1. Articles in category: Gastroenterology

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    1. Are we ready to move toward digital image interpretation in Barrett’s esophagus surveillance?

      Are we ready to move toward digital image interpretation in Barrett’s esophagus surveillance?

      In this issue of Gastrointestinal Endoscopy, Swager et al 1 deal with the issue of a novel technology for Barrett’s esophagus surveillance, reporting the performance of a computer-aided volumetric laser endomicroscopy (VLE) algorithm for early detection of high-grade dysplasia/esophageal adenocarcinoma (HGD/EAC) in Barrett’s esophagus (BE). The authors compared the performance of a computer-aided algorithm versus a clinical algorithm using VLE. Volumetric laser endomicroscopy is a novel advanced imaging technology able to capture esophageal wall images up to 3 mm below the mucosa with a 7-μ resolution in real time. The system consists of a disposable balloon ...

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    2. New Clinical Data Presented at the World Congress of Gastroenterology @ ACG 2017 Shows Increased Dysplasia Detection Using Volumetric Laser Endomicroscopy with Laser Marking

      New Clinical Data Presented at the World Congress of Gastroenterology @ ACG 2017 Shows Increased Dysplasia Detection Using Volumetric Laser Endomicroscopy with Laser Marking

      NinePoint Medical, Inc., a transformative medical device company pioneering the use of Optical Coherence Tomography (OCT) for gastrointestinal applications, today announced exciting new clinical data which was presented at the Plenary session at the World Congress of Gastroenterology @ the ACG 2017 in Orlando, FL. This data highlights clinical results achieved using the NvisionVLE ® Imaging System with Real-time Targeting™ - NinePoint Medical’s groundbreaking technology enabling Volumetric Laser Endomicroscopy (VLE) scanning of the esophagus and subsequent laser marking of concerning regions for pathological examination. Dr. Arvind Trindade and his colleagues from the Northwell Health System studied 369 consecutive patients that received endoscopic ...

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    3. Visibility of Fiducial Markers used for Image-Guided Radiation Therapy on Optical Coherence Tomography for Registration with CT: an Esophageal Phantom Study

      Visibility of Fiducial Markers used for Image-Guided Radiation Therapy on Optical Coherence Tomography for Registration with CT: an Esophageal Phantom Study

      Purpose Optical coherence tomography (OCT) is of interest to visualize microscopic esophageal tumor extensions to improve tumor delineation for radiation therapy (RT) planning. Fiducial marker placement is a common method to ensure target localization during planning and treatment. Visualization of these fiducial markers on OCT permits integrating OCT and computed tomography (CT) images used for RT planning via image registration. We studied the visibility of 13 (8 types) commercially available solid and liquid fiducial markers in OCT images at different depths using dedicated esophageal phantoms and evaluated marker placement depth in clinical practice. Materials and Methods We designed and fabricated ...

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    4. NinePoint Medical is featuring the NvisionVLE® Imaging System with Real-time Targeting™ at ACG 2017; Eight Scientific Abstracts to be Presented

      NinePoint Medical is featuring the NvisionVLE® Imaging System with Real-time Targeting™ at ACG 2017; Eight Scientific Abstracts to be Presented

      Visit us at ACG 2017! Booth #825 NinePoint Medical is featuring the NvisionVLE ® Imaging System with Real-time Targeting™ at ACG 2017; Eight Scientific Abstracts to be Presented NinePoint Medical, Inc., a transformative medical device company pioneering the use of an advanced imaging platform for gastrointestinal applications, today announced that new clinical data relating to its proprietary NvisionVLE ® Imaging System with Real-time Targeting™ will be presented at two upcoming major conferences. Seven clinical abstracts will be featured at the World Congress of Gastroenterology @ the ACG 2017 conference taking place October 13-18 in Orlando, FL, and one poster session will be presented ...

