1. Articles mentioning both Sunnybrook Health Sciences Centre and Victor X. D. Yang

    1-24 of 41 1 2 »
    1. Endovascular optical coherence tomography imaging in cerebrovascular disease

      Endovascular optical coherence tomography imaging in cerebrovascular disease
      Endovascular optical coherence tomography (OCT) is the highest resolution imaging modality currently available with spatial resolution of 10 m. Although originally developed for interventional cardiology, the ability to visualize the luminal environment and anatomy, along with the stent-vessel interaction could be of great utility for various cerebrovascular diseases, and the adoption of endovascular OCT imaging in the evolving field of interventional neuroradiology seems instinctive. The purpose of this study is ...
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    2. Real-time en-face Gabor optical coherence tomographic angiography on human skin using CUDA GPU

      Real-time en-face Gabor optical coherence tomographic angiography on human skin using CUDA GPU
      We recently proposed an optical coherence tomographic angiography (OCTA) algorithm, Gabor optical coherence tomographic angiography (GOCTA), which can extract microvascular signals from a spectral domain directly with lower computational complexity compared to other algorithms. In this manuscript, we combine a programmable swept source, an OCT complex signal detecting unit, and graphics process units (GPU) to achieve a real-time en-face GOCTA system for human skin microvascular imaging. The programmable swept source ...
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    3. Gabor optical coherence tomographic angiography (GOCTA) (Part II): theoretical basis of sensitivity improvement and optimization for processing speed

      Gabor optical coherence tomographic angiography (GOCTA) (Part II): theoretical basis of sensitivity improvement and optimization for processing speed
      We previously proposed a Gabor optical coherence tomography angiography (GOCTA) algorithm for spectral domain optical coherence tomography (SDOCT) to extract microvascular signals from spectral fringes directly, with speed improvement of 4 to 20 times over existing methods. In this manuscript, we explored the theoretical basis of GOCTA with comparison of experimental data using solid and liquid displacement sample targets, demonstrating that the majority of the GOCTA sensitivity advantage over speckle ...
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    4. Optical Coherence Tomography Guided Antithrombotic Treatment After Endovascular Thrombectomy of the Posterior Circulation

      Optical Coherence Tomography Guided Antithrombotic Treatment After Endovascular Thrombectomy of the Posterior Circulation
      Evidence regarding the role of early (24 hours) antithrombotics post-revascularization with either intravenous thrombolysis (IVT), endovascular thrombectomy (EVT), or a combination of both remains scarce. In 2018 the American Heart Association/American Stroke Association changed their recommendation, stating that the risk of antithrombotic therapy within the first 24 hours after treatment with IVT (with or without EVT) is uncertain. This was changed after data emerged that early antithrombotics may be ...
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    5. Optical coherence tomography–guided flow diversion for aneurysmal treatment

      Optical coherence tomography–guided flow diversion for aneurysmal treatment
      A 28-year-old man presenting with right third nerve palsy was diagnosed with a giant unruptured aneurysm supplied by the right posterior communicating and cerebral arteries (figure 1, A and B). The aneurysm was treated with flow-diverting stent-assisted coiling. Two months later, he presented with new-onset left-sided weakness, and MRI showed increased edema in the thalamus (figure 1C) and increased aneurysm size and no filling. There was no evidence of stent ...
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    6. Optical coherence tomography imaging after endovascular thrombectomy for basilar artery occlusion: report of 3 cases

      Optical coherence tomography imaging after endovascular thrombectomy for basilar artery occlusion: report of 3 cases
      Studies evaluating individuals for endothelial injury after endovascular thrombectomy (EVT) have been done by means of retrieved human thrombus, MR vessel-wall imaging, and animal histopathological studies. These techniques have limitations, because MR imaging has insufficient spatial resolution to directly visualize endothelium, and histopathological examinations are performed ex vivo and are unable to provide real-time patterns of injury. The purpose of the current study was to obtain in vivo intraluminal imaging ...
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    7. 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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    8. Optical Coherence Tomography as an Adjunct During Carotid Artery Stenting for Carotid Atherosclerotic Disease

