Microscopy -Optical Coherence Tomography News

Articles in category: Microscopy

1-24 of 479 1 2 3 4 ... 18 19 20 »
1. Real time dual mode full-field optical coherence microscopy with full range imaging
  
  Explore uspto.gov Jan 29 2019 Microscopy , Patents
  
  The invention is a system and method that enable obtaining ultra-high resolution interference, phase and OCT images at high speed. The system uses neither mechanical moving elements nor any optical/electro optical modulating means for obtaining the OCT images. Two OCT operating modes are available: for ultra-high resolution the system allows either spatial coherence TD-FF-OCT or temporal coherence TD-FF-OCT imaging, whereas for high resolution and ultra-high speed the system allows FD-FF-OCT imaging with full range imaging. In the TD mode, the OCT enface images are obtained in real time. In the FD mode, the 2D complex signal is reconstructed in ...
  Read Full Article
  
  Comment
2. Method for correcting an OCT image and combination microscope
  
  Explore uspto.gov Jan 22 2019 Microscopy , Patents
  
  A method for improving an OCT image of an object such as the retina of an eye, using optical coherence tomography by an imaging beam path. In order to suppress shadowing effects due to a surgical instrument moved in the imaging beam path, a time series of OCT images is produced. For an OCT image to be corrected, an area of the object lying in the image and shadowed by the instrument is determined. Another earlier OCT image in which the area of the object is not shadowed is searched in the time series. Image information for the area of ...
  Read Full Article
  
  Comment
  
  Mentions: Carl Zeiss Meditec
3. In Vivo Rat Brain Imaging through Full-Field Optical Coherence Microscopy Using an Ultrathin Short Multimode Fiber Probe
  
  Explore MDPI Open Access Journals Platform Jan 9 2019 Microscopy , Neurology
  
  We demonstrate full-field optical coherence microscopy (OCM) using an ultrathin forward-imaging short multimode fiber (SMMF) probe with a core diameter of 50 μm, outer diameter of 125 μm, and length of 7.4 mm, which is a typical graded-index multimode fiber used for optical communications. The axial and lateral resolutions were measured to be 2.14 μm and 2.3 μm, respectively. By inserting the SMMF 4 mm into the cortex of an in vivo rat brain, scanning was performed to a depth of 147 μm from the SMMF facet with a field of view of 47 μm. Three-dimensional (3D ...
  Read Full Article
  
  Comment
  
  Mentions: Manabu Sato Yamagata University
4. In vivo confocal microscopy and anterior segment optical coherence tomography follow-up of cysteamine treatment in corneal cystinosis
  
  Explore Indian Journal of Ophthalmology (IJO) Dec 21 2018 Microscopy , Ophthalmology
  
  A 36-year-old female presented initially with photophobia and visual deterioration. After examination and laboratory tests, patient was diagnosed with cystinosis. Cysteamine drops 4 × 1 drops/day was given as treatment for 1 year. During follow-up, in vivo confocal microscopy (IVCM) and anterior segment optical coherence tomography (AS-OCT) was performed. Photophobia was relieved and IVCM obtained the decrease in size and density of corneal crystals 1 year after. Depth of corneal crystals did not change but crystal density score reduced with cysteamine treatment.
  Read Full Article
  
  Comment
5. In Vivo and Ex Vivo Microscopy: Moving Toward the Integration of Optical Imaging Technologies Into Pathology Practice
  
  Explore archivesofpathology.org Dec 15 2018 Microscopy
  
  The traditional surgical pathology assessment requires tissue to be removed from the patient, then processed, sectioned, stained, and interpreted by a pathologist using a light microscope. Today, an array of alternate optical imaging technologies allow tissue to be viewed at high resolution, in real time, without the need for processing, fixation, freezing, or staining. Optical imaging can be done in living patients without tissue removal, termed in vivo microscopy, or also in freshly excised tissue, termed ex vivo microscopy. Both in vivo and ex vivo microscopy have tremendous potential for clinical impact in a wide variety of applications. However, in ...
  Read Full Article
  
