scholarly journals In Vivo Vibration Measurement of Middle Ear Structure Using Doppler Optical Coherence Tomography: Preliminary Study

2019 ◽  
Vol 12 (1) ◽  
pp. 40-49 ◽  
Author(s):  
Doekmin Jeon ◽  
Nam Hyun Cho ◽  
Kibeom Park ◽  
Kanghae Kim ◽  
Mansik Jeon ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Middle Ear ◽  
Vibration Measurement ◽  
Optical Coherence ◽  
Preliminary Study ◽  
Doppler Optical Coherence Tomography

scholarly journals Measurement of Vibrating Tympanic Membrane in an In Vivo Mouse Model Using Doppler Optical Coherence Tomography

2019 ◽  
Vol 5 (9) ◽  
pp. 74
Author(s):  
Jeon ◽  
Kim ◽  
Jeon ◽  
Kim
Keyword(s):  
Optical Coherence Tomography ◽  
Phase Shift ◽  
Tympanic Membrane ◽  
Middle Ear ◽  
Acoustic Stimulus ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Vibratory Motion ◽  
Doppler Optical Coherence Tomography

Optical coherence tomography (OCT) has a micro-resolution with a penetration depth of about 2 mm and field of view of about 10 mm. This makes OCT well suited for analyzing the anatomical and internal structural assessment of the middle ear. To study the vibratory motion of the tympanic membrane (TM) and its internal structure, we developed a phase-resolved Doppler OCT system using Kasai’s autocorrelation algorithm. Doppler optical coherence tomography is a powerful imaging tool which can offer the micro-vibratory measurement of the tympanic membrane and obtain the micrometer-resolved cross-sectional images of the sample in real-time. To observe the relative vibratory motion of individual sections (malleus, thick regions, and the thin regions of the tympanic membrane) of the tympanic membrane in respect to auditory signals, we designed an experimental study for measuring the difference in Doppler phase shift for frequencies varying from 1 to 8 kHz which were given as external stimuli to the middle ear of a small animal model. Malleus is the very first interconnecting region between the TM and cochlea. In our proposed study, we observed that the maximum change in Doppler phase shift was seen for the 4 kHz acoustic stimulus in the malleus, the thick regions, and in the thin regions of the tympanic membrane. In particular, the vibration signals were higher in the malleus in comparison to the tympanic membrane.

Optical coherence tomography of the oval window niche

2009 ◽  
Vol 123 (6) ◽  
pp. 603-608 ◽  
Author(s):  
T Just ◽  
E Lankenau ◽  
G Hüttmann ◽  
H W Pau
Keyword(s):  
Optical Coherence Tomography ◽  
Middle Ear ◽  
Imaging Modality ◽  
Oval Window ◽  
Annular Ligament ◽  
Middle Ear Surgery ◽  
Optical Coherence ◽  
Ear Surgery ◽  
Temporal Bones

AbstractObjective:Optical coherence tomography was used to study the stapes footplate, both in cadaveric temporal bones and during middle-ear surgery.Materials and methods:Optical coherence tomography was conducted on five temporal bone preparations (from two children and three adults) and in eight patients during middle-ear surgery. A specially equipped operating microscope with integrated spectral domain optical coherence tomography apparatus was used for standard middle-ear surgical procedures.Results:This optical coherence tomography investigation enabled in vivo visualisation and documentation of the annular ligament, the different layers of the footplate and the inner-ear structures, both in non-fixed and fixed stapes footplates. In cases of otosclerosis and tympanosclerosis, an inhomogeneous and irregularly thickened footplate was found, in contrast to the appearance of non-fixed footplates. In both fixed and non-fixed footplates, there was a lack of visualisation of the border between the footplate and the otic capsule.Conclusions:Investigation of the relatively new technology of optical coherence tomography indicated that this imaging modality may assist the ear surgeon to assess the oval window niche intra-operatively.

In vivo feasibility of endoscopic catheter-based Doppler optical coherence tomography

2003 ◽  
Vol 124 (4) ◽  
pp. A49-A50 ◽  
Author(s):  
Victor X.D. Yang ◽  
Bing Qi ◽  
Maggie L. Gordon ◽  
Emily Seng Yue ◽  
Stuart Bisland ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence ◽  
Doppler Optical Coherence Tomography

scholarly journals In vivo label-free measurement of lymph flow velocity and volumetric flow rates using Doppler optical coherence tomography

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Cedric Blatter ◽  
Eelco F. J. Meijer ◽  
Ahhyun S. Nam ◽  
Dennis Jones ◽  
Brett E. Bouma ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Flow Velocity ◽  
Lymph Flow ◽  
Optical Coherence ◽  
Label Free ◽  
Flow Rates ◽  
Doppler Optical Coherence Tomography
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