Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Speckle Reduction Process Based on Digital Filtering and Wavelet Compounding in Optical Coherence Tomography for Dermatology
Year:2015
Research Areas
  • Engineering,
  • Electronic technology and of the communications
Information
Abstract
Optical Coherence Tomography (OCT) has shown a great potential as a complementary imaging tool in the diagnosis of skin diseases. Speckle noise is the most prominent artifact present in OCT images and could limit the interpretation and detection capabilities. In this work we propose a new speckle reduction process and compare it with various denoising filters with high edge-preserving potential, using several sets of dermatological OCT B-scans. To validate the performance we used a custom-designed spectral domain OCT and two different data set groups. The first group consisted in five datasets of a single B-scan captured N times (with N<20), the second were five 3D volumes of 25 Bscans. As quality metrics we used signal to noise (SNR), contrast to noise (CNR) and equivalent number of looks (ENL) ratios. Our results show that a process based on a combination of a 2D enhanced sigma digital filter and a wavelet compounding method achieves the best results in terms of the improvement of the quality metrics. In the first group of individual B-scans we achieved improvements in SNR, CNR and ENL of 16.87 dB, 2.19 and 328 respectively; for the 3D volume datasets the improvements were 15.65 dB, 3.44 and 1148. Our results suggest that the proposed enhancement process may significantly reduce speckle, increasing SNR, CNR and ENL and reducing the number of extra acquisitions of the same frame.
International
Si
Congress
European Conference on Biomedical Optics SPIE-OSA 2015
960
Place
Munich (Alemania)
Reviewers
Si
ISBN/ISSN
1605-7422
10.1117/12.2183815
Start Date
21/06/2015
End Date
25/06/2015
From page
95411
To page
95411
Optical Coherence Imaging Techniques and Imaging in Scattering Media, edited by Brett E. Bouma, Maciej Wojtkowski, Proceedings of SPIE-OSA Biomedical Optics Vol. 9541
Participants
  • Autor: Juan Jose Gomez Valverde (UPM)
  • Autor: Juan Enrique Ortuño Fisac (UPM)
  • Autor: Pedro Guerra Gutierrez (UPM)
  • Autor: Andres de Santos Lleo (UPM)
  • Autor: Maria Jesus Ledesma Carbayo (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Tecnología de imágenes biomédicas
  • Centro o Instituto I+D+i: Centro de tecnología Biomédica CTB
  • Departamento: Ingeniería Electrónica
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