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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 19 — Jul. 1, 2000
  • pp: 3380–3387

Multiple-Slice Imaging of a Tissue-Equivalent Phantom by Use of Time-Resolved Optical Tomography

Florian E. W. Schmidt, Jeremy C. Hebden, Elizabeth M. C. Hillman, Martin E. Fry, Martin Schweiger, Hamid Dehghani, David T. Delpy, and Simon R. Arridge  »View Author Affiliations


Applied Optics, Vol. 39, Issue 19, pp. 3380-3387 (2000)
http://dx.doi.org/10.1364/AO.39.003380


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Abstract

Following several years of development the construction of a multichannel time-resolved imaging device for medical optical tomography has been completed. Images are reconstructed from time-resolved measurements by use of a scheme that employs a finite-element diffusion-based forward model and an iterative reconstruction solver. Prior to testing on clinical subjects the fully automated instrument and the reconstruction software are evaluated with tissue-equivalent phantoms. We describe our first attempt to generate multiple-slice images of a phantom without uniform properties along the axial direction, while still using a computationally fast two-dimensional reconstruction algorithm. The image quality is improved by the employment of an approximate correction method that uses scaling factors derived from the ratios of finite-element forward simulations in two and three spatial dimensions. The 32-channel system was employed to generate maps of the internal scattering and the absorption properties at 14 different transverse planes across the phantom. The images clearly reveal the locations of small inhomogeneous regions embedded within the phantom. These results were obtained by use of purely temporal data and without resource to reference measurements.

© 2000 Optical Society of America

OCIS Codes
(170.0110) Medical optics and biotechnology : Imaging systems
(170.3010) Medical optics and biotechnology : Image reconstruction techniques
(170.6920) Medical optics and biotechnology : Time-resolved imaging
(170.6960) Medical optics and biotechnology : Tomography

Citation
Florian E. W. Schmidt, Jeremy C. Hebden, Elizabeth M. C. Hillman, Martin E. Fry, Martin Schweiger, Hamid Dehghani, David T. Delpy, and Simon R. Arridge, "Multiple-Slice Imaging of a Tissue-Equivalent Phantom by Use of Time-Resolved Optical Tomography," Appl. Opt. 39, 3380-3387 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-19-3380


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