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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 4 — May. 22, 2013

Holographic otoscope using dual-shot-acquisition for the study of eardrum biomechanical displacements

Jorge Mauricio Flores-Moreno, Fernando Mendoza Santoyo, and Julio Cesar Estrada Rico  »View Author Affiliations

Applied Optics, Vol. 52, Issue 8, pp. 1731-1742 (2013)

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Recently an optoelectronic holography system was deployed in the clinic with the purpose of quantifying the tympanic membrane (TM) displacements of various mammal species, the objective being the understanding of their middle ear biomechanics. The optoelectronic holography system has an in-line configuration where the data gathered is decoded using lensless digital holography with the Fresnel approximation. This paper presents quantitative data obtained from an acoustically excited postmortem chinchilla’s TM. To achieve this we used a robust customized windowed unwrapping method to unwrap the noisy optical phase obtained by subtracting phase maps of two recorded holograms and the results were compared with those obtained when using the unwrapping branch-cut algorithm. Additionally, phase maps obtained by the phase-stepping technique were compared applying both unwrapping methods. For in vivo applications particular emphasis is made on post-processing dual-shot-acquisition of holograms as one of various acquisition strategies and algorithms to diminish measurement error due to heartbeat, breathing, and patient’s head motion as well as environment induced mechanical disturbances present in a noncontrolled environment, such as in a clinic. By recording only two holograms representing a stationary and deformed state of eardrum, respectively, we can increase the acquisition speed of the camera used to record faster events happening on the TM surface.

© 2013 Optical Society of America

OCIS Codes
(090.1995) Holography : Digital holography
(100.5088) Image processing : Phase unwrapping

ToC Category:
Image Processing

Original Manuscript: November 20, 2012
Revised Manuscript: February 6, 2013
Manuscript Accepted: February 7, 2013
Published: March 8, 2013

Virtual Issues
Vol. 8, Iss. 4 Virtual Journal for Biomedical Optics

Jorge Mauricio Flores-Moreno, Fernando Mendoza Santoyo, and Julio Cesar Estrada Rico, "Holographic otoscope using dual-shot-acquisition for the study of eardrum biomechanical displacements," Appl. Opt. 52, 1731-1742 (2013)

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