  Comment
  
  Mentions: Guillermo J. Tearney Massachusetts General Hospital Harvard University
6. 250 kHz, 1.5 µm resolution SD-OCT for in-vivo cellular imaging of the human cornea
  
  Explore OSA | OSA Publishing Nov 29 2018 Microscopy , Ophthalmology
  
  We present the first spectral domain optical coherence tomography (SD-OCT) system that combines an isotropic imaging resolution of ~1.5 µm in biological tissue with a 250 kHz image acquisition rate, for in vivo non-contact, volumetric imaging of the cellular structure of the human cornea. OCT images of the healthy human cornea acquired with this system reveal the cellular structure of the corneal epithelium, cellular debris and mucin clusters in the tear film, the shape, size and spatial distribution of the sub-basal corneal nerves and keratocytes in the corneal stroma, as well as reflections from endothelial nuclei. The corneal images ...
  Read Full Article
  
  Comment
  
  Mentions: University of Waterloo Singapore Eye Research Institute Kostadinka K. Bizheva
7. Superparamagnetic graphene quantum dot as a dual‐modality contrast agent for confocal fluorescence microscopy and magnetomotive optical coherence tomography
  
  Explore Wiley Online Library Oct 22 2018 Microscopy
  
  A magnetic graphene quantum dot (MGQD) nanoparticle, synthesized by hydrothermally reducing and cutting graphene oxide‐iron oxide sheet, was demonstrated to possess the capabilities of simultaneous confocal fluorescence and magnetomotive optical coherence tomography (MMOCT) imaging. This MGQD shows low toxicity, significant tunable blue fluorescence and superparamagnetism, which can thus be used as a dual‐modality contrast agent for confocal fluorescence microscopy (CFM) and MMOCT. The feasibility of applying MGQD as a tracer of cells is shown by imaging and visualizing MGQD labeled cells using CFM and our in‐house MMOCT. Since MMOCT and CFM can offer anatomical structure and intracellular ...
  Read Full Article
  
  Comment
  
  Mentions: University of Sheffield Steven J. Matcher
8. Computer-Aided Diagnosis of Label-Free 3-D Optical Coherence Microscopy Images of Human Cervical Tissue
  
  Explore arxiv.org Oct 2 2018 Gynecology , Microscopy
  
  : Ultrahigh-resolution optical coherence microscopy (OCM) has recently demonstrated its potential for accurate diagnosis of human cervical diseases. One major challenge for clinical adoption, however, is the steep learning curve clinicians need to overcome to interpret OCM images. Developing an intelligent technique for computer-aided diagnosis (CADx) to accurately interpret OCM images will facilitate clinical adoption of the technology and improve patient care. Methods: 497 high-resolution 3-D OCM volumes (600 cross-sectional images each) were collected from 159 ex vivo specimens of 92 female patients. OCM image features were extracted using a convolutional neural network (CNN) model, concatenated with patient information (e.g ...
  Read Full Article
  
  Comment
  
  Mentions: Lehigh University Chao Zhou
9. A Novel OCT Design for Cultural Heritage Applications
  
  Explore Cambridge University Press Aug 12 2018 Art , Microscopy , NDE/NDT
  
  The object challenges presented by cultural heritage materials can serve as a catalyst for the development of novel characterization techniques.
  Read Full Article
  
  Comment
  
  Mentions: Northwestern University
10. Multimodal Optical Imaging for Pretreatment Evaluation for Cutaneous Microparticle Delivery
  
  Explore Home - ClinicalTrials.gov Jun 29 2018 Dermatology , Microscopy , Clinical Trials
  
