1. Joel Ramjist

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    1. Mentioned In 12 Articles

    2. 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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    3. 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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    4. 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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    5. 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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    6. 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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    7. 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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    8. 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
      Gas assisted laser machining of materials is a common practice in the manufacturing industry. Advantages in using gas assistance include reducing the likelihood of flare-ups in flammable materials and clearing away ablated material in the cutting path. Current surgical procedures and research do not take advantage of this and in the case for resecting osseous tissue, gas assisted ablation can help minimize charring and clear away debris from the surgical ...
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    9. 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
      ...es A. Smith, and Victor X.D. Yang »View Author Affiliations Ronnie Wong,^1,^7 Jamil Jivraj,^1 Barry Vuong,^1 Joel Ramjist,^1 Nicole A. Dinn,^1,^3 Cuiru Sun,^1 Yize Huang,^1 James A. Smith,^2 and Victor X.D. Yang^1,^4,^5...
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    10. 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
      ...rooq, Cuiru Sun, and Victor X.D. Yang »View Author Affiliations Barry Vuong,^1 Helen Genis,^1 Ronnie Wong,^1 Joel Ramjist,^1 Jamil Jivraj,^1 Hamza Farooq,^1 Cuiru Sun,^1 and Victor X.D. Yang^1,^2,^3,^4,^* ^1Biophotoni...
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    11. 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
      ... 2K3, Canada Ryerson University, Department of Electrical and Computer Engineering, Toronto M5B 2K3, Canada Joel Ramjist Ryerson University, Biophotonics and Bioengineering Laboratory, Toronto M5B 2K3, Canada Anne Cu...
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  2. About Joel Ramjist

    Joel Ramjist is at Ryerson University.