1. Articles from Weston A. Welge

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    1. In vivo endoscopic Doppler optical coherence tomography imaging of the colon

      In vivo endoscopic Doppler optical coherence tomography imaging of the colon

      Background and Objective Colorectal cancer (CRC) remains the second deadliest cancer in the United States. Several screening methods exist; however, detection of small polyps remains a challenge. Optical coherence tomography (OCT) has been demonstrated to be capable of detecting lesions as small as 1 mm in the mouse colon, but detection is based on measuring a doubling of the mucosa thickness. The colon microvasculature may be an attractive biomarker of early tumor development because tumor vessels are characterized by irregular structure and dysfunction. Our goal was to develop an endoscopic method of detecting and segmenting colon vessels using Doppler OCT ...

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    2. Optical coherence tomography imaging of colonic crypts in a mouse model of colorectal cancer

      Optical coherence tomography imaging of colonic crypts in a mouse model of colorectal cancer

      Aberrant crypt foci (ACF) are abnormal epithelial lesions that precede development of colonic polyps. As the earliest morphological change in the development of colorectal cancer, ACF is a highly studied phenomenon. The most common method of imaging ACF is chromoendoscopy using methylene blue as a contrast agent. Narrow- band imaging is a contrast-agent-free modality for imaging the colonic crypts. Optical coherence tomography (OCT) is an attractive alternative to chromoendoscopy and narrow-band imaging because it can resolve the crypt structure at sufficiently high sampling while simultaneously providing depth-resolved data. We imaged in vivo the distal 15 mm of colon in the ...

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    3. In vivo endoscopic Doppler optical coherence tomography imaging of mouse colon

      In vivo endoscopic Doppler optical coherence tomography imaging of mouse colon

      Colorectal cancer remains the second deadliest cancer in the United States, despite the high sensitivity and specificity of colonoscopy and sigmoidoscopy. While these standard imaging procedures can accurately detect medium and large polyps, some studies have shown miss rates up to 25% for polyps less than 5 mm in diameter. An imaging modality capable of detecting small lesions could potentially improve patient outcomes. Optical coherence tomography (OCT) has been shown to be a powerful imaging modality for adenoma detection in a mouse model of colorectal cancer. While previous work has focused on analyzing the structural OCT images based on thickening ...

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    4. Expanding Functionality of Commercial Optical Coherence Tomography Systems by Integrating a Custom Endoscope

      Expanding Functionality of Commercial Optical Coherence Tomography Systems by Integrating a Custom Endoscope

      Optical coherence tomography (OCT) is a useful imaging modality for detecting and monitoring diseases of the gastrointestinal tract and other tubular structures. The non-destructiveness of OCT enables time-serial studies in animal models. While turnkey commercial research OCT systems are plenty, researchers often require custom imaging probes. We describe the integration of a custom endoscope with a commercial swept-source OCT system and generalize this description to any imaging probe and OCT system. A numerical dispersion compensation method is also described. Example images demonstrate that OCT can visualize the mouse colon crypt structure and detect adenoma in vivo .

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    5. In vivo molecular imaging of colorectal cancer using quantum dots targeted to vascular endothelial growth factor receptor 2 and optical coherence tomography/laser-induced fluorescence dual-modality imaging

      In vivo molecular imaging of colorectal cancer using quantum dots targeted to vascular endothelial growth factor receptor 2 and optical coherence tomography/laser-induced fluorescence dual-modality imaging

      Optical coherence tomography/laser induced fluorescence (OCT/LIF) dual-modality imaging allows for minimally invasive, nondestructive endoscopic visualization of colorectal cancer in mice. This technology enables simultaneous longitudinal tracking of morphological (OCT) and biochemical (fluorescence) changes as colorectal cancer develops, compared to current methods of colorectal cancer screening in humans that rely on morphological changes alone. We have shown that QDot655 targeted to vascular endothelial growth factor receptor 2 (QD655-VEGFR2) can be applied to the colon of carcinogen-treated mice and provides significantly increased contrast between the diseased and undiseased tissue with high sensitivity and specificity ex vivo . QD655-VEGFR2 was used in ...

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    6. Diagnostic potential of multimodal imaging of ovarian tissue using optical coherence tomography and second-harmonic generation microscopy

      Diagnostic potential of multimodal imaging of ovarian tissue using optical coherence tomography and second-harmonic generation microscopy

      Ovarian cancer is particularly deadly because it is usually diagnosed after it has metastasized. We have previously identified features of ovarian cancer using optical coherence tomography (OCT) and second-harmonic generation (SHG) microscopy (targeting collagen). OCT provides an image of the ovarian microstructure, while SHG provides a high-resolution map of collagen fiber bundle arrangement. Here, we investigated the diagnostic potential of dual-modality OCT and SHG imaging. We conducted a fully crossed, multireader, multicase study using seven human observers. Each observer classified 44 ex vivo mouse ovaries (16 normal and 28 abnormal) as normal or abnormal from OCT, SHG, and simultaneously viewed ...

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    7. Spiral-scanning, side-viewing optical coherence tomography endoscope for three-dimensional fully sampled in vivo imaging of the mouse colon

      Spiral-scanning, side-viewing optical coherence tomography endoscope for three-dimensional fully sampled in vivo imaging of the mouse colon

      We have previously developed side-viewing endoscopic OCT systems to detect colorectal cancer in the murine model, which longitudinally scans the mouse colon at 8-16 discrete angular positions. This small number of angles is chosen to keep imaging time and the amount of data to analyze reasonable, but this azimuthal undersampling of the tissue may result in missed or incorrectly characterized adenomas. A need exists for a spiral-scanning OCT endoscope capable of generating 3D, in vivo OCT data sets that satisfy the Nyquist criterion for adequate sampling of the tissue. Our new endoscopic system replaces the sample arm optics of a ...

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    1-7 of 7
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  2. Topics in the News

    1. (7 articles) University of Arizona
    2. (7 articles) Jennifer K. Barton
    3. (3 articles) National Institutes of Health
    4. (1 articles) Urs Utzinger
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    6. (1 articles) Massachusetts Eye and Ear Infirmary
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    Spiral-scanning, side-viewing optical coherence tomography endoscope for three-dimensional fully sampled in vivo imaging of the mouse colon Diagnostic potential of multimodal imaging of ovarian tissue using optical coherence tomography and second-harmonic generation microscopy In vivo molecular imaging of colorectal cancer using quantum dots targeted to vascular endothelial growth factor receptor 2 and optical coherence tomography/laser-induced fluorescence dual-modality imaging Expanding Functionality of Commercial Optical Coherence Tomography Systems by Integrating a Custom Endoscope In vivo endoscopic Doppler optical coherence tomography imaging of mouse colon Optical coherence tomography imaging of colonic crypts in a mouse model of colorectal cancer In vivo endoscopic Doppler optical coherence tomography imaging of the colon Three-dimensional detection and quantification of defects in SiC by optical coherence tomography University of Illinois at Chicago Receives NIH Grant for Functional Tomography of Neurovascular Coupling Interactions in Healthy and Diseased Retinas Dyad Medical Receives NIH Grant for Software For OCT Analysis of Vascular Stents Oregon Health and Science University Receives NIH Grant for Application of Ultrahigh-Speed Long-Range Wide-Field OCT in Anterior Eye Diseases Optical coherence tomography and fractional flow reserve guided treatment of woven coronary artery anomaly presenting as acute myocardial infarction