      Optical Coherence Tomography as an Adjunct During Carotid Artery Stenting for Carotid Atherosclerotic Disease
      Purpose Carotid artery stenting (CAS) has been proven to decrease the risk of stroke in symptomatic patients with moderate/high-grade carotid stenosis; however, there is an increased periprocedural risk of stroke with CAS compared to carotid endarterectomy. The goal of this article is to report the utilization of endovascular optical coherence tomography (OCT) during CAS to aid in the identification of stent malapposition, plaque prolapse, and adjacent residual thrombus that ...
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    9. 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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    10. 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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    11. 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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    12. 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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    13. 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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    14. 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
      ...sion depth at the 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 ma...
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    15. 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
      ...versity of Toronto, 27 King’s College Circle, Toronto, Ontario, M5S 1A1, Canada ^5Division of Neurosurgery, Sunnybrook Health Sciences Centre, 2075 Bayview Ave., Toronto, Ontario, M4N 3M5, Canada ^6Physical Sciences ...
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    16. 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
      ...Sunnybrook Research Institute, 2075 Bayview Avenue,Toronto, ON, M4N 3M5, Canada ^3Division of Neurosurgery, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue Toronto, ON, M4N 3M5, Canada ^4Division of Neurosurge...
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    17. 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
      ...K3, Canada Ryerson University, Department of Electrical and Computer Engineering, Toronto M5B 2K3, Canada Sunnybrook Health Science Centre, Division of Neurosurgery, Toronto M4N 3M5, Canada J. Biomed. Opt. 19(8), 086...
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    18. Imaging probe with combined ultrasound and optical means of imaging

      Imaging probe with combined ultrasound and optical means of imaging
      The present invention provides an imaging probe for imaging mammalian tissues and structures using high resolution imaging, including high frequency ultrasound and optical coherence tomography. The imaging probes structures using high resolution imaging use combined high frequency ultrasound (IVUS) and optical imaging methods such as optical coherence tomography (OCT) and to accurate co-registering of images obtained from ultrasound image signals and optical image, signals during scanning a region of interest.
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    19. Medical imaging probe with rotary encoder

      Medical imaging probe with rotary encoder
      The present invention provides minimally invasive imaging probe having an optical encoder integrated therewith for accurately measuring or estimating the rotational velocity near the distal end of the medical device, such as an imaging probe which undergoes rotational movement during scanning of surrounding tissue in bodily lumens and cavities.
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    20. 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
      ...er Imaging Unit, British Columbia Cancer Research Centre, Vancouver, BC, Canada ^3Division of Neurosurgery, Sunnybrook Health Sciences Centre, Toronto, ON, Canada ^4Division of Neurosurgery, Faculty of Medicine, Univ...
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    21. Digital image correlation–based optical coherence elastography

      Digital image correlation–based optical coherence elastography
      Optical coherence elastography (OCE) provides deformation or material properties, mapping of soft tissue. We aim to develop a robust speckle tracking OCE technique with improved resolution and accuracy. A digital image correlation (DIC)-based OCE technique was developed by combining an advanced DIC algorithm with optical coherence tomography (OCT). System calibration and measurement error evaluation demonstrated that this DIC-based OCE technique had a resolution of 0.6 m displacement and ...
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    22. 1-24 of 41 1 2 »
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  2. Organizations in the News

    1. (31 articles) University of Toronto
    2. (31 articles) Ryerson University
    3. (5 articles) Nanjing University of Science and Technology
    4. (4 articles) Ontario Cancer Institute
    5. (3 articles) University of Hong Kong
    6. (2 articles) Harvard University
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  3. People in the News

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

    1. (3 articles) Conavi Medical Inc.