1. All Articles

    1-24 of 23127 1 2 3 4 ... 962 963 964 »
    1. Optical coherence tomography in oral cancer: A transpiring domain

      Optical coherence tomography in oral cancer: A transpiring domain

      Identification of oral cancer at an early curable stage not only aids in controlling the mortality and morbidity rate but also improves the quality of life of the patient. Indeed, regular monitoring of such life-threatening disease has held an imperative role in cancer diagnostics. Various light-based diagnostics are currently available to the clinician for early diagnosis of oral cancer. Optical coherence tomography (OCT) is one such emerging light-based diagnostic modality that provides noninvasive, real-time images at a depth of 1.5–2 mm and can also be compared to corresponding histopathological sections, hence this procedure can also be referred as ...

      Read Full Article
    2. Postdoctoral position in optical coherence tomography Department of Bioengineering, UC Riverside

      Postdoctoral position in optical coherence tomography Department of Bioengineering, UC Riverside

      Employer Description The University of California, Riverside is situated in a historic citrus growing area surrounded by mountain ranges. Riverside is about an hour away from ski slopes, surfing, or hiking in mountain or desert environments, and housing in the area is more affordable than in many other parts of southern California. UCR offers a unique combination of a world-class research university with an exceptionally diverse population, and is located in a prime position to take advantage of other universities, research institutes and biotech industries present in southern California. Job Description A postdoctoral research fellowship in the area of optical ...

      Read Full Article
    3. Multimodality coronary imaging to predict periprocedural myocardial necrosis after an elective percutaneous coronary intervention

      Multimodality coronary imaging to predict periprocedural myocardial necrosis after an elective percutaneous coronary intervention

      Background Although multiple imaging modalities have been tested to predict periprocedural myocardial necrosis (PMN), the superior predictive efficacy of these imaging findings has not been established fully. We sought to evaluate which findings of the coronary imaging tools would best provide predictive efficacy of PMN among optical coherence tomography (OCT), intravascular ultrasound (IVUS), and coronary computed tomography (CCT) angiography. Patients and methods A total of 130 patients with stable angina pectoris who underwent OCT, IVUS, and CCT examinations for a single de-novo preprocedural lesion were investigated. PMN was defined on the basis of two different thresholds of cardiac troponin I ...

      Read Full Article
    4. SURGICAL REMOVAL OF EPIRETINAL MEMBRANE WITH AND WITHOUT REMOVAL OF INTERNAL LIMITING MEMBRANE: Comparative Study of Visual Acuity, Features of Optical Coherence Tomography, and Recurrence Rate

      SURGICAL REMOVAL OF EPIRETINAL MEMBRANE WITH AND WITHOUT REMOVAL OF INTERNAL LIMITING MEMBRANE: Comparative Study of Visual Acuity, Features of Optical Coherence Tomography, and Recurrence Rate

      Purpose: To study and compare visual acuity, foveal thickness, outer limiting layer, ellipsoid zone, and recurrence rate in patients undergoing removal of the epiretinal membrane with and without the removal of the internal limiting membrane (ILM). Methods: Sixty-three patients who had the epiretinal membrane removed by a single surgeon were randomly assigned into 2 groups: Group 1 without additional removal of the ILM and Group 2 with removal of the ILM. Patients were followed up and evaluated at the first month, third month, and sixth month, postoperatively. Results: Patients from both groups had a gradual improvement in their vision over ...

      Read Full Article
    5. Automatic Side Branch Ostium Detection and Main Vascular Segmentation in Intravascular Optical Coherence Tomography Images

      Automatic Side Branch Ostium Detection and Main Vascular Segmentation in Intravascular Optical Coherence Tomography Images

      Intravascular optical coherence tomography (IVOCT) is the state-of-the-art imaging modality in percutaneous coronary intervention (PCI) planning and evaluation, in which side branch ostium and main vascular measurements play critical roles. However, manual measurement is time consuming and labor intensive. In this paper, we propose a fully automatic method for side branch ostium detection and main vascular segmentation to make up manual deficiency. In our method, side branch ostium points are firstly detected and subsequently used to divide the lumen contour into side branch and main vascular regions. Based on the division, main vascular contour is then smoothly fitted for segmentation ...

      Read Full Article
    6. Optical Coherence Tomography in Patients With Chronic Migraine: Literature Review and Update

      Optical Coherence Tomography in Patients With Chronic Migraine: Literature Review and Update

      Migraine is a chronic disease characterized by unilateral, pulsating, and often moderate-to-severe recurrent episodes of headache with nausea and vomiting. It affects approximately 15% of the general population, yet the underlying pathophysiological mechanisms are not fully understood. Optical coherence tomography (OCT) is a safe and reproducible diagnostic technique that utilizes infrared wavelengths and has a sensitivity of 8-10 micrometers. It can be used to measure thinning of the retinal nerve fiber layer (RNFL) in some neurological disorders. Although ophthalmologists are often the first specialists to examine patients with migraine, few studies have addressed the involvement of the optic nerve and ...

      Read Full Article
    7. IMAGING OF VITELLIFORM MACULAR LESIONS USING POLARIZATION-SENSITIVE OPTICAL COHERENCE TOMOGRAPHY

      IMAGING OF VITELLIFORM MACULAR LESIONS USING POLARIZATION-SENSITIVE OPTICAL COHERENCE TOMOGRAPHY

      Purpose: To examine the involvement of the retinal pigment epithelium (RPE) in the presence of vitelliform macular lesions (VML) in Best vitelliform macular dystrophy (BVMD), autosomal recessive bestrophinopathy, and adult-onset vitelliform macular degeneration using polarization-sensitive optical coherence tomography (PS-OCT). Methods: A total of 35 eyes of 18 patients were imaged using a PS-OCT system and blue light fundus autofluorescence imaging. Pathogenic mutations in the BEST1 gene, 3 of which were new, were detected in all patients with BVMD and autosomal recessive bestrophinopathy. Results: Polarization-sensitive optical coherence tomography showed a characteristic pattern in all three diseases with nondepolarizing material in the ...

      Read Full Article
    8. Post Doc Position for Adaptive Optics Optical Coherence Tomography at the Medical University Vienna

      Post Doc Position for Adaptive Optics Optical Coherence Tomography at the Medical University Vienna

      A PostDoc position will be available from January 1, 2018 at the Center for Medical Physics and Biomedical Engineering, Medical University of Vienna. (https://zmpbmt.meduniwien.ac.at/) The candidate will work within the framework of a European Project (Horizon 2020) in the field of Adaptive Optics Optical Coherence Tomography (AO-OCT). The project duration and total employment time will be three years. The annual income of the position for full time employment will be ~50kEuros. The successful candidate has a PhD in, physics, engineering sciences, biomedical engineering or equivalent with an outstanding record in her/his field of research. She ...

      Read Full Article
    9. Retinal thickness measured with optical coherence tomography and risk of disability worsening in multiple sclerosis: a cohort study

      Retinal thickness measured with optical coherence tomography and risk of disability worsening in multiple sclerosis: a cohort study

      Background Most patients with multiple sclerosis without previous optic neuritis have thinner retinal layers than healthy controls. We assessed the role of peripapillary retinal nerve fibre layer (pRNFL) thickness and macular volume in eyes with no history of optic neuritis as a biomarker of disability worsening in a cohort of patients with multiple sclerosis who had at least one eye without optic neuritis available. Methods In this multicentre, cohort study, we collected data about patients (age ≥16 years old) with clinically isolated syndrome, relapsing-remitting multiple sclerosis, and progressive multiple sclerosis. Patients were recruited from centres in Spain, Italy, France, Germany ...

      Read Full Article
    10. In Vivo Non-Destructive Monitoring of Capsicum Annuum Seed Growth with Diverse NaCl Concentrations Using Optical Detection Technique

      In Vivo Non-Destructive Monitoring of Capsicum Annuum Seed Growth with Diverse NaCl Concentrations Using Optical Detection Technique

      We demonstrate that optical coherence tomography (OCT) is a plausible optical tool for in vivo detection of plant seeds and its morphological changes during growth. To investigate the direct impact of salt stress on seed germination, the experiment was conducted using Capsicum annuum seeds that were treated with different molar concentrations of NaCl. To determine the optimal concentration for the seed growth, the seeds were monitored for nine consecutive days. In vivo two-dimensional OCT images of the treated seeds were obtained and compared with the images of seeds that were grown using sterile distilled water. The obtained results confirm the ...

      Read Full Article
    11. Widely tunable short cavity laser

      Widely tunable short cavity laser

      A tunable source includes a short-cavity laser optimized for performance and reliability in SSOCT imaging systems, spectroscopic detection systems, and other types of detection and sensing systems. The short cavity laser has a large free spectral range cavity, fast tuning response and single transverse, longitudinal and polarization mode operation, and includes embodiments for fast and wide tuning, and optimized spectral shaping. Disclosed are both electrical and optical pumping in a MEMS-VCSEL geometry with mirror and gain regions optimized for wide tuning, high output power, and a variety of preferred wavelength ranges; and a semiconductor optical amplifier, combined with the short-cavity ...

