1. Articles mentioning both Ryerson University and Victor X. D. Yang

    1-24 of 76 1 2 3 4 »
    1. Optical coherence tomography for dynamic axial correction of an optical end-effector for robot-guided surgical laser ablation

      Optical coherence tomography for dynamic axial correction of an optical end-effector for robot-guided surgical laser ablation
      Robot-guided laser ablation for surgical applications potentially offers many advantages compared to by-hand mechanical tissue cutting. However, given that tissue can be rough and/or uneven, ablation quality can be compromised if the beam waist deviates significantly from the target tissue surface. Therefore, we present a method that uses optical coherence tomography (OCT) for dynamic refocusing of robot-guided surgical laser ablation. A 7-DOF robotic manipulator with an OCT-equipped optical payload ...
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    2. 2D MEMS-based high-speed beam-shifting technique for speckle noise reduction and flow rate measurement in optical coherence tomography

      2D MEMS-based high-speed beam-shifting technique for speckle noise reduction and flow rate measurement in optical coherence tomography
      In this manuscript, a two-dimensional (2D) micro-electro-mechanical system (MEMS)-based, high-speed beam-shifting spectral domain optical coherence tomography (MHB-SDOCT) is proposed for speckle noise reduction and absolute flow rate measurement. By combining a zigzag scanning protocol, the frame rates of 45.2 Hz for speckle reduction and 25.6 Hz for flow rate measurement are achieved for in-vivo tissue imaging. Phantom experimental results have shown that by setting the incident beam ...
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    3. Beam-shifting technique for speckle reduction and flow rate measurement in optical coherence tomography

      Beam-shifting technique for speckle reduction and flow rate measurement in optical coherence tomography
      In this Letter, we propose a beam-shifting optical coherence tomography scheme for speckle reduction and blood flow rate calculation, where variations of the speckle pattern and Doppler angle were generated by parallel shifting of the sample beam incident on the objective lens. The resultant optical coherent tomography images could then be averaged for speckle noise reduction and simultaneously analyzed for flow rate measurement. The performance of the proposed technique was ...
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    4. Buffer-averaging super-continuum source based spectral domain optical coherence tomography for high speed imaging

      Buffer-averaging super-continuum source based spectral domain optical coherence tomography for high speed imaging
      In super-continuum (SC) source based spectral domain optical coherence tomography (SC-SDOCT), the stability of the power spectral density (PSD) has a significant impact on OCT system sensitivity and image signal to noise ratio (SNR). High speed imaging decreases the camera's exposure time, thus each A-scan contained fewer laser pulse excited SC wideband emissions, resulting in a decrease of SNR. In this manuscript, we present a buffer-averaging SC-SDOCT (BASC-SDOCT) to ...
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    5. Carotid artery stenting with optical coherence tomography

      Carotid artery stenting with optical coherence tomography
      A 61-year-old man underwent a left cervical internal carotid artery stenting following a recent ischemic stroke. Postoperative angiography was satisfactory and did not reveal any in-stent filling defect ( figure 1A ). Optical coherence tomography (OCT) probe was used to visualize the endoluminal area following stenting. OCT confirmed optimum placement of the stent and reveled a small plaque protrusion from the stent struts following deployment ( figure 1B ).
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    6. Gabor optical coherence tomographic angiography (GOCTA) (Part I): human retinal imaging in vivo

      Gabor optical coherence tomographic angiography (GOCTA) (Part I): human retinal imaging in vivo
      Recently, parallel high A-line speed and wide field imaging for optical coherence tomography angiography (OCTA) has become more prevalent, resulting in a dramatic increase of data quantity which poses a challenge for real time imaging even for GPU in data processing. In this manuscript, we propose a new OCTA processing technique, Gabor optical coherence tomographic angiography (GOCTA), for label-free human retinal angiography imaging. In spectral domain optical coherence tomography (SDOCT ...
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    7. High speed, wide velocity dynamic range Doppler optical coherence tomography (Part V): Optimal utilization of multi-beam scanning for Doppler and speckle variance microvascular imaging

      High speed, wide velocity dynamic range Doppler optical coherence tomography (Part V): Optimal utilization of multi-beam scanning for Doppler and speckle variance microvascular imaging
      In this paper, a multi-beam scanning technique is proposed to optimize the microvascular images of human skin obtained with Doppler effect based methods and speckle variance processing. Flow phantom experiments were performed to investigate the suitability for combining multi-beam data to achieve enhanced microvascular imaging. To our surprise, the highly variable spot sizes (ranging from 13 to 77 m) encountered in high numerical aperture multi-beam OCT system imaging the same ...
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    8. Intraoperative optical coherence tomography of the cerebral cortex using a 7 degree-of freedom robotic arm

      Intraoperative optical coherence tomography of the cerebral cortex using a 7 degree-of freedom robotic arm
      Optical Coherence Tomography (OCT) provides a high-resolution imaging technique with limited depth penetration. The current use of OCT is limited to relatively small areas of tissue for anatomical structure diagnosis or minimally invasive guided surgery. In this study, we propose to image a large area of the surface of the cerebral cortex. This experiment aims to evaluate the potential difficulties encountered when applying OCT imaging to large and irregular surface ...
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    9. Graphics processor unit acceleration enables realtime endovascular Doppler optical coherence tomography imaging

      Graphics processor unit acceleration enables realtime endovascular Doppler optical coherence tomography imaging
      Endovascular Optical Coherence Tomography (OCT) has previously been used in both bench-top and clinical environments to produce vascular images, and can be helpful in characterizing, among other pathologies, plaque build-up and impedances to normal blood ow. The raw data produced can also be processed to yield high- resolution blood velocity information, but this computation is expensive and has previously only been available a posteriori using post-processing software. Real-time Doppler OCT ...
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    10. Multi-beam optical coherence tomography for microvascular imaging of human skin in vivo

      Multi-beam optical coherence tomography for microvascular imaging of human skin in vivo
      In this paper, a multi-beam optical coherence tomography (OCT) was used to reconstruct the microvascular image of human skin in vivo with phase resolved Doppler OCT (PRDOCT), phase resolved Doppler variance (PRDV) and speckle variance OCT (svOCT), in which the blood flow image was calculated by averaging the four blood flow images obtained by the four beams. In PRDOCT method, it is difficult to detect the blood flow perpendicular to ...
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    11. Differential standard deviation of log-scale intensity based optical coherence tomography angiography

      Differential standard deviation of log-scale intensity based optical coherence tomography angiography
      In this paper, a differential standard deviation of log-scale intensity (DSDLI) based optical coherence tomography angiography (OCTA) is presented for calculating microvascular images of human skin. The DSDLI algorithm calculates the variance in difference images of two consecutive log-scale intensity based structural images from the same position along depth direction to contrast blood flow. The en face microvascular images were then generated by calculating the standard deviation of the differential ...
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    12. Feature Of The Week 01/18/15: An Integrated Optical Coherence Tomography-Gas Nozzle System for Surgical Laser Ablation Applications

      Comment "Dear Ms. Kumar. Thank you for your comment. Please note all three articles you mentioned above are already on OCT ..." - Eric Swanson
      Feature Of The Week 01/18/15: An Integrated Optical Coherence Tomography-Gas Nozzle System for Surgical Laser Ablation Applications
      ... site of gas delivery. For more information see recent Article . Courtesy of Ronnie Wong and Victor Yang from Ryerson University . Gas assisted laser machining of materials is a common practice in the manufacturing indus...
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    13. Development of an integrated optical coherence tomography-gas nozzle system for surgical laser ablation applications: preliminary findings of in situ spinal cord deformation due to gas flow effects

      Development of an integrated optical coherence tomography-gas nozzle system for surgical laser ablation applications: preliminary findings of in situ spinal cord deformation due to gas flow effects
      ... Ryerson University, Toronto, Ontario, M5B 2K3, Canada ^2Department of Electrical and Computer Engineering, Ryerson University, Toronto, Ontario, M5B 2K3, Canada ^3Department of Surgical Neuromonitoring, Sunnybrook H...
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    14. Evaluation of flow velocities after carotid artery stenting through split spectrum Doppler optical coherence tomography and computational fluid dynamics modeling

