1. Featured Articles

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    1. Perimeter Medical Imaging Closes Oversubscribed $5 Million Series A Financing Round Led By Roadmap Capital

      Perimeter Medical Imaging Closes Oversubscribed $5 Million Series A Financing Round Led By Roadmap Capital

      Perimeter Medical Imaging, Inc., a developer of real time imaging systems for in-surgery tissue assessment, is pleased to announce the closing of their $5 million Series A financing. The round was led by Roadmap Capital with participation from EPIC Capital, NorthView Ventures and Pathfinder Asset Management. Funds will support the completion of their current clinical study at Princess Margaret Cancer Centre as well as product development and FDA regulatory clearance for their first tissue imaging product. Perimeter’s ground-breaking new Optical Tissue Imaging System (OTIS™) is an intraoperative medical imaging tool that provides clinicians with the ability to visualize the ...

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    2. Wideband Electrically Pumped 1050-nm MEMS-Tunable VCSEL for Ophthalmic Imaging

      Wideband Electrically Pumped 1050-nm MEMS-Tunable VCSEL for Ophthalmic Imaging

      In this paper, we present a 1050-nm electrically pumped microelectromechanically tunable vertical cavity surface emitting laser (MEMS-VCSEL) with a record dynamic tuning bandwidth of 63.8 nm, suitable for swept-source optical coherence tomography (SS-OCT) imaging. These devices provide reduced cost and complexity relative to previously demonstrated optically pumped devices by obviating the need for a pump laser and associated hardware. We demonstrate ophthalmic SS-OCT imaging with the electrically-pumped MEMS-VCSEL at a 400 kHz axial scan rate for wide-field imaging of the in vivo human retina over a 12 mm × 12 mm field and for OCT angiography of the macula over ...

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    3. Recent advances in clinical application of optical coherence tomography of human skin

      Recent advances in clinical application of optical coherence tomography of human skin

      Optical coherence tomography (OCT) is an emerging noninvasive imaging method that uses infrared light and interferometric techniques. The method has become increasingly popular in skin research as well as daily dermatology practice. In the present brief review, we focused on recent (2009–2014) OCT studies on the human skin, which included a reasonable sample size and statistics. Twenty-five papers were selected and briefly described OCT of epidermal thickness, skin appendages, wound healing, extracellular matrix and skin fibrosis, vascular malformations, and skin tumors such as basal cell carcinoma, actinic keratoses, and malignant melanoma

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      Mentions: Thilo Gambichler
    4. Serving unmet needs with OCT Webcast with Dr. Mark Brezinski

      Serving unmet needs with OCT Webcast with Dr. Mark Brezinski

      To view this webcast click HERE . This webcast was originally broadcast on July 16, 2015 and is now available for on demand viewing. What Steve Jobs referred to as “the unmet need” is a barrier to effective treatment, scientific discovery—and equipment sales. Traditionally, developers (engineers) strive for precision, elegance, and maximum theoretical performance (e.g. resolution), whereas the end user (physician or researcher) often has very different requirements. Unfortunately, efforts to bridge this gap can easily become confused. In this webcast, biophotonics pioneer Mark Brezinski MD explores unmet needs in biomedicine, using examples in OCT to illustrate how developers ...

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    5. Utility of Optical Coherence Tomography Imaging with Angiographic Co-registration for the Guidance of Percutaneous Coronary Intervention

      Utility of Optical Coherence Tomography Imaging with Angiographic Co-registration for the Guidance of Percutaneous Coronary Intervention

      Intracoronary optical coherence tomography (OCT) is a light-based imaging modality able to visualise with high resolution (~10 μm) the vascular morphology and the acute and chronic effects of intervention with intracoronary devices. 1,2 OCT could therefore find application in the guidance of percutaneous coronary intervention (PCI), allowing a thorough preprocedural lesion assessment, which enables accurate device sizing, selection of the vessel segment requiring treatment, and, thus, efficient planning of the implantation strategy (see Table 1 ). 3 Moreover, it can be used for the assessment of the acute procedural result, allowing the estimation of stent expansion and vessel injury. Consequently ...