  Brief Summary: The purpose of this study is to investigate how pretreatment with a topical medication for acne affects application and delivery of gold microparticles to the skin in acne patients. In addition, the investigators want to investigate the biodistribution of gold microparticles in pretreated skin and compare this with the biodistribution of untreated skin using the non-invasive imaging techniques optical coherence tomography and reflectance confocal microscopy. Reflectance Confocal Microscopy (RCM) and Optical Coherence Tomography (OCT) are non-invasive imaging technologies allowing for imaging of the upper skin layers. Gold microparticles have been shown to have a contrast effect on the ...
  Read Full Article
  
  Comment
11. Volumetric optical coherence microscopy with a high space-bandwidth-time product enabled by hybrid adaptive optics
  
  Explore OSA | OSA Publishing Jun 19 2018 Microscopy
  
  Optical coherence microscopy (OCM) is a promising modality for high resolution imaging, but has limited ability to capture large-scale volumetric information about dynamic biological processes with cellular resolution. To enhance the throughput of OCM, we implemented a hybrid adaptive optics (hyAO) approach that combines computational adaptive optics with an intentionally aberrated imaging beam generated via hardware adaptive optics. Using hyAO, we demonstrate the depth-equalized illumination and collection ability of an astigmatic beam compared to a Gaussian beam for cellular-resolution imaging. With this advantage, we achieved volumetric OCM with a higher space-bandwidth- time product compared to Gaussian-beam acquisition that employed focus-scanning ...
  Read Full Article
  
  Comment
  
  Mentions: Cornell University Steven G. Adie
12. Surface emitting laser, laser array, light source device, information acquisition device, and optical coherence tomography apparatus
  
  Explore uspto.gov Jun 5 2018 Microscopy , Patents , Tunable Sources
  
  Provided is a surface emitting laser that is to be excited by an external light source and in which a light-emitting position is defined. A surface emitting laser includes a pair of reflecting mirrors (11, 15) and an active layer (13) that is arranged between the pair of reflecting mirrors (11, 15) and that is to be excited by light that is radiated from an external light source. A gap is formed between the active layer and one of the pair of reflecting mirrors (15), the oscillation wavelength of the surface emitting laser is changed, and a defining structure (20 ...
  Read Full Article
  
  Comment
  
  Mentions: Canon Medical Systems
13. Microscopy system with auto-focus adjustment by low-coherence interferometry
  
  Explore uspto.gov Jun 5 2018 Microscopy , Patents
  
  Disclosed are several technical approaches of using low coherence interferometry techniques to create an autofocus apparatus for optical microscopy. These approaches allow automatic focusing on thin structures that are positioned closely to reflective surfaces and behind refractive material like a cover slip, and automated adjustment of focus position into the sample region without disturbance from reflection off adjacent surfaces. The measurement offset induced by refraction of material that covers the sample is compensated for. Proposed are techniques of an instrument that allows the automatic interchange of imaging objectives in a low coherence interferometry autofocus system, which is of major interest ...
  Read Full Article
  
  Comment
  
  Mentions: Thorlabs Alex E. Cable James Y. Jiang
14. Optical coherence tomography systems integrated with surgical microscopes
  
  Explore uspto.gov Mar 27 2018 Microscopy , Patents
  
  Some embodiments of the present inventive concept provide optical coherence tomography (OCT) systems for integration with a microscope. The OCT system includes a sample arm coupled to the imaging path of a microscope. The sample arm includes an input beam zoom assembly including at least two movable lenses configured to provide shape control for an OCT signal beam; a scan assembly including at least one scanning mirror and configured for telecentric scanning of the OCT signal beam; and a beam expander configured to set the OCT signal beam diameter incident on the microscope objective. The shape control includes separable controls ...
  Read Full Article
  
  Comment
  
  Mentions: Eric L. Buckland Bioptigen
15. Clinical Translation of Tethered Confocal Microscopy Capsule for Unsedated Diagnosis of Eosinophilic Esophagitis
  
