstructed with a differential imaging scheme. These images showed increases in both blood volume and oxyhemoglobin concentration in the arteries and simultaneously showed hypoxia in the corresponding muscles. All the results have demonstrated the capability of TR NIR DOT by reconstruction of the absolute images of the scattering and the absorption with a high spatial resolution that finally provided both the anatomical and functional information inside bulky biological tissues.

© 2005 Optical Society of America

OCIS Codes
(170.3010) Medical optics and biotechnology : Image reconstruction techniques
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.6920) Medical optics and biotechnology : Time-resolved imaging
(170.6960) Medical optics and biotechnology : Tomography

Huijuan Zhao, Feng Gao, Yukari Tanikawa, Kazuhiro Homma, and Yukio Yamada, "Time-resolved diffuse optical tomographic imaging for the provision of both anatomical and functional information about biological tissue," Appl. Opt. 44, 1905-1916 (2005)

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