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    6. A Micromotor Catheter for Intravascular Optical Coherence Tomography

      A Micromotor Catheter for Intravascular Optical Coherence Tomography

      We have developed a new form of intravascular optical coherence tomography (IV-OCT) that allows the extremely fast acquisition of high-resolution images of the coronary arteries. This process leads to much better image quality by eliminating cardiac motion artefacts and undersampling. It relies on a catheter that incorporates a synchronous micromotor with a diameter of 1.0 mm and a rotational speed of up to 5600 revolutions per second, enabling an IV-OCT frame rate of 5.6 kHz. This speed is matched by a wavelength-swept laser that generates up to 2.8 million image lines per second. With this setup, our ...

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    7. Prostate cancer diagnosis: the feasibility of needle-based optical coherence tomography

      Prostate cancer diagnosis: the feasibility of needle-based optical coherence tomography

      The objective of this study is to demonstrate the feasibility of needle-based optical coherence tomography (OCT) and functional analysis of OCT data along the full pullback trajectory of the OCT measurement in the prostate, correlated with pathology. OCT images were recorded using a commercially available C7-XR™ OCT Intravascular Imaging System interfaced to a C7 Dragonfly™ intravascular 0.9-mm-diameter imaging probe. A computer program was constructed for automated image attenuation analysis. First, calibration of the OCT system for both the point spread function and the system roll-off was achieved by measurement of the OCT signal attenuation from an extremely weakly scattering ...

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    8. Finding a needle in a haystack: use of volumetric laser endomicroscopy in targeting focal dysplasia in long-segment Barrett’s esophagus

      Finding a needle in a haystack: use of volumetric laser endomicroscopy in targeting focal dysplasia in long-segment Barrett’s esophagus

      A 64-year-old man underwent esophagoscopy 15 months earlier, which diagnosed long-segment Barrett’s esophagus. Examination of random biopsy specimens yielded a diagnosis of intestinal metaplasia, with 1 biopsy specimen as indefinite for dysplasia. Two subsequent esophagoscopies were performed 6 months apart, and random biopsy specimens were negative for dysplasia. The patient was referred for volumetric laser endomicroscopy (VLE) (NVisionVLE, NinePoint Medical, Cambridge, Mass). At esophagoscopy, high-definition white-light endoscopy showed a 7-cm segment of flat salmon-colored mucosa (Prague class C6M7) ( A ).

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    9. Catheter-based intraluminal optical coherence tomography: mcomparison with digital light microscopy of ureter wall morphometry in porcine specimens

      Catheter-based intraluminal optical coherence tomography: mcomparison with digital light microscopy of ureter wall morphometry in porcine specimens

      OBJECTIVE: Reproducibility and agreement of width estimates for urothelium, lamina propria, and muscle layer of normal porcine ureter wall ex vivo were compared between catheter-mounted, intraluminal cross-sectional optical coherence tomography (OCT), as a new destruction-free optical imaging method that could be applied clinically to examine the upper urinary tract from within if found to reliably delineate its different anatomical layers, and whole-mount low-power digital light microscopy (DLM). MATERIALS AND METHODS: Eleven ex-vivo-specimens of porcine ureter were flushed with normal saline solution prior to OCT (catheter diameter, 0.014 inch, wavelength, 1300 ± 20 nm, LightLab Imaging, Inc., Westford, MA, USA) at ...

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      Mentions: St. Jude Medical
    10. Incidence and Clinical Significance of Post-Stent OCT Findings: One Year Follow-Up Study From a Multicenter Registry

      Incidence and Clinical Significance of Post-Stent OCT Findings: One Year Follow-Up Study From a Multicenter Registry

      Background —Optical coherence tomography (OCT) was recently introduced to optimize percutaneous coronary intervention. However, the exact incidence and significance of post-stent OCT findings are unknown. Methods and Results —A total of 900 lesions treated with 1001 stents in 786 patients who had post-procedure OCT imaging were analyzed to evaluate the incidence of post-stent OCT findings and to identify the OCT predictors for device-oriented clinical endpoints (DoCE), including cardiac death, target vessel-related myocardial infarction, target lesion revascularization (TLR) and stent thrombosis. Patients were followed up to 1 year. Stent edge dissection was detected in 28.7% of lesions and incomplete stent ...

