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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 3 — Mar. 7, 2007

Tumor localization using diffuse optical tomography and linearly constrained minimum variance beamforming

Nannan Cao and Arye Nehorai  »View Author Affiliations


Optics Express, Vol. 15, Issue 3, pp. 896-909 (2007)
http://dx.doi.org/10.1364/OE.15.000896


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Abstract

We present a tumor localization method for diffuse optical tomography using linearly constrained minimum variance (LCMV) beam-forming. Beamforming is a spatial filtering technique where signals from certain directions can be enhanced while noise and interference from other directions are suppressed. In our method, we tessellate the domain into small voxels and regard each voxel as a possible position of abnormality (e.g., tumor). We then design a spatial filter based on the linearly constrained minimum variance criterion and apply it to each voxel in the domain. The abnormality is localized by observing the peak in the filter output signals. We test our method using simulated 3D examples. We assume a cubic transmission geometry and consider different cases where the abnormality is an absorber, a scatterer, and both. We also give examples showing the resolution of our method and its performance under different perturbation levels and noise levels. Simulation results show that LCMV beamforming can localize the abnormality well with good computational efficiency. It can be used alone for tumor localization and also as an effective preprocessing tool for improving the image reconstruction performances of other inverse methods.

© 2007 Optical Society of America

OCIS Codes
(100.3190) Image processing : Inverse problems
(170.3010) Medical optics and biotechnology : Image reconstruction techniques

ToC Category:
Image Processing

History
Original Manuscript: November 22, 2006
Revised Manuscript: January 15, 2007
Manuscript Accepted: January 16, 2007
Published: February 5, 2007

Virtual Issues
Vol. 2, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Nannan Cao and Arye Nehorai, "Tumor localization using diffuse optical tomography and linearly constrained minimum variance beamforming," Opt. Express 15, 896-909 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-15-3-896


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