Microscopy -Optical Coherence Tomography News

Articles in category: Microscopy

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1. Vectorial birefringence imaging by optical coherence microscopy for assessing fibrillar microstructures in the cornea and limbus
  
  Explore OSA | OSA Publishing Jan 25 2020 Microscopy
  
  The organization of fibrillar tissue on the micrometer scale carries direct implications for health and disease but remains difficult to assess in vivo . Polarization-sensitive optical coherence tomography measures birefringence, which relates to the microscopic arrangement of fibrillar tissue components. Here, we demonstrate a critical improvement in leveraging this contrast mechanism by employing the improved spatial resolution of focus-extended optical coherence microscopy (1.4 µm axially in air and 1.6 µm laterally, over more than 70 µm depth of field). Vectorial birefringence imaging of sheep cornea ex vivo reveals its lamellar organization into thin sections with distinct local optic axis ...
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  Mentions: Massachusetts General Hospital Harvard University David D. Sampson
2. Computed optical coherence microscopy of mouse brain ex vivo
  
  Explore SPIE Digital Library Dec 1 2019 Microscopy , Neurology
  
  The compromise between lateral resolution and usable imaging depth range is a bottleneck for optical coherence tomography (OCT). Existing solutions for optical coherence microscopy (OCM) suffer from either large data size and long acquisition time or a nonideal point spread function. We present volumetric OCM of mouse brain ex vivo with a large depth coverage by leveraging computational adaptive optics (CAO) to significantly reduce the number of OCM volumes that need to be acquired with a Gaussian beam focused at different depths. We demonstrate volumetric reconstruction of ex-vivo mouse brain with lateral resolution of 2.2 μm, axial resolution of ...
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  Mentions: Cornell University Steven G. Adie
3. Microscope having an optical coherence tomography device
  
  Explore uspto.gov Nov 12 2019 Microscopy , Patents
  
  A microscope having an observation beam path including a main objective, an OCT device including a first detection beam path, a wavefront measuring device including a second detection beam path, a first, a second and a third optics group is provided, wherein the first detection beam path contains the main objective and the first to third optics group, and the first to third optics group forms an afocal imaging optical unit of the first detection beam path and the second detection beam path contains the main objective, the first optics group and the second optics group, and the main objective ...
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  Mentions: Carl Zeiss Meditec
4. Combination of 2D Compressive Sensing Spectral Domain Optical Coherence Tomography and Interferometric Synthetic Aperture Microscopy
  
  Explore MDPI Open Access Journals Platform Sep 25 2019 Microscopy
  
  Combining the advantages of compressive sensing spectral domain optical coherence tomography (CS-SDOCT) and interferometric synthetic aperture microscopy (ISAM) in terms of data volume, imaging speed, and lateral resolution, we demonstrated how compressive sampling and ISAM can be simultaneously used to reconstruct an optical coherence tomography (OCT) image. Specifically, an OCT image is reconstructed from two-dimensional (2D) under-sampled spectral data dimension-by-dimension through a CS reconstruction algorithm. During the iterative process of CS algorithm, the deterioration of lateral resolution beyond the depth of focus (DOF) of a Gaussian beam is corrected. In the end, with less spectral data, we can obtain an ...
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  Mentions: Tsinghua University
5. VIS-OCT offers sight line
  
  Explore Photonics.com Sep 19 2019 Microscopy , Ophthalmology
  
  The benefits of optical coherence tomography (OCT) have long been known as an imaging tool in ophthalmology, enabling the examination of the eye at microscopic resolution. But what may not be widely appreciated is that the use of visible light sources can improve upon the results of this well-developed technique in the detection and understanding of various eye-related diseases such as macular degeneration and glaucoma. While most commercial OCT and OCTA (angiography) systems use NIR light for economic and technical reasons, broadband visible light sources have expanded from 400 to 2000 nm or more. This has enabled the imaging of ...
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  Mentions: Northwestern University Hao F. Zhang Opticent Health
6. IMAGING TECHNIQUE FROM BECKMAN LAB NAMED TOP 10 MICROSCOPY INNOVATION
  
  Explore beckman.illinois.edu Aug 21 2019 Microscopy
  
  n imaging technique developed at the Biophotonics Imaging Laboratory at the Beckman Institute was named one of the 10 best microscopy innovations of 2019 by Microscopy Today, the official magazine of the Microscopy Society of America. Dr. Stephen Boppart, a professor of bioengineering and of electrical and computer engineering Simultaneous label-free autofluorescence multi-harmonic (SLAM) microscopy is a new imaging technology developed by senior research scientist Haohua Tu, bioengineering graduate student Sixian You, and a team of researchers at the Biophotonics Imaging Laboratory, led by Dr. Stephen Boppart, a professor of bioengineering and of electrical and computer engineering at Illinois, and ...
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  Mentions: Stephen A. Boppart University of Illinois at Urbana-Champaign Haohua Tu
7. Ophthalmic operation microscope
  