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    11. Serving Unmet Needs with Optical Coherence Tomography WebCast with Dr. Mark Brezinski

      Serving Unmet Needs with Optical Coherence Tomography WebCast with Dr. Mark Brezinski

      What Steve Jobs referred to as “the unmet need” is a barrier to effective treatment, scientific discovery—and equipment sales. Traditionally, developers (engineers) strive for precision, elegance, and maximum theoretical performance (e.g. resolution), whereas the end user (physician or researcher) often has very different requirements. Unfortunately, efforts to bridge this gap can easily become confused. In this webcast, biophotonics pioneer Mark Brezinski MD explores unmet needs in biomedicine, using examples in OCT to illustrate how developers and end users can effectively collaborate. You'll come away with a better understanding of actual clinical needs, how biophotonics developers can fulfill ...

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    12. Impact of Side Branch Modeling on Computation of Endothelial Shear Stress in Coronary Artery Disease Coronary Tree Reconstruction by Fusion of 3D Angiography and OCT

      Impact of Side Branch Modeling on Computation of Endothelial Shear Stress in Coronary Artery Disease Coronary Tree Reconstruction by Fusion of 3D Angiography and OCT

      Background Computational fluid dynamics allow virtual evaluation of coronary physiology and shear stress (SS). Most studies hitherto assumed the vessel as a single conduit without accounting for the flow through side branches. Objectives This study sought to develop a new approach to reconstruct coronary geometry that also computes outgoing flow through side branches in hemodynamic and biomechanical calculations, using fusion of optical coherence tomography (OCT) and 3-dimensional (3D) angiography. Methods Twenty-one patients enrolled in the DOCTOR (Does Optical Coherence Tomography Optimize Revascularization) fusion study underwent OCT and 3D-angiography of the target vessel (9 left anterior descending, 2 left circumflex, 10 ...

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    13. Postdoctoral Positions in Biomedical Optics and Optical Coherence Tomography at the Center for Ophthalmic Optics & Lasers, Oregon Health & Science University

      Postdoctoral Positions in Biomedical Optics and Optical Coherence Tomography at the Center for Ophthalmic Optics & Lasers, Oregon Health & Science University

      Postdoctoral research opportunities are available in the area of biomedical optics at the Center for Ophthalmic Optics & Lasers ( www.COOLLab.net ) in the Casey Eye Institute, Oregon Health & Science University (OHSU). The COOL laboratory is a multidisciplinary team that incorporates optical scientists, image processing experts, ophthalmologists, statisticians, managers, and technicians. The group collaborates with several institutions to develop novel OCT technology, develop diagnostic and surgical planning software, and conduct clinical trials. The laboratory is well supported by the National Institutes of Health ( http://www.octnews.org/articles/2920025/optical-coherence-tomography-used-500m-of-federall/ ) and industry, and has brought many novel diagnostic technology into clinical ...

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    14. Investigation of optical coherence micro-elastography as a method to visualize cancers in human breast tissue

      Investigation of optical coherence micro-elastography as a method to visualize cancers in human breast tissue

      Accurate intraoperative identification of malignant tissue is a challenge in the surgical management of breast cancer. Imaging techniques that help address this challenge could contribute to more complete and accurate tumor excision, and thereby help reduce the current high re-excision rates without resorting to the removal of excess healthy tissue. Optical coherence micro-elastography (OCME) is a three-dimensional, high-resolution imaging technique that is sensitive to micro-scale variations of the mechanical properties of tissue. As tumor modifies the mechanical properties of breast tissue, OCME has the potential to identify, on the micro-scale, involved regions of fresh, unstained tissue. OCME is based on ...

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    15. Detection of buried Barrett’s glands after radiofrequency ablation with volumetric laser endomicroscopy

      Detection of buried Barrett’s glands after radiofrequency ablation with volumetric laser endomicroscopy

      Background and Aims The prevalence and clinical relevance of buried Barrett’s glands (BB) after radiofrequency ablation (RFA) in Barrett’s esophagus (BE) are debated. Recent optical coherence tomography studies demonstrated a high prevalence of BBs. Direct histological correlation, however, has been lacking. Volumetric laser endomicroscopy (VLE) is a second-generation optical coherence tomography system capable of scanning a large surface of the esophageal wall layers with low-power microscopy resolution. The aim was to evaluate whether post-RFA subsquamous glandular structures (SGSs), detected with VLE, actually correspond to BBs by pursuing direct histological correlation with VLE images. Methods In vivo VLE was ...

