Sökning: "Computer tomography"

Visar resultat 21 - 25 av 67 uppsatser innehållade orden Computer tomography.

  1. 21. Segmentation of People and Vehicles in Dense Voxel Grids from Photon Counting LiDAR using 3D-Unet

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Fredrik Danielsson; [2021]
    Nyckelord :Deep Learning; LiDAR; Segmentation; Dense Voxel Grids; Single Photon Counting; Machine Learning; 3D U-Net; Convolutional Neural Network;

    Sammanfattning : In recent years, the usage of 3D deep learning techniques has seen a surge,mainly driven by advancements in autonomous driving and medical applications.This thesis investigates the applicability of existing state-of-the-art 3Ddeep learning network architectures to dense voxel grids from single photoncounting 3D LiDAR. LÄS MER

  3. 22. Paper fibre characterization and quantification - Automated skeletonisation and characterization for fibre deformation analysis in x-ray tomography

    Master-uppsats, KTH/Hållfasthetslära

    Författare :Ívar Sveinsson; [2021]
    Nyckelord :Paper fibre; fiber; characterization; x-ray tomography; deformation;

    Sammanfattning : With the advent of X-ray computerised tomography (CT), the possibility of capturing precise volumetric 3D images has become an invaluable tool within the material sciences. With tomographs and synchrotrons becoming more readily available to researchers and scanning time decreasing with newer equipment, the amount of data to be analysed is steadily rising. LÄS MER

  4. 23. Evaluation of two CNN models, VGGNet-16 & VGGNet-19, for classification of Alzheimer’s disease in brain MRI scans

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Tim Jonsson; Isabella Tapper; [2020]
    Nyckelord :;

    Sammanfattning : Computer-aided-diagnosis (CAD) emerged in the early 1950s and since then CAD has facilitated the diagnosing of many medical conditions and diseases. In particular, CADfor Alzheimer’s disease (AD) has been immensely researched the last decade thanks to advanced neuroimaging techniques such as magnetic resonance imaging (MRI) and positron emission tomography (PET). LÄS MER

  5. 24. X-ray imaging of water flow through soil

    Master-uppsats, SLU/Dept. of Soil and Environment

    Författare :Lorenzo Garbari; [2020]
    Nyckelord :infiltration; tomography; soil structure; soil porosity; wetting front; x-ray;

    Sammanfattning : In this study a laboratory experiment on preferential flow was conducted with the aim to quantify the importance of water repellency, soil structure and irrigation rate on water infiltration into soil. To do so, the study was conducted as follows: (a) comparison between the wetting fronts of the irrigations done on the same sample; (b) the tortuosity of the wetting fronts, this was analysed calculating a tortuosity index; (c) the average infiltration velocity and (d) a visual comparison between the 3D images. LÄS MER

  7. 25. Risker med joniserande strålning med fokus på barn samt unga vuxna vid datortomografiundersökningar : En litteraturöversikt

    Kandidat-uppsats, Luleå tekniska universