Holographic otoscope using dual-shot-acquisition for the study of eardrum biomechanical displacements
| Autor: | Julio Cesar Estrada Rico, J. M. Flores-Moreno, Fernando Mendoza Santoyo |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Tympanic Membrane
Computer science Image quality Movement Holography Otoscopy Vibration law.invention Optics Otoscopes law Chinchilla Electronic speckle pattern interferometry Image Interpretation Computer-Assisted medicine Animals Otoscope Electrical and Electronic Engineering Engineering (miscellaneous) business.industry Equipment Design Holographic interferometry Atomic and Molecular Physics and Optics Equipment Failure Analysis medicine.anatomical_structure business Eardrum Digital holography Fresnel diffraction Algorithms |
| Zdroj: | Applied optics. 52(8) |
| ISSN: | 1539-4522 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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