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    16. St. Jude Medical Announces Launch of the First International Trial to Compare OCT-Guided Stent Implantation to IVUS or Angiography-Guided PCI

      St. Jude Medical Announces Launch of the First International Trial to Compare OCT-Guided Stent Implantation to IVUS or Angiography-Guided PCI

      St. Jude Medical, Inc. (NYSE:STJ), a global medical device company, today announced the launch of the ILUMIEN III clinical trial, a prospective, international, randomized trial evaluating the clinical benefits of the company’s optical coherence tomography (OCT) guidance during stent implantation. The ILUMIEN III study will compare OCT-guided stent implantation to implantation guided by intravascular ultrasound (IVUS) or angiography alone, diagnostic tools that offer less resolution than OCT during intravascular assessments and percutaneous coronary intervention (PCI). The ILUMIEN III study is the largest multicenter randomized study to date to compare PCI outcomes associated with all three imaging tools. By ...

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    17. Optovue Introduces AngioVue OCTA in Glaucoma

      Optovue Introduces AngioVue OCTA in Glaucoma

      Optovue, a pioneer in optical coherence tomography angiography (OCTA) and leader in commercialization of the technology, announced that it has expanded the application of its OCT Angiography technology into glaucoma. After a successful introduction of the revolutionary AngioVue Imaging System to retina last year, Optovue has worked to develop clinical applications in glaucoma as well.

      The use of the AngioVue Imaging System in glaucoma was introduced at a highly successful symposium at the 6th World Glaucoma Congress in Hong Kong. The Optovue-hosted event featured presentations on the clinical applications of OCTA in glaucoma research using the company's AngioVue OCTA ...

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    18. High-resolution three-dimensional in vivo imaging of mouse oviduct using optical coherence tomography

      High-resolution three-dimensional in vivo imaging of mouse oviduct using optical coherence tomography

      The understanding of the reproductive events and the molecular mechanisms regulating fertility and infertility in humans relies heavily on the analysis of the corresponding phenotypes in mouse models. While molecular genetic approaches provide significant insight into the molecular regulation of these processes, the lack of live imaging methods that allow for detailed visualization of the mouse reproductive organs limits our investigations of dynamic events taking place during the ovulation, the fertilization and the pre-implantation stages of embryonic development. Here we introduce an in vivo three-dimensional imaging approach for visualizing the mouse oviduct and reproductive events with micro-scale spatial resolution using ...

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    19. Computational high-resolution optical imaging of the living human retina

      Computational high-resolution optical imaging of the living human retina

      High-resolution in vivo imaging is of great importance for the fields of biology and medicine. The introduction of hardware-based adaptive optics (HAO) has pushed the limits of optical imaging, enabling high-resolution near diffraction-limited imaging of previously unresolvable structures 1 , 2 . In ophthalmology, when combined with optical coherence tomography, HAO has enabled a detailed three-dimensional visualization of photoreceptor distributions 3 , 4 and individual nerve fibre bundles 5 in the living human retina. However, the introduction of HAO hardware and supporting software adds considerable complexity and cost to an imaging system, limiting the number of researchers and medical professionals who could benefit ...

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    20. Optical Coherence Tomography: Technology and Applications Second Edition (Textbook)

      Optical Coherence Tomography: Technology and Applications Second Edition (Textbook)

      New medical imaging technologies can improve the diagnosis and clinical management of many diseases. Furthermore, advanced imaging also contributes to a better understanding of pathogenesis and therefore to the development of new pharmaceuticals and novel therapies. Thus, imaging plays a critical role in modern medical research and clinical practice. Noninvasive or minimally invasive imaging techniques have revolutionized diagnostic medicine during the last decades, e.g., X-ray computed tomography (CT), magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), radioisotope imaging (position emission tomography (PET)), single-photon emission computed tomography (SPECT), and diffuse optical tomography (DOT). These techniques permit three-dimensional visualization; however ...

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    21. Barrett's Esophagus: Advanced Imaging Options For Early Cancer Detection

      Barrett's Esophagus: Advanced Imaging Options For Early Cancer Detection

      This Video describes the basic approach to endoscopic inspection of Barrett's esophagus. It Focuses on new imaging technologies that increase our ability to detect precancerous or cancerous changes and thus allow us to better target treatment to these areas. For more information on Barrett's Esophagus, visit: http://www.mayoclinic.org/diseases-co...

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