1. Hrebesh M. Subhash

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    1. Mentioned In 71 Articles

    2. Semi-automated registration and segmentation for gingival tissue volume measurement on 3D OCT images

      Semi-automated registration and segmentation for gingival tissue volume measurement on 3D OCT images
      The change in gingival tissue volume may be used to indicate changes in gingival inflammation, which may be useful for the clinical assessment of gingival health. Properly quantifying gingival tissue volume requires a robust technique for accurate registration and segmentation of longitudinally captured 3-dimensional (3D) images. In this paper, a semi-automated registration and segmentation method for micrometer resolution measurement of gingival-tissue volume is proposed for 3D optical coherence tomography (OCT ...
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    3. Split-spectrum amplitude-decorrelation angiography with optical coherence tomography

      Split-spectrum amplitude-decorrelation angiography with optical coherence tomography
      Amplitude decorrelation measurement is sensitive to transverse flow and immune to phase noise in comparison to Doppler and other phase-based approaches. However, the high axial resolution of OCT makes it very sensitive to the pulsatile bulk motion noise in the axial direction. To overcome this limitation, we developed split-spectrum amplitude-decorrelation angiography (SSADA) to improve the signal-to-noise ratio (SNR) of flow detection. The full OCT spectrum was split into several narrower ...
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    4. Non‐invasive multimodal imaging by integrating optical coherence tomography with autofluorescence imaging for dental applications

      Non‐invasive multimodal imaging by integrating optical coherence tomography with autofluorescence imaging for dental applications
      We report the development of an integrated multi‐functional imaging system capable of providing anatomical (optical coherence tomography, OCT), functional (OCT angiography, OCTA) and molecular imaging (light‐induced autofluorescence, LIAF) for in vivo dental applications. Blue excitation light (405nm) was used for LIAF imaging, while the OCT was powered by a 1310nm swept laser source. A red‐green‐blue (RGB) digital camera, with a 450nm cut‐on broad‐band optical ...
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    5. An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues

      An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues
      Optical coherence tomography (OCT) is a noninvasive, high-resolution, cross-sectional imaging technique. To date, OCT has been demonstrated in several areas of dentistry, primarily using wavelengths around 1,300 nm, low numerical aperture (NA) imaging lenses, and detectors insensitive to the polarization of light. The objective of this study is to compare the performance of three commercially available OCT systems operating with alternative wavelengths, imaging lenses, and detectors for OCT imaging ...
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    6. An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues

      An Experimental Review of Optical Coherence Tomography Systems for Noninvasive Assessment of Hard Dental Tissues
      Optical coherence tomography (OCT) is a noninvasive, high-resolution, cross-sectional imaging technique. To date, OCT has been demonstrated in several areas of dentistry, primarily using wavelengths around 1,300 nm, low numerical aperture (NA) imaging lenses, and detectors insensitive to the polarization of light. The objective of this study is to compare the performance of three commercially available OCT systems operating with alternative wavelengths, imaging lenses, and detectors for OCT imaging ...
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    7. Postdoctoral Research Scientist Opening at Colgate-Palmolive

      Postdoctoral Research Scientist Opening at Colgate-Palmolive
      Colgate-Palmolive Global Technology Center located in Piscataway, NJ, USA, seeks highly motivated postdoctoral research scientist with excellent background in research and development of cutting-edge medical diagnostic devices and sensor technologies for next generation oral and personal care applications. Candidates with strong background in optical imaging/sensor and mechatronics systems for biomedical applications are preferred. Applicants will work closely with various external collaborators and will spend a significant amount of time ...
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    8. A non‐invasive imaging and measurement using optical coherence tomography angiography for the assessment of gingiva: An in vivo study

      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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    9. 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

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

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

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

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

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

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

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

      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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    17. 1-15 of 71 1 2 3 4 5 »
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  2. 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.