Sökning: "Speckle imaging"

Visar resultat 1 - 5 av 14 uppsatser innehållade orden Speckle imaging.

  1. 1. Real-time Autofocus Algorithm in Laser Speckle Contrast Imaging

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Giovanni Russo; [2023]
    Nyckelord :Laser speckle contrast imaging; Autofocus; Blind image sharpness assessment; Speckle noise; Perimed’s Perfusion Speckle Imager;

    Sammanfattning : Microcirculation is defined as the blood flow in the smallest blood vessels. Laser speckle contrast imaging (LSCI) is a full field imaging technique that provides instantaneous 2-D perfusion maps of illuminated tissues based on speckle contrast. LÄS MER

  3. 2. Speckle suppression in ultrasound images of heterogeneous materials

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Simon Johnsson; [2023]
    Nyckelord :Ultrasound; non-destructive testing; wiener filter; signal processing;

    Sammanfattning : Performing non-destructive testing (NDT) on materials is a helpful tool for maintenance and quality control because the materials are not destroyed or disturbed; ultrasound imaging is one type of NDT. Ultrasound imaging of heterogeneous materials contains many echoes from the material itself. LÄS MER

  4. 3. Detection of local motion artifacts and image background in laser speckle contrast imaging

    Master-uppsats, Linköpings universitet/Institutionen för medicinsk teknik

    Författare :Johannes Nyhlén; Märta Sund; [2023]
    Nyckelord :laser speckle contrast imaging; lsci; multi exposure laser speckle contrast imaging; melsci; machine learning; deep learning; statistical analysis; detection; local motion artifacts; 1D; 2D; 3D;

    Sammanfattning : Laser speckle contrast imaging (LSCI) and its extension, multi-exposure laser speckle contrast imaging (MELSCI) are non-invasive techniques to monitor peripheral blood perfusion. One of the main drawbacks of LSCI and MELSCI in clinical use is that the techniques are sensitive to tissue movement. LÄS MER

  5. 4. Quantification and Detection of Motion Artifacts in Laser Speckle Contrast Imaging

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Dennis Amphan; [2022]
    Nyckelord :Laser speckle contrast imaging; Image registration; Motion artifacts; Detection;

    Sammanfattning : Laser speckle contrast imaging (LSCI) is a non-invasive method for assessment of microcirculatory blood flow. The technique is based on analysis of speckle patterns to build 2D maps of perfusion with high spatial and temporal resolution. LÄS MER

  7. 5. Semantic segmentation using convolutional neural networks to facilitate motion tracking of feet : For real-time analysis of perioperative microcirculation images in patients with critical limb thretening ischemia

    Master-uppsats, Linköpings universitet/Avdelningen för medicinsk teknik

    Författare :Andreas Öberg; Martin Hulterström; [2021]
    Nyckelord :semantic segmentation; convolutional neural network; critical limb threatening ischemia; ROI tracking; deep learning;

    Sammanfattning : This thesis investigates the use of Convolutional Neural Networks (CNNs) toperform semantic segmentation of feet during endovascular surgery in patientswith Critical Limb Threatening Ischemia (CLTI). It is currently being investigatedwhether objective assessment of perfusion can aid surgeons during endovascularsurgery. LÄS MER