      Read Full Article
    12. Spectral-Domain Optical Coherence Tomography Angiography for the Diagnosis and Evaluation of Polypoidal Choroidal Vasculopathy

      Spectral-Domain Optical Coherence Tomography Angiography for the Diagnosis and Evaluation of Polypoidal Choroidal Vasculopathy

      Purpose: To compare the diagnostic ability of optical coherence tomography angiography (OCTA) with indocyanine green angiography (ICGA) in polypoidal choroidal vasculopathy (PCV). Methods: Retrospective review of 47 eyes with PCV imaged with ICGA and OCTA. For each eye, it was determined which imaging modality better delineated the PCV complex. The presence of a branching vascular network (BVN) and polyp(s) were noted. Results: PCV was better visualized with ICGA in 21 eyes (44.7%) and with OCTA in 9 eyes (19.2%). The results were comparable in 17 eyes (36.2%). Of the 44 eyes with BVN on ICGA, 41 ...

      Read Full Article
    13. Optical Coherence Tomography in Macular Diseases and Glaucoma - Basic Knowledge

      Optical Coherence Tomography in Macular Diseases and Glaucoma - Basic Knowledge

      OCT has shed a discerning light on conditions related to vitreo-retinal interface such as vitreo-macular traction and macular holes. Another significant use of OCT is in its ability to enhance long follow ups of various retinal conditions in a quantitative and non -invasive manner. OCT images contain much information on the retina structure and have an important role in the evaluation of the disease progression and the response to therapy.

      Read Full Article
    14. The Evolution of the Plateau, an Optical Coherence Tomography Signature Seen in Geographic Atrophy

      The Evolution of the Plateau, an Optical Coherence Tomography Signature Seen in Geographic Atrophy

      We read with interest the article by Tan et al. 1 entitled “The Evolution of the Plateau, an Optical Coherence Tomography Signature Seen in Geographic Atrophy.” We congratulate the authors for the excellent description of the origins and long-term evolution of an optical coherence tomography (OCT) feature named “plateau” in nascent geographic atrophy and for proposing its histologic correlate. Querques et al. 2 first reported this tomographic signature in geographic atrophy with the name of “wedge-shaped subretinal hyporeflectivity.” However, the authors renamed this finding for the following reasons. First, they raise concerns for having two “hyporeflective wedge'' descriptors in the ...

      Read Full Article
    15. Three-dimensional mapping of peripapillary retinal layers using a spectral domain optical coherence tomography

      Three-dimensional mapping of peripapillary retinal layers using a spectral domain optical coherence tomography

      Purpose: To map and view the effects of age, gender, and axial length on seven individual retinal layers around the optic nerve head (ONH). Methods: We scanned 242 healthy patients using the Spectralis spectral domain optical coherence tomography in an outpatient setting. The layers were observed on the Early Treatment Diabetic Retinopathy Study sectors using the standard Spectralis Family Acquisition Module 6.0.11.0. The center was the ONH, the inner circle (IC) was 1–3 mm away, and the outer circle (OC) was 3–6 mm away. The seven layers were retinal nerve fiber layer (RNFL), ganglion cell ...

      Read Full Article
    16. Study by ARVO authors finds vision research pays for itself

      Study by ARVO authors finds vision research pays for itself

      Manage ARVO e-News Search Back Issues In This Issue Just published: Study by ARVO authors finds vision research pays for itself Events and education Registration is open for the Ocular Oncogenesis and Oncology Conference Take the Online Education courses: Big data and Demystifying statistics Members in the news In memoriam In remembrance U.S. Advocacy Updated NIH clinical trials definition goes into effect ARVOJobs Openings in several U.S. cities Grants and awards Funding opportunities Awards Just published: Study by ARVO authors finds vision research pays for itself Researchers have shown that optical coherence tomography (OCT) has saved Medicare $9 ...

      Read Full Article
    17. Beyond backscattering: Optical neuroimaging by BRAD

      Beyond backscattering: Optical neuroimaging by BRAD

      Optical coherence tomography (OCT) is a powerful technology for rapid volumetric imaging in biomedicine. The bright field imaging approach of conventional OCT systems is based on the detection of directly backscattered light, thereby waiving the wealth of information contained in the angular scattering distribution. Here we demonstrate that the unique features of few-mode fibers (FMF) enable simultaneous bright and dark field (BRAD) imaging for OCT. As backscattered light is picked up by the different modes of a FMF depending upon the angular scattering pattern, we obtain access to the directional scattering signatures of different tissues by decoupling illumination and detection ...

