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### Proceedings Paper

Distortion corrected imaging using projected index computed tomography
Author(s): Adam M. Zysk; James Joshua Reynolds; Daniel L. Marks; P. Scott Carney; Stephen A. Boppart
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Paper Abstract

Projected index computed tomography (PICT) is a newly developed technique that uses the measured optical path length from multiple optical coherence tomography (OCT) scans through a semitransparent sample to computationally reconstruct tomographic images based on the spatial variations of the refractive index. Since the index of refraction of most samples is not constant, a depth-wise distortion due to the varying index of the sample is evident. Using a highly reflective reference surface placed behind the sample, optical path length measurements yield an aggregate index value for each beampath through the sample. Rotating the sample allows a data set to be formed for multiple beam angles. These data can be understood as the projections of the object index, i.e. the Radon tranform of the index of the object. Using filtered backprojection algorithms set of projection data were used to reconstruct PICT images. The resulting images are free from the spatial distortions found in standard OCT. Experimental results show that PICT images correspond well with the dimensional characteristics of specific samples.

Paper Details

Date Published: 8 July 2003
PDF: 6 pages
Proc. SPIE 4956, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII, (8 July 2003); doi: 10.1117/12.479031
Show Author Affiliations
Adam M. Zysk, Beckman Institute for Advanced Science and Technology (United States)
Univ. of Illinois/Urbana-Champaign (United States)
James Joshua Reynolds, Beckman Institute for Advanced Science and Technology (United States)
Univ. of Illinois/Urbana-Champaign (United States)
Daniel L. Marks, Beckman Institute for Advanced Science and Technology (United States)
Univ. of Illinois/Urbana-Champaign (United States)
P. Scott Carney, Beckman Institute for Advanced Science and Technology (United States)
Univ. of Illinois/Urbana-Champaign (United States)
Stephen A. Boppart, Beckman Institute for Advanced Science and Technology (United States)
Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 4956:
Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)