  Explore uspto.gov Aug 20 2019 Microscopy , Ophthalmology , Patents
  
  In an ophthalmic operation microscope, an illumination optical system illuminates a patient's eye with illumination light. An observation optical system is used for observing the patient's eye illuminated. An objective lens is disposed in an observation optical path. An interference optical system splits light from a light source into measurement light and reference light, and detects interference light generated from returning light of the measurement light from the patient's eye and the reference light. A first lens group is disposed between the light source and the patient's eye in an optical path of the measurement light ...
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  Mentions: Topcon Medical Systems
8. In vivo corneal confocal microscopy aided by optical coherence tomography
  
  Explore OSA | OSA Publishing Apr 26 2019 Microscopy , Ophthalmology
  
  In vivo corneal confocal microscopy and its operability in scientific as well as in clinical applications is often impaired by the lack of information on imaging plane position and orientation inside the cornea during patient’s examination. To overcome this hurdle, we have developed a novel corneal imaging system based on a commercial scanning device and a modified Rostock Cornea Module. The presented preliminary system produces en face images by confocal laser scanning microscopy and sagittal cross-section images by optical coherence tomography simultaneously. This enables imaging guidance during examinations, improved features for diagnostics along with thickness measurements of the cornea ...
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  Mentions: Universität Rostock
9. En face optical coherence tomography: a technology review [Invited]
  
  Explore OSA | OSA Publishing Apr 9 2019 Microscopy
  
  A review on the technological development of en face optical coherence tomography (OCT) and optical coherence microscopy (OCM) is provided. The terminology originally referred to time domain OCT, where the preferential scanning was performed in the en face plane. Potentially the fastest realization of en face image recording is full-field OCT, where the full en face plane is illuminated and recorded simultaneously. The term has nowadays been adopted for high-speed Fourier domain approaches, where the en face image is reconstructed from full 3D volumes either by direct slicing or through axial projection in post processing. The success of modern en ...
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  Mentions: Rainer A. Leitgeb Medical University of Vienna
10. Stereoscopic display systems and methods for displaying surgical data and information in a surgical microscope
  
  Explore uspto.gov Mar 26 2019 Microscopy , Patents
  
  Stereoscopic display systems and methods for displaying surgical data and information in a surgical microscope are disclosed herein. According to an aspect, a system includes first and second eyepieces. The system includes a display having first and second display portions, configured to display first images in the first display portion, and configured to display second images in the second display portion. The first image and the second image are projected along a first pathway and a second pathway. The system includes a first optical element positioned to relay the first images into the first eyepiece. The system includes a second ...
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  Mentions: Joseph A. Izatt Duke University Cynthia A. Toth
11. Optical coherence tomography microscopy apparatus and method for detecting a three-dimensional image of an object
  
  Explore uspto.gov Feb 26 2019 Microscopy , Patents
  
  An optical coherence tomography microscopy apparatus (1) is presented for detecting a three-dimensional image of an optically translucent or reflective sample object (OS), the apparatus comprising an interferometric optical setup including a photo sensor unit (20). A sense signal Si from the photo sensor unit (20) is detected using a detection reference signal. The detection reference signal is derived from a signal indicative for a relative displacement of the sample object (OS) with respect to a reference object.
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12. 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 ...
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13. 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 ...
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  Mentions: Carl Zeiss Meditec
14. 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 ...
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  Mentions: Manabu Sato Yamagata University
15. 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.
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16. 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 ...
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  Mentions: Guillermo J. Tearney Massachusetts General Hospital Harvard University
17. 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 ...
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  Mentions: University of Waterloo Singapore Eye Research Institute Kostadinka K. Bizheva
18. 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 ...
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  Mentions: University of Sheffield Steven J. Matcher
19. 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 ...
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  Mentions: Lehigh University Chao Zhou
20. 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.
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  Mentions: Northwestern University
21. 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 ...
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22. 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 ...
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  Mentions: Cornell University Steven G. Adie
23. 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 ...
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  Mentions: Canon Medical Systems
24. 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 ...
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  Mentions: Thorlabs Alex E. Cable James Y. Jiang
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