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    5. Computer-aided detection of early Barrett’s neoplasia using volumetric laser endomicroscopy

      Computer-aided detection of early Barrett’s neoplasia using volumetric laser endomicroscopy

      Background and Aims Volumetric laser endomicroscopy (VLE) is an advanced imaging system that provides a near-microscopic resolution scan of the esophageal wall layers up to 3-mm deep. VLE has the potential to improve detection of early neoplasia in Barrett’s esophagus (BE). However, interpretation of VLE images is complex because of the large amount of data that need to be interpreted in real time. The aim of this study was to investigate the feasibility of a computer algorithm to identify early BE neoplasia on ex vivo VLE images. Methods We used 60 VLE images from a database of high-quality ex ...

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    6. A new aim for targeted biopsies in Barrett’s esophagus

      A new aim for targeted biopsies in Barrett’s esophagus

      Patients with Barrett's esophagus (BE) are at an increased risk for the development of esophageal adenocarcinoma. This risk is relatively low in patients with nondysplastic BE (∼0.1%-0.3% per year) but much higher in patients with BE and high-grade dysplasia (∼6% per year). Several gastroenterology societies recommend interval surveillance for patients with nondysplastic BE, whereas endoscopic eradication therapy is reserved for patients with BE and associated dysplasia or early neoplasia. 1 , 2 , 3 The accurate detection of dysplasia associated with BE is therefore instrumental to the management of this disease. The established surveillance biopsy protocol consists of ...

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    7. Performance characteristics of optical coherence tomography in assessment of Barrett's esophagus and esophageal cancer: systematic review

      Performance characteristics of optical coherence tomography in assessment of Barrett's esophagus and esophageal cancer: systematic review

      Optical coherence tomography (OCT) can generate high-resolution images of the esophagus that allows cross-sectional visualization of esophageal wall layers. We conducted a systematic review to assess the utility of OCT for diagnosing of esophageal intestinal metaplasia (IM; Barrett's esophagus BE)), dysplasia, cancer and staging of early esophageal cancer. English language human observational studies and clinical trials published in PubMed and Embase were included if they assessed any of the following: (i) in-vivo features and accuracy of OCT at diagnosing esophageal IM, sub-squamous intestinal metaplasia (SSIM), dysplasia, or cancer, and (ii) accuracy of OCT in staging esophageal cancer. Twenty-one of ...

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    8. Endoscopic optical coherence tomography with a focus-adjustable probe

      Endoscopic optical coherence tomography with a focus-adjustable probe

      We present a focus-adjustable endoscopic probe for optical coherence tomography (OCT), which is able to acquire images with different focal planes and overcome depth-of-focus limitations by image fusing. The use of a two-way shape-memory-alloy spring enables the probe to adjust working distance over 1.5 mm, providing a large scanning range with high resolution and no sensitivity loss. Equipped with a homemade hollow-core ultrasonic motor, the probe is capable of performing an unobstructed 360 deg field-of-view distal scanning. Both the axial resolution and the best lateral resolution are ∼ 4    μm ∼4  μm , with a sensitivity of 100.3 dB. Spectral-domain ...

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    9. Endoscopic forward-viewing optical coherence tomography and angiography with MHz swept source

      Endoscopic forward-viewing optical coherence tomography and angiography with MHz swept source

      Endoscopic optical coherence tomography (OCT) instruments are mostly side viewing and rely on at least one proximal scan, thus limiting accuracy of volumetric imaging and en face visualization. Previous forward-viewing OCT devices had limited axial scan speeds. We report a forward-viewing fiber scanning 3D-OCT probe with 900 μm field of view and 5 μm transverse resolution, imaging at 1 MHz axial scan rate in the human gastrointestinal tract. The probe is 3.3 mm diameter and 20 mm rigid length, thus enabling passage through the endoscopic channel. The scanner has 1.8 kHz resonant frequency, and each volumetric acquisition takes ...

