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Proceedings Paper

Wavelet-based multifractal analysis of laser biopsy imagery
Author(s): Jaidip Jagtap; Sayantan Ghosh; Prasanta K. Panigrahi; Asima Pradhan
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Paper Abstract

In this work, we report a wavelet based multi-fractal study of images of dysplastic and neoplastic HE- stained human cervical tissues captured in the transmission mode when illuminated by a laser light (He-Ne 632.8nm laser). It is well known that the morphological changes occurring during the progression of diseases like cancer manifest in their optical properties which can be probed for differentiating the various stages of cancer. Here, we use the multi-resolution properties of the wavelet transform to analyze the optical changes. For this, we have used a novel laser imagery technique which provides us with a composite image of the absorption by the different cellular organelles. As the disease progresses, due to the growth of new cells, the ratio of the organelle to cellular volume changes manifesting in the laser imagery of such tissues. In order to develop a metric that can quantify the changes in such systems, we make use of the wavelet-based fluctuation analysis. The changing self- similarity during disease progression can be well characterized by the Hurst exponent and the scaling exponent. Due to the use of the Daubechies' family of wavelet kernels, we can extract polynomial trends of different orders, which help us characterize the underlying processes effectively. In this study, we observe that the Hurst exponent decreases as the cancer progresses. This measure could be relatively used to differentiate between different stages of cancer which could lead to the development of a novel non-invasive method for cancer detection and characterization.

Paper Details

Date Published: 22 February 2012
PDF: 9 pages
Proc. SPIE 8222, Dynamics and Fluctuations in Biomedical Photonics IX, 82220F (22 February 2012); doi: 10.1117/12.907330
Show Author Affiliations
Jaidip Jagtap, Indian Institute of Technology Kanpur (India)
Sayantan Ghosh, Univ. of KwaZulu-Natal (South Africa)
Prasanta K. Panigrahi, Indian Institute of Science Education and Research Kolkata (India)
Asima Pradhan, Indian Institute of Technology Kanpur (India)

Published in SPIE Proceedings Vol. 8222:
Dynamics and Fluctuations in Biomedical Photonics IX
Valery V. Tuchin; Donald D. Duncan; Kirill V. Larin; Martin J. Leahy; Ruikang K. Wang, Editor(s)

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