Cellular structure of the healthy and keratoconic human cornea imaged in-vivo with sub-micrometer axial resolution OCT (Conference Presentation)

2017 ◽  
Author(s):  
Kostadinka Bizheva ◽  
Bingyao Tan ◽  
Erik Mason ◽  
Kirsten Carter ◽  
Lacey Haines ◽  
...  
Keyword(s):  
Cellular Structure ◽  
Human Cornea ◽  
Axial Resolution

In-vivo volumetric imaging of the cellular structure of healthy and pathological human cornea with high-speed UHR-OCT (Conference Presentation)

2018 ◽  
Author(s):  
Zohreh Hosseinaee ◽  
Bingyao Tan ◽  
Kirsten Carter ◽  
Denise Hileeto ◽  
Luigina Sorbara ◽  
...  
Keyword(s):  
Cellular Structure ◽  
High Speed ◽  
Human Cornea ◽  
Volumetric Imaging

scholarly journals Sub-micrometer axial resolution OCT for in-vivo imaging of the cellular structure of healthy and keratoconic human corneas

2017 ◽  
Vol 8 (2) ◽  
pp. 800 ◽  
Author(s):  
Kostadinka Bizheva ◽  
Bingyao Tan ◽  
Benjamin MacLelan ◽  
Olivera Kralj ◽  
Mojtaba Hajialamdari ◽  
...  
Keyword(s):  
In Vivo Imaging ◽  
Cellular Structure ◽  
Axial Resolution

scholarly journals An Accurate Method to Determine Bowman's Layer Thickness In Vivo in the Human Cornea

2012 ◽  
Vol 53 (4) ◽  
pp. 2354 ◽  
Author(s):  
Johan Germundsson ◽  
Per Fagerholm ◽  
Marina Koulikovska ◽  
Neil S. Lagali
Keyword(s):  
Layer Thickness ◽  
Accurate Method ◽  
Human Cornea

scholarly journals Optical System Design for Noncontact, Normal Incidence, THz Imaging of in vivo Human Cornea

2018 ◽  
Vol 8 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Shijun Sung ◽  
Alex Li ◽  
Sophie X. Deng ◽  
Elliott Brown ◽  
Warren S. Grundfest ◽  
...  
Keyword(s):  
System Design ◽  
Optical System ◽  
Normal Incidence ◽  
Human Cornea ◽  
Thz Imaging ◽  
Optical System Design

Comparison of in vivo and ex vivo cellular structure in rabbit eyes detected by tandem scanning microscopy

1992 ◽  
Vol 165 (1) ◽  
pp. 169-181 ◽  
Author(s):  
James V. Jester ◽  
W. Matthew Petroll ◽  
Randa M. R. Garana ◽  
Michael A. Lemp ◽  
H. Dwight Cavanagh
Keyword(s):  
Cellular Structure ◽  
Ex Vivo ◽  
Scanning Microscopy

Deconvolution of in-Vivo Ultrasound B-Mode Images

1993 ◽  
Vol 15 (2) ◽  
pp. 122-133 ◽  
Author(s):  
Jørgen Arendt Jensen ◽  
Jan Mathorne ◽  
Torben Gravesen ◽  
Bjarne Stage
Keyword(s):  
Portal Vein ◽  
Ultrasound Images ◽  
Medical Ultrasound ◽  
Axial Resolution ◽  
One Dimensional ◽  
Rf Signal ◽  
Ultrasound Pulse

An algorithm for deconvolution of medical ultrasound images is presented. The procedure involves estimation of the basic one-dimensional ultrasound pulse, determining the ratio of the covariance of the noise to the covariance of the reflection signal, and finally deconvolution of the rf signal from the transducer. Using pulse and covariance estimators makes the approach self-calibrating, as all parameters for the procedure are estimated from the patient under investigation. An example of use on a clinical, in-vivo image is given. A 2 × 2 cm region of the portal vein in a liver is deconvolved. An increase in axial resolution by a factor of 2.4 is obtained. The procedure can also be applied to whole images, when it is ensured that the rf signal is properly measured. A method for doing that is outlined.

scholarly journals A new methodology for the in vivo estimation of the elastic constants that characterize the patient-specific biomechanical behavior of the human cornea

2015 ◽  
Vol 48 (1) ◽  
pp. 38-43 ◽  
Author(s):  
M.A. Lago ◽  
M.J. Rupérez ◽  
F. Martínez-Martínez ◽  
C. Monserrat ◽  
E. Larra ◽  
...  
Keyword(s):  
Elastic Constants ◽  
Patient Specific ◽  
Human Cornea ◽  
Biomechanical Behavior

Ultraviolet Photography of the In Vivo Human Cornea Unmasks the Hudson-Stähli Line and Physiologic Vortex Patterns

2005 ◽  
Vol 46 (10) ◽  
pp. 3616 ◽  
Author(s):  
Sean G. Every ◽  
John P. Leader ◽  
Anthony C. B. Molteno ◽  
Tui H. Bevin ◽  
Gordon Sanderson
Keyword(s):  
Human Cornea ◽  
Vortex Patterns ◽  
Ultraviolet Photography

Application of Acoustoelasticity: Identifying Tendon Damage

2008 ◽  
Author(s):  
Catherine E. Frisch ◽  
Hirohito Kobayashi ◽  
Ray Vanderby
Keyword(s):  
Cellular Structure ◽  
Repeated Loading ◽  
Ultrasound Wave ◽  
Strain Gages ◽  
Tissue Stiffness ◽  
Irreversible Damage ◽  
Tissue Strain ◽  
Damage Indicators ◽  
Functional Loading

Damage to connective tissue such as tendons can occur via stretch injuries. During stretch injury, a tendon experiences permanent subfailure damage. Provenzano et al. showed that irreversible damage to the cellular structure of tendon or ligament occurs before noticeable changes can be measured in the mechanical behavior of the tissue [1]. The same paper also showed that during loading a portion of the curve can be classified as a sub-damage region where repeated loading in that range will have no effect on mechanical properties. There is also a damage region where plastic deformation and fiber tearing occurs. In this region, the severity of damage increases as the amount of strain increases. For the same level of functional loading after damage, tissue stiffness decreases while tissue strain increases. In-vivo measurements of damage indicators, such as strain and stiffness of a tendon, prove difficult using current techniques, since many of those methods are invasive (implanted strain gages) or large and non-portable (MRI)[2]. Recent studies have shown that ultrasound can be employed to assess ligaments and tendons by measuring ultrasound wave velocity and echo reflection [3,4].

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