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    10. Endomicroscopic optical coherence tomography for cellular resolution imaging of gastrointestinal tracts

      Endomicroscopic optical coherence tomography for cellular resolution imaging of gastrointestinal tracts

      Our ability to detect neoplastic changes in gastrointestinal (GI) tracts is limited by the lack of an endomicroscopic imaging tool that provides cellular-level structural details of GI mucosa over a large tissue area. In this paper, we report a fiber-optic based micro-optical coherence tomography (μOCT) system and demonstrate its capability to acquire cellular-level details of GI tissue through circumferential scanning. The system achieves an axial resolution of 2.48 µm in air and a transverse resolution of 4.8 µm with a depth-of-focus (DOF) of ~150 µm. To mitigate the issue of limited DOF, we used a rigid sheath to ...

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    11. Assessment of the radiofrequency ablation dynamics of esophageal tissue with optical coherence tomography

      Assessment of the radiofrequency ablation dynamics of esophageal tissue with optical coherence tomography

      Radiofrequency ablation (RFA) is widely used for the eradication of dysplasia and the treatment of early stage esophageal carcinoma in patients with Barrett’s esophagus (BE). However, there are several factors, such as variation of BE epithelium (EP) thickness among individual patients and varying RFA catheter-tissue contact, which may compromise RFA efficacy. We used a high-speed optical coherence tomography (OCT) system to identify and monitor changes in the esophageal tissue architecture from RFA. Two different OCT imaging/RFA application protocols were performed using an ex vivo swine esophagus model: (1) post-RFA volumetric OCT imaging for quantitative analysis of the coagulum ...

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    12. Cholangioport for optical coherence tomography imaging and photodynamic therapy of the cholangiocarcinoma

      Cholangioport for optical coherence tomography imaging and photodynamic therapy of the cholangiocarcinoma

      Introduction: Optical Coherence Tomography (OCT) is technology which can be used as criteria efficiency of Photodynamic Therapy (PDT) for cholangiocarcinoma. The prognosis of patients with cholangiocarcinomas is very poor and the first symptom is mechanical jaundice. The percutaneous transhepatic drainage is used in the first stage of treatment. It seemed to be an attractive idea to deliver light directly through the drainage. For doing that it was necessary to determine the possibility of tumor radiation by the semiconductor laser through the catheter wall. Methods: The aim of the first stage of research was to estimate the optimum transmission spectra and ...

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    13. Beth Israel Deaconess Medical Center Receives NIH Grant for In Vivo Optical Detection of Dysplasia in Esophagus

      Beth Israel Deaconess Medical Center Receives  NIH Grant for In Vivo Optical Detection of Dysplasia in Esophagus

      Beth Israel Deaconess Medical Center Receives a 2017 NIH Grant for $598,587 for In Vivo Optical Detection of Dysplasia in Esophagus. The principal investigator is Lev Perelman. The program began in 2005 and ends in 2020. Below is a summary of the proposed work. Esophageal adenocarcinoma is the most common esophageal malignancy in Western world and the malignancy that is rising the fastest in the United States – approximately 7% per year over the past 30 years. It has very poor prognosis with less than 15% of patients alive 5 years after diagnosis. Worldwide, 482,300 new esophageal cancer cases ...

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    14. PhD Student Position in integration of a micromachined endomicroscope for OCT imaging in gastroenterology

      PhD Student Position in integration of a micromachined endomicroscope for OCT imaging in gastroenterology

      The FEMTO-ST Institute (CNRS unit), associated with the Université de Bourgogne et Franche-Comté , announces the opening of a PhD position in integration of a miniature endomicroscope based on MOEMS/microoptical technologies for OCT imaging in gastroenterology. This position can start in October 2017. FEMTO-ST is one of 3 largest research institutes in France in the field of Engineering Sciences, having about 730 employees including more than 150 doctoral students. FEMTO-ST facilities offer the full access to a world-class cleanroom facility (class 10/100). The host team is focusing on MEMS and microoptics. FEMTO-ST received funding from the French government by ...