  Explore Nature Publishing Group Feb 8 2018 Gastroenterology , Microscopy
  
  Esophagogastroduodenoscopy (EGD) is a widely used procedure, posing significant financial burden on both healthcare systems and patients. Moreover, EGD is time consuming, sometimes difficult to tolerate, and suffers from an imperfect diagnostic yield as the limited number of collected biopsies does not represent the whole organ. In this paper, we report on technological and clinical feasibility of a swallowable tethered endomicroscopy capsule, which is administered without sedation, to image large regions of esophageal and gastric mucosa at the cellular level. To demonstrate imaging capabilities, we conducted a human pilot study (n = 17) on Eosinophilic Esophagitis (EoE) patients and healthy volunteers ...
  Read Full Article
  
  Comment
  
  Mentions: Guillermo J. Tearney Massachusetts General Hospital Harvard University
16. Actinic Keratosis and Non-Invasive Diagnostic Techniques: An Update
  
  Explore MDPI Open Access Journals Platform Jan 8 2018 Dermatology , Microscopy , Oncology
  
  Actinic keratosis represents the earliest manifestation of non-melanoma skin cancer. Because of their risk of progression to invasive squamous cell carcinoma, an earlier diagnosis and treatment are mandatory. Their diagnosis sometimes could represent a challenge even for expert dermatologists. Dermoscopy, confocal laser microscopy and optical coherence tomography could help clinicians in diagnosis. .
  Read Full Article
  
  Comment
17. Visible Light Optical Coherence Microscopy of the Brain with Isotropic Femtoliter Resolution In Vivo
  
  Explore OSA | OSA Publishing Dec 2 2017 Microscopy , Neurology
  
  Most flying-spot Optical Coherence Tomography (OCT) and Optical Coherence Microscopy (OCM) systems use a symmetric confocal geometry, where the detection path retraces the illumination path starting from and ending with the spatial mode of a single mode optical fiber. Here, we describe a visible light OCM instrument that breaks this symmetry to improve transverse resolution without sacrificing collection efficiency. This was achieved by overfilling a water immersion objective on the illumination path, while maintaining a conventional Gaussian mode detection path (1/e2 intensity diameter ~0.82 Airy disks), enabling ~1.1 μm full-width at half-maximum (FWHM) transverse resolution. At the ...
  Read Full Article
  
  Comment
  
  Mentions: Vivek J. Srinivasan Stanford University UC Davis
18. Interferometric synthetic aperture microscopy for extended focus optical coherence microscopy
  
  Explore OSA | OSA Publishing Nov 28 2017 Microscopy
  
  Optical coherence microscopy (OCM) is an interferometric technique providing 3D images of biological samples with micrometric resolution and penetration depth of several hundreds of micrometers. OCM differs from optical coherence tomography (OCT) in that it uses a high numerical aperture (NA) objective to achieve high lateral resolution. However, the high NA also reduces the depth-of-field (DOF), scaling with 1/NA 2 . Interferometric synthetic aperture microscopy (ISAM) is a computed imaging technique providing a solution to this trade-off between resolution and DOF. An alternative hardware method to achieve an extended DOF is to use a non-Gaussian illumination. Extended focus OCM (xfOCM ...
  Read Full Article
  
  Comment
  
  Mentions: Ecole Polytechnique Fédérale de Lausanne Theo Lasser
19. Surgical microscope with integrated optical coherence tomography and display systems
  
  Explore uspto.gov Nov 28 2017 Microscopy , Ophthalmology , Patents
  
  An ophthalmic surgical microscope includes a beam coupler positioned along an optical path of the surgical microscope between a first eyepiece and magnifying/focusing optics, the beam coupler operable to direct the OCT imaging beam along a first portion of the optical path of the surgical microscope between the beam coupler and a patient's eye (an OCT image being generated based on a reflected portion of the OCT imaging beam). The surgical microscope additionally includes a real-time data projection unit operable to project the OCT image generated by the OCT system and a beam splitter positioned along the optical ...
  Read Full Article
  
  Comment
  
  Mentions: Lingfeng Yu
20. Real-time and non-invasive measurements of cell mechanical behaviour with optical coherence phase microscopy
  
  Explore ScienceDirect Nov 21 2017 Microscopy
  
  Cell mechanical behaviour is increasingly recognised as a central biophysical parameter in cancer and stem cell research, and methods of investigating their mechanical behaviour are therefore needed. We have developed a novel qualitative method based on quantitative phase imaging which is capable of investigating cell mechanical behaviour in real-time at cellular resolution using optical coherence phase microscopy (OCPM), and stimulating the cells non-invasively using hydrostatic pressure. The method was exemplified to distinguish between cells with distinct mechanical properties, and transient change induced by Cytochalasin D. We showed the potential of quantitative phase imaging to detect nanoscale intracellular displacement induced by ...
  Read Full Article
  
  Comment
21. Spectrally Encoded Coherence Tomography and Reflectometry (SECTR): simultaneous en face and cross-sectional imaging at 2 gigapixels-per-second
  
  Explore Wiley Online Library Nov 17 2017 Microscopy
  
  Non-invasive biological imaging is crucial for understanding in vivo structure and function. Optical coherence tomography (OCT) and reflectance confocal microscopy are two of the most widely used optical modalities for exogenous contrast-free high-resolution three-dimensional imaging in non-fluorescent scattering tissues. However, sample motion remains a critical barrier to raster-scanned acquisition and reconstruction of wide-field anatomically accurate volumetric datasets. We introduce spectrally encoded coherence tomography and reflectometry (SECTR), a high-speed multimodality system for simultaneous OCT and spectrally-encoded reflectance (SER) imaging. SECTR utilizes a robust system design consisting of shared optical relays, scanning mirrors, swept-laser, and digitizer to achieve the fastest reported in ...
  Read Full Article
  
  Comment
  
  Mentions: Vanderbilt University Yuankai K. Tao
22. Non-invasive evaluation of Secukinumab efficacy in severe plaque psoriasis with confocal microscopy and optical coherence tomography: A case report
  
  Explore Wiley Online Library Oct 25 2017 Dermatology , Microscopy
  
  Letter to the editor.
  Read Full Article
  
  Comment
23. Microscope-integrated intraoperative optical coherence tomography-guided small-incision lenticule extraction: New surgical technique
  
  Explore Journal of Cataract & Refractive Surgery Oct 1 2017 Microscopy , Ophthalmology
  
  We describe the surgical technique of microscope-integrated intraoperative optical coherence tomography (OCT)-guided small-incision lenticule extraction. The technique enables manual tracking of surgical instruments and identification of the desired dissection plane. It also helps discern the relation between the dissector and the intrastromal lenticule. The dissection plane becomes hyperreflective on dissection, ensuring complete separation of the intrastromal lenticule from the overlying and underlying stroma. Inadvertent posterior plane entry, cap–lenticule adhesion, incomplete separation of the lenticule, creation of a false plane, and lenticule remnants may be recognized intraoperatively so corrective steps can be taken immediately. In cases with a hazy ...
  Read Full Article
  
  Comment
24. Methods and systems for characterizing laser machining properties by measuring keyhole dynamics using interferometry
  
  Explore uspto.gov Sep 12 2017 Microscopy , Patents
  
  A method, apparatus, and system are provided to monitor and characterize the dynamics of a phase change region (PCR) created during laser welding, specifically keyhole welding, and other material modification processes, using low-coherence interferometry. By directing a measurement beam to multiple locations within and overlapping with the PCR, the system, apparatus, and method are used to determine, in real time, spatial and temporal characteristics of the weld such as keyhole depth, length, width, shape and whether the keyhole is unstable, closes or collapses. This information is important in determining the quality and material properties of a completed finished weld. It ...
  Read Full Article
  
  Comment
  
  Mentions: Queen's University Canada
1-24 of 479 1 2 3 4 ... 18 19 20 »