1. Hrebesh M. Subhash

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    1. Mentioned In 65 Articles

    2. A non‐invasive imaging and measurement using optical coherence tomography angiography for the assessment of gingiva: An in vivo study

      Explore Wiley Online Library Dentistry
      A non‐invasive imaging and measurement using optical coherence tomography angiography for the assessment of gingiva: An in vivo study
      Gingiva is the soft tissue that surrounds and protects the teeth. Healthy gingiva provides an effective barrier to periodontal insults to deeper tissue, thus is an important indicator to a patients periodontal health. Current methods in assessing gingival tissue health, including visual observation and physical examination with probing on the gingiva, are qualitative and subjective. They may become cumbersome when more complex cases are involved, such as variations in gingival ...
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      Mentions: Oregon Health & Science University University of Washington Ruikang K. Wang

    3. Feasibility of correlation mapping optical coherence tomography angiographic technique using a 200  kHz vertical-cavity surface-emitting laser source for in vivo microcirculation imaging applications

      Explore OSA | OSA Publishing
      Feasibility of correlation mapping optical coherence tomography angiographic technique using a 200  kHz vertical-cavity surface-emitting laser source for in vivo microcirculation imaging applications
      Optical coherence tomography (OCT) angiography is a well-established in vivo imaging technique to assess the overall vascular morphology of tissues and is an emerging field of research for the assessment of blood flow dynamics and functional parameters such as oxygen saturation. In this study, we present a modified scanning-based correlation mapping OCT using a 200 kHz high-speed swept-source OCT system operating at 1300 nm and demonstrate its wide field-imaging capability ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    4. Nano-sensitive fourier-domain optical coherence tomography inspection system

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      Nano-sensitive fourier-domain optical coherence tomography inspection system
      An OCT imaging system (100) comprising a radiation emitter (SLD), a radiation receiver CCD), an interferometer (FC, PC, X-Scan, Y-Scan), a controller (COMP) which controls the emitter and processes received radiation data according to OCT to provide an output image. The controller (COMP) forms a spectrum of spatial frequencies along the depth direction. It calculates from the spectrum local spectra of spatial frequencies or periods along the depth direction for ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    5. Feasibility study of phase-sensitive imaging based on multiple reference optical coherence tomography

      Explore OSA | OSA Publishing
      Feasibility study of phase-sensitive imaging based on multiple reference optical coherence tomography
      Multiple reference optical coherence tomography (MR-OCT) is a recently developed, low-cost and compact time-domain OCT solution for primary care and consumer level applications. A combination of a voice coil actuator and a partial mirror (PM) extends the scan range for imaging depths of approximately 1 mm in biological samples. Our previous research on MR-OCT is based only on intensity information obtained from the depth-resolved interference signal. In this Letter, we ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    6. Postdoctoral Research Scientist Position at Colgate-Palmolive Company in Piscataway New Jersey

      Explore Optical Coherence Tomography News Jobs & Studentships
      Postdoctoral Research Scientist Position at Colgate-Palmolive Company in Piscataway New Jersey
      Colgate-Palmolive is a leading global consumer products company, tightly focused on Oral Care, Personal Care, Home Care and Pet Nutrition. Colgate sells its products in over 200 countries and territories around the world under such internationally recognized brand names as Colgate, Palmolive, Speed Stick, Lady Speed Stick, Softsoap, Irish Spring, Protex, Sorriso, Kolynos, elmex, Toms of Maine, Sanex, Ajax, Axion, Fabuloso, Soupline and Suavitel, as well as Hills Science Diet ...
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      Mentions: Hrebesh M. Subhash

    7. Comparing an FFT filter for multiple reference optical coherence tomography (MR-OCT) with an Chebychev and an elliptic filter

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      Comparing an FFT filter for multiple reference optical coherence tomography (MR-OCT) with an Chebychev and an elliptic filter
      Portable and low-cost optical coherence tomography (OCT) is increasingly used to improve the accuracy of point-of-care applications. The increasing research efforts to use photonics integrated circuits (PIC) is without doubts the future for highest packaging densities in miniature optical systems. MR-OCT is another technology that is using the advantages of well known CD/DVD-ROM technology to build miniaturized and low-cost OCT systems and may be more readily available before PICs ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    8. The how and why of a $10 optical coherence tomography system

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      The how and why of a $10 optical coherence tomography system
      Optical Coherence Tomography (OCT) is the fastest growing medical imaging modality with more than $1Bln worth of scans ordered and over $400M worth of equipment shipped in 2010, just nine years after its commercialization. It is at various stages of acceptance and approvals for eye care, coronary care and skin cancer care and is spreading rapidly to other medical specialties. Indeed, it is the leading success of translation of biophotonics ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    9. Quantitative assessment of rat corneal thickness and morphology during stem cell therapy by high-speed optical coherence tomography

      Explore Conference Proceedings Ophthalmology
      Quantitative assessment of rat corneal thickness and morphology during stem cell therapy by high-speed optical coherence tomography
      Optical Coherence Tomography (OCT) is a non-invasive 3 dimensional optical imaging modality that enables high resolution cross sectional imaging in biological tissues and materials. Its high axial and lateral resolution combined with high sensitivity, imaging depth and wide field of view makes it suitable for wide variety of high resolution medical imaging applications at clinically relevant speed. With the advent of swept source lasers, the imaging speed of OCT has ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    10. Optimization of modified scanning protocol based correlation mapping optical coherence tomography at 200 kHz VCSEL source for in vivo microcirculation imaging applications

