1. Articles from Ryan C. Niemeier

    1-3 of 3
    1. Noise reduction in supercontinuum sources for OCT by single-pulse spectral normalization

      Noise reduction in supercontinuum sources for OCT by single-pulse spectral normalization

      Supercontinuum (SC) sources offer high illumination power from a single-mode fiber with large spectral bandwidth including the visible spectrum, which is a growing application area for optical coherence tomography (OCT). However, SC spectra suffer from pulse-to-pulse variations, increasing noise in the resulting images. By simultaneously collecting a normalization spectrum, OCT image noise can be reduced by more than half (7 dB) for single pulses without any pulse averaging using only simple optical components.

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    2. Platform for quantitative multiscale imaging of tissue composition

      Platform for quantitative multiscale imaging of tissue composition

      Changes in the multi-level physical structure of biological features going from cellular to tissue level composition is a key factor in many major diseases. However, we are only beginning to understand the role of these structural changes because there are few dedicated multiscale imaging platforms with sensitivity at both the cellular and macrostructural spatial scale. A single platform reduces bias and complications from multiple sample preparation methods and can ease image registration. In order to address these needs, we have developed a multiscale imaging system using a range of imaging modalities sensitive to tissue composition: Ultrasound, Second Harmonic Generation Microscopy ...

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    3. Quantifying optical properties with visible and near-infrared optical coherence tomography to visualize esophageal microwave ablation zones

      Quantifying optical properties with visible and near-infrared optical coherence tomography to visualize esophageal microwave ablation zones

      Microwave ablation is a minimally invasive image guided thermal therapy for cancer that can be adapted to endoscope use in the gastrointestinal (GI) tract. Microwave ablation in the GI tract requires precise control over the ablation zone that could be guided by high resolution imaging with quantitative contrast. Optical coherence tomography (OCT) provides ideal imaging resolution and allows for the quantification of tissue scattering properties to characterize ablated tissue. Visible and near-infrared OCT image analysis demonstrated increased scattering coefficients ( μ s ) in ablated versus normal tissues (Vis: 347.8%, NIR: 415.0%) and shows the potential for both wavelength ranges to ...

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    1-3 of 3
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    Quantifying optical properties with visible and near-infrared optical coherence tomography to visualize esophageal microwave ablation zones Platform for quantitative multiscale imaging of tissue composition Noise reduction in supercontinuum sources for OCT by single-pulse spectral normalization Post-Doctoral and Graduate Student Research Positions at the University of Illinois Urbana-Champaign Multiscale correlation of microvascular changes on optical coherence tomography angiography with retinal sensitivity in diabetic retinopathy Macrophage targeted theranostic strategy for accurate detection and rapid stabilization of the inflamed high-risk plaque PERSONALIZED CHARACTERISTICS OF MORPHOMETRIC AND FUNCTIONAL PARAMETERS OF RETINA IN ARTERIAL HYPERTENTION ACCORDING TO OPTICAL COHERENCE TOMOGRAPHY-ANGIOGRAPHY DATA Coherence function-encoded optical palpation Systems, methods, and media for multiple reference arm spectral domain optical coherence tomography Monitoring dissolution of a dosage form in progress during dissolution by low coherence interferometry Two Postdoc Openings at the Physical Optics and Biophotonics Group at Institute of Physical Chemistry, Warsaw, Poland The invasive intracoronary imaging assessment of left main coronary artery disease