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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 3, Iss. 9 — Sep. 1, 2012
  • pp: 2021–2035

Quantifying collagen structure in breast biopsies using second-harmonic generation imaging

Raghu Ambekar, Tung-Yuen Lau, Michael Walsh, Rohit Bhargava, and Kimani C. Toussaint, Jr.  »View Author Affiliations

Biomedical Optics Express, Vol. 3, Issue 9, pp. 2021-2035 (2012)

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Quantitative second-harmonic generation imaging is employed to assess stromal collagen in normal, hyperplastic, dysplastic, and malignant breast tissues. The cellular scale organization is quantified using Fourier transform-second harmonic generation imaging (FT-SHG), while the molecular scale organization is quantified using polarization-resolved second-harmonic generation measurements (P-SHG). In the case of FT-SHG, we apply a parameter that quantifies the regularity in collagen fiber orientation and find that malignant tissue contains locally aligned fibers compared to other tissue conditions. Alternatively, using P-SHG we calculate the ratio of tensor elements (d15/d31, d22/d31, and d33/d31) of the second-order susceptibility χ2 for collagen fibers in breast biopsies. In particular, d15/d31 shows potential differences across the tissue pathology. We also find that trigonal symmetry (3m) is a more appropriate model to describe collagen fibers in malignant tissues as opposed to the conventionally used hexagonal symmetry (C6). This novel method of targeting collagen fibers using a combination of two quantitative SHG techniques, FT-SHG and P-SHG, holds promise for breast tissue analysis and applications to characterizing cancer in a manner that is compatible with clinical practice.

© 2012 OSA

OCIS Codes
(100.2960) Image processing : Image analysis
(180.4315) Microscopy : Nonlinear microscopy

ToC Category:

Original Manuscript: May 21, 2012
Revised Manuscript: July 19, 2012
Manuscript Accepted: August 4, 2012
Published: August 7, 2012

Raghu Ambekar, Tung-Yuen Lau, Michael Walsh, Rohit Bhargava, and Kimani C. Toussaint, "Quantifying collagen structure in breast biopsies using second-harmonic generation imaging," Biomed. Opt. Express 3, 2021-2035 (2012)

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