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      Optimization of modified scanning protocol based correlation mapping optical coherence tomography at 200 kHz VCSEL source for in vivo microcirculation imaging applications
      Optical Coherence Tomography (OCT) is a non-invasive 3 dimensional optical imaging modality that enables high resolution cross sectional imaging in biological tissues and materials. Unlike other 3 D medical imaging modalities, OCT provides high axial and lateral resolution combined with high sensitivity, imaging depth and wide field of view which makes it suitable for wide variety of medical imaging applications1. Apart from analysing the morphological characteristics of the biological organs ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    11. The impact of relative intensity noise on the signal in multiple reference optical coherence tomography

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      The impact of relative intensity noise on the signal in multiple reference optical coherence tomography
      Multiple reference optical coherence tomography (MR-OCT) applies a unique low-cost solution to enhance the scanning depth of standard time domain OCT by inserting an partial mirror into the reference arm of the interferometric system. This novel approach achieves multiple reflections for different layers and depths of an sample with minimal effort of engineering and provides an excellent platform for low-cost OCT systems based on well understood production methods for micro-mechanical ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    12. Depth-dependent displacement sensitivity analysis and the influence of Doppler angle for quantitative assessment of mechanical properties using phase-sensitive spectral domain optical coherence tomography

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      Depth-dependent displacement sensitivity analysis and the influence of Doppler angle for quantitative assessment of mechanical properties using phase-sensitive spectral domain optical coherence tomography
      Optical coherence elastography (OCE) asesses the mechanical properties of samples by applying a mechanical stimulation and detecting the resulting sample displacement using optical coherence tomography (OCT). OCE methods which utilise the phase of the OCT signal offer the potential to detect displacements on the sub-nanometre scale. However, the displacement sensitivity achieveable is directly related to the signal-to-noise ratio and phase stability of the underlying OCT system. Furthermore, the estimation of ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    13. Catoptric Objective Based HighSensitive Fourier-Domain Optical Coherence Tomography

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      Catoptric Objective Based HighSensitive Fourier-Domain Optical Coherence Tomography
      We introduce a novel catoptric objective based high sensitive Fourier Domain Optical Coherence Tomography (FD-OCT) system for enhanced structural and functional imaging of cochlear microstructures. Unlike the conventional refractive type microscopic objective, catoptric objectives are well-known for their chromatic aberrations free operation and high light gathering efficiency for a broad range of wavelengths. In this study, we present the feasibility of a commercially available catoptric type objective to obtain high-sensitivity ...
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      Mentions: Hrebesh M. Subhash

    14. Assessment of curing behavior of light-activated dental composites using intensity correlation based multiple reference optical coherence tomography

      Explore Wiley Online Library Dentistry
      Assessment of curing behavior of light-activated dental composites using intensity correlation based multiple reference optical coherence tomography
      Background and Objectives Monitoring the curing kinetics of light-activated resin is a key area of research. These resins are used in restorative applications and particularly in dental applications. They can undergo volumetric shrinkage due to poor control of the depth dependent curing process, modulated by the intensity and duration of the curing light source. This often results in the formation of marginal gaps, causing pain and damage to the restoration ...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway

    15. 3D nondestructive testing system with an affordable multiple reference optical-delay-based optical coherence tomography

      Explore OSA | OSA Publishing NDE/NDT
      3D nondestructive testing system with an affordable multiple reference optical-delay-based optical coherence tomography
      ...ve., Suite 5B, Mountain View, California 94043, USA *Corresponding author: hrebeshms@gmail.com Roshan Dsouza, Hrebesh M. Subhash, Kai Neuhaus, Josh Hogan, Carol Wilson, and Martin Leahy, "3D nondestructive testing system...
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      Mentions: Hrebesh M. Subhash Martin J. Leahy National University of Ireland, Galway
    17. 1-15 of 65 1 2 3 4 5 »
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  4. About Hrebesh M. Subhash

    Hrebesh M. Subhash

    Hrebesh Molly Subhash is with the Biophotonics & Imaging Lab in the School of Medicine at the Oregon Health & Science University. Hrebesh is currently a research associate in Biophotonics and Imaging Laboratory (BAIL), School of Medicine, OHSU Hospital at Portland, OR USA. He works with Prof. R. K. Wang, who is the director of BAIL. His current research activity involves the development of novel optical coherence domain imaging techniques for both anatomical and functional imaging.

    He received his Ph.D. degree in Human Sensing and Functional Sensor Engineering in 2008 from Yamagata University, Yonezawa, Japan. He earned his bachelor's degree in Applied Electronics from the University of Kerala in 1998; his master's in Applied Electronics from the University of Bharathiar in 2000; and his M. Phil in Photonics from the International School of Photonics at the Cochin University of Science and Technology in 2004.

    He was a member of Dr. P.K . Gupta's Biomedical Application Section of RRCAT , Indore. I worked with the Optical Imaging Laboratory led by Dr. Divaker Rao and played a key role in developing the first indigenous Optical Coherence Tomography setup in India.

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    1. In vivo microcirculation imaging of the sub surface fingertip using correlation mapping optical coherence tomography (cmOCT)
      34 articles also mentioned Martin J. Leahy
    2. High-speed full-range spectral-domain correlation mapping optical coherence tomography
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    3. Ultra-high speed full range complex spectral domain optical coherence tomography for volumetric imaging at 140,000 A scans per second
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    5. Volumetric In Vivo Imaging of Microvascular Perfusion Within the Intact Cochlea in Mice Using Ultra-High Sensitive Optical Microangiography
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