      Evaluation of flow velocities after carotid artery stenting through split spectrum Doppler optical coherence tomography and computational fluid dynamics modeling
      ...Yang^1,^2,^3,^4,^* ^1Biophotonics and Bioengineering Laboratory, Dept. Electrical and Computer Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M5B 2K3, Canada ^2Physical Science - Brain Sciences Re...
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    15. Histogram flow mapping with optical coherence tomography for in vivo skin angiography of hereditary hemorrhagic telangiectasia

      Histogram flow mapping with optical coherence tomography for in vivo skin angiography of hereditary hemorrhagic telangiectasia
      ...te, Toronto M5B 1W8, Canada Brain Vascular Malformation Consortium HHT Investigator Group Victor X. D. Yang Ryerson University, Biophotonics and Bioengineering Laboratory, Toronto M5B 2K3, Canada Ryerson University, ...
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    16. A high-efficiency fiber-based imaging system for co-registered autofluorescence and optical coherence tomography

      A high-efficiency fiber-based imaging system for co-registered autofluorescence and optical coherence tomography
      We present a power-efficient fiber-based imaging system capable of co-registered autofluorescence imaging and optical coherence tomography (AF/OCT). The system employs a custom fiber optic rotary joint (FORJ) with an embedded dichroic mirror to efficiently combine the OCT and AF pathways. This three-port wavelength multiplexing FORJ setup has a throughput of more than 83% for collected AF emission, significantly more efficient compared to previously reported fiber-based methods. A custom 900 ...
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    17. High speed, wide velocity dynamic range Doppler optical coherence tomography (Part IV): split spectrum processing in rotary catheter probes

      High speed, wide velocity dynamic range Doppler optical coherence tomography (Part IV): split spectrum processing in rotary catheter probes
      ...D. Yang^1,^3,^4,^* ^1Biophotonics and Bioengineering Laboratory, Dept. Electrical and Computer Engineering, Ryerson University, Toronto, ON, Canada ^2Department of Integrative Oncology - Cancer Imaging Unit, British ...
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    18. 1-24 of 76 1 2 3 4 »
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  2. Organizations in the News

    1. (52 articles) University of Toronto
    2. (28 articles) Sunnybrook Health Sciences Centre
    3. (12 articles) Ontario Cancer Institute
    4. (6 articles) Nanjing University of Science and Technology
    5. (5 articles) University of Hong Kong
    6. (5 articles) British Columbia Cancer Agency
    7. (3 articles) Massachusetts General Hospital
    8. (3 articles) University of British Columbia
    9. (3 articles) Harvard University
    10. (3 articles) University of Waterloo
    11. (2 articles) Institute of Applied Physics
    12. (2 articles) National Research Council Canada
  3. People in the News

    1. (22 articles) Cuiru Sun
    2. (22 articles) Beau A. Standish
    3. (21 articles) Adrian Mariampillai
    4. (14 articles) Kenneth K. C. Lee
    5. (12 articles) I. Alex Vitkin
    6. (9 articles) Joel Ramjist
    7. (8 articles) Nigel R. Munce
    8. (7 articles) Brian C. Wilson
    9. (6 articles) Brian K. Courtney
    10. (6 articles) Ronnie Wong
    11. (6 articles) Stephen Lam
    12. (6 articles) Michael K. K. Leung
  4. OCT Companies in the News

    1. (4 articles) Conavi Medical Inc.
    2. (3 articles) Thorlabs
    3. (2 articles) Michelson Diagnostics
    4. (2 articles) St. Jude Medical
    5. (1 articles) Lantis Laser
    6. (1 articles) CardioSpectra
    7. (1 articles) Tomophase Corporation
    8. (1 articles) Heliotis AG
    9. (1 articles) Optopol Technology
    10. (1 articles) Carl Zeiss Meditec
    11. (1 articles) OCT Medical Imaging Inc
    12. (1 articles) NinePoint Medical