      Read Full Article
    18. Ten years follow-up after surgery for a foveal detachment due to optic disc pit: a case report of outer retinal layer healing

      Ten years follow-up after surgery for a foveal detachment due to optic disc pit: a case report of outer retinal layer healing

      Background To report a case of complete progressive visual recovery and healing of outer retinal layers after vitrectomy for foveal detachment associated with optic disc pit. Case presentation Optical coherence tomography (OCT) follow-up was performed on a 15-year-old boy with deep optic disc pit and foveal detachment, before and for 10 years after vitrectomy with gas. The foveal detachment was successfully reattached with complete reapplication of the retina. OCT scans showed a progressive long-term retinal healing with reappearance of the ellipsoid line and visual acuity improved from 20/100 before surgery to 20/25, 10 years after surgery. Conclusions Photoreceptor ...

      Read Full Article
    19. Ultrahigh-Resolution Optical Coherence Elastography Images Cellular-Scale Stiffness of Mouse Aorta

      Ultrahigh-Resolution Optical Coherence Elastography Images Cellular-Scale Stiffness of Mouse Aorta

      Cellular-scale imaging of the mechanical properties of tissue has helped to reveal the origins of disease; however, cellular-scale resolution is not readily achievable in intact tissue volumes. Here, we demonstrate volumetric imaging of Young’s modulus using ultrahigh-resolution optical coherence elastography, and apply it to characterizing the stiffness of mouse aortas. We achieve isotropic resolution of better than 15 μ m over a 1-mm lateral field of view through the entire depth of an intact aortic wall. We employ a method of quasi-static compression elastography that measures volumetric axial strain and uses a compliant, transparent layer to measure surface axial stress ...

      Read Full Article
    20. Heart-rate sensitive optical coherence angiography for measuring vascular changes due to posttraumatic brain injury in micecal coherence tomography findings in Parkinson's disease

      Heart-rate sensitive optical coherence angiography for measuring vascular changes due to posttraumatic brain injury in micecal coherence tomography findings in Parkinson's disease

      Traumatic brain injury (TBI) results in direct vascular disruption, triggering edema, and reduction in cerebral blood flow. Therefore, understanding the pathophysiology of brain microcirculation following TBI is important for the development of effective therapies. Optical coherence angiography (OCA) is a promising tool for evaluating TBI in rodent models. We develop an approach to OCA that uses the heart-rate frequency to discriminate between static tissue and vasculature. This method operates on intensity data and is therefore not phase sensitive. Furthermore, it does not require spatial overlap of voxels and thus can be applied to pre-existing datasets for which oversampling may not ...

      Read Full Article
    1-24 of 23127 1 2 3 4 ... 962 963 964 »
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. Popular Articles

  3. Optical Coherence Tomography News

    See all Optical Coherence Tomography News articles
  4. Organizations in the News

    1. (736 articles) Harvard University
    2. (622 articles) National Institutes of Health
    3. (612 articles) Massachusetts General Hospital
    4. (555 articles) Massachusetts Institute of Technology
    5. (457 articles) Duke University
    6. (385 articles) Medical University of Vienna
    7. (381 articles) University of Miami
    8. (368 articles) Johns Hopkins University
    9. (359 articles) Oregon Health & Science University
    10. (341 articles) FDA
  5. People in the News

    1. (390 articles) James G. Fujimoto
    2. (299 articles) David Huang
    3. (263 articles) Joseph A. Izatt
    4. (260 articles) Ruikang K. Wang
    5. (218 articles) Guillermo J. Tearney
    6. (211 articles) Stephen A. Boppart
    7. (206 articles) Zhongping Chen
    8. (205 articles) Adrian G. Podoleanu
    9. (191 articles) Brett E. Bouma
    10. (185 articles) Patrick W. Serruys
  6. OCT Companies in the News

    1. (1564 articles) Carl Zeiss Meditec
    2. (786 articles) St. Jude Medical
    3. (624 articles) Heidelberg Engineering
    4. (599 articles) Optovue
    5. (392 articles) Topcon Medical Systems
    6. (331 articles) Volcano Corporation
    7. (250 articles) Michelson Diagnostics
    8. (223 articles) Bioptigen
    9. (215 articles) Thorlabs
    10. (150 articles) Axsun Technologies