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    15. New Endoscope to Enable Faster, More Accurate Colorectal Cancer Diagnosis

      New Endoscope to Enable Faster, More Accurate Colorectal Cancer Diagnosis

      Researchers at Tyndall National Institute at UCC are taking part in a new European project to develop a low cost, easy to use 3D imaging system that will help enable faster and more accurate diagnosis of colorectal cancers. The Optical Coherence Tomography (OCT) system is being developed by Tyndall as part of the recently launched PICCOLO project, an EU Horizon 2020 funded initiative, bringing together scientists and clinicians across Europe to create an endoscope probe to better diagnose bowel polyps and early colon cancer. Tyndall researcher, Dr. Brendan Roycroft explains: “ Using breakthrough photonics, (the generation, manipulation and utilisation of light ...

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    16. Piccolo project develops endoscope for colon cancer diagnosis

      Piccolo project develops endoscope for colon cancer diagnosis

      New instrument from Horizon 2020 project will use OCT and MPT for high-resolution imaging. Piccolo project: the European consortium A project funded under the EU Horizon 2020 program aims to develop a novel endoscope for the identification and diagnosis of colorectal cancer, the latest step in the use of optical technologies to tackle one of the world's predominant cancers. Running for three years until December 2019, and involving nine European industrial and research partners led by Spain's Tecnalia Research & Innovation research center, the Piccolo project envisages an advanced endoscope instrument able to deliver high-resolution structural and functional imaging ...

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    17. Massachusetts Institute of Technology Receives NIH Grant for Optical Biopsy Using Optical Coherence Tomography

      Massachusetts Institute of Technology Receives  NIH Grant for Optical Biopsy Using Optical Coherence Tomography

      Massachusetts Institute of Technology Receives a 2017 NIH Grant for $259,717 for Optical Biopsy Using Optical Coherence Tomography. The principal investigator is James Fujimoto. The program began in 1997 and ends in 2019. Below is a summary of the proposed work. This is a multidisciplinary collaboration between investigators at the Massachusetts Institute of Technology and the VA Boston Healthcare System integrating imaging technology research, clinical imaging studies, medical device development and animal imaging studies. Esophageal cancer is a lethal malignancy, with a five-year survival rate of 16%. Barrett's esophagus (BE) and dysplasia are precursors to esophageal adenocarcinoma (EAC ...

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    18. NinePoint Medical to Feature the NvisionVLE® Imaging System with Real-time Targeting™ at DDW 2017; Twenty-four Scientific Abstracts to be Presented

      NinePoint Medical to Feature the NvisionVLE® Imaging System with Real-time Targeting™ at DDW 2017; Twenty-four Scientific Abstracts to be Presented

      – NinePoint Medical, Inc., a transformative medical device company pioneering the use of advanced Optical Coherence Tomography (OCT) for gastrointestinal applications, will be featuring the NvisionVLE® Imaging System with Real-time Targeting™ at Digestive Disease Week® (DDW) 2017, which will be held May 6-9 in Chicago. In addition, results from various studies utilizing this technology in gastroenterology will be presented in 24 scientific abstracts throughout the conference. Random biopsy is the current standard of care for diagnosing esophageal diseases such as Barrett’s esophagus, squamous cell carcinoma, and adenocarcinoma. However, random biopsies assess less than 3% of the esophageal surface1 , leaving more ...

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    19. Imaging system, method and distal attachment for multidirectional field of view endoscopy

      Imaging system, method and distal attachment for multidirectional field of view endoscopy

      An exemplary apparatus for imaging at least one anatomical structure can be provided. For example, the apparatus can include an endoscopic first arrangement, a radiation source second arrangement which provides at least one electro-magnetic radiation, and a third arrangement attached to at least one portion of the endoscopic arrangement. The third arrangement can contain an optical arrangement which, upon impact by the at least one electro-magnetic radiation and based thereon, may transmit a first radiation and reflects a second radiation. The first radiation can impact at least one first portion of the anatomical structure(s), and the second radiation can ...

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    20. Volumetric laser endomicroscopy in the management of Barrett's esophagus

      Volumetric laser endomicroscopy in the management of Barrett's esophagus

      Purpose of review: The incidence of esophageal adenocarcinoma is on the rise despite widespread appreciation that the precursor lesion is Barrett's esophagus. Studies have shown that some patients known to have Barrett's esophagus develop cancer despite their enrollment in conventional endoscopic surveillance programs. This highlights the need for advanced endoscopic imaging to help identify early neoplasia and prevent its progression to esophageal cancer. Recently, a wide-field, second-generation optical coherence tomography endoscopic platform called volumetric laser endomicroscopy (VLE) was cleared by the Food and Drug Administration and made commercially available for advanced imaging in Barrett's esophagus. Recent findings ...

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    21. Endoscopic optical coherence tomography: technologies and clinical applications [Invited]

      Endoscopic optical coherence tomography: technologies and clinical applications [Invited]

      In this paper, we review the current state of technology development and clinical applications of endoscopic optical coherence tomography (OCT). Key design and engineering considerations are discussed for most OCT endoscopes, including side-viewing and forward-viewing probes, along with different scanning mechanisms (proximal-scanning versus distal-scanning). Multi-modal endoscopes that integrate OCT with other imaging modalities are also discussed. The review of clinical applications of endoscopic OCT focuses heavily on diagnosis of diseases and guidance of interventions. Representative applications in several organ systems are presented, such as in the cardiovascular, digestive, respiratory, and reproductive systems. A brief outlook of the field of endoscopic ...

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    22. Dynamically focused optical coherence tomography for endoscopic applications

      Dynamically focused optical coherence tomography for endoscopic applications

      We report a demonstration of a small liquid-filled polymer lens that may be used to dynamically provide scanning depth focus for endoscopic optical coherence tomography (OCT) applications. The focal depth of the lens is controlled by changing the hydraulic pressure within the lens, enabling dynamic focal depth control without the need for articulated parts. The 1 mm diameter lens is shown to have resolving power of 5 μm, and can enable depth scans of 2.5 mm, making it suitable for use with OCT-enabled optical biopsy applications.

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    23. €4m project to speed diagnosis of esophageal cancer

      €4m project to speed diagnosis of esophageal cancer

      The Institute of Biological and Medical Imaging at Helmholtz Zentrum München , Germany, is heading a research project entitled ”Hybrid optical and optoacoustic endoscope for esophageal tracking” or ESOTRAC . This four-year, €4 million, pan-European project will bring together engineers and physicians to develop a novel hybrid endoscopic instrument for early diagnosis and staging of esophageal cancer. The finished device is expected to reduce the number of unnecessary biopsies and, importantly, facilitate early-disease detection leading to earlier start of therapy, which will improve therapeutic efficacy over late-disease treatment and, ultimately, cost-savings for health care systems. ESOTRAC was awarded the €4 million ...

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    24. Easier diagnosis of esophageal cancer

      Easier diagnosis of esophageal cancer

      The Institute of Biological and Medical Imaging at Helmholtz Zentrum München is heading the "Hybrid optical and optoacoustic endoscope for esophageal tracking" (ESOTRAC) research project, in which engineers and physicians together develop a novel hybrid endoscopic instrument for early diagnosis and staging of esophageal cancer. The device may reduce the number of unnecessary biopsies and, importantly, facilitate early-disease detection leading to earlier start of therapy, which improves therapeutic efficacy over late-disease treatment and leads to immense cost-savings for the health care system. ESOTRAC has been awarded four million Euros from Horizon 2020, the EU framework program for research and ...

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    1-24 of 550 1 2 3 4 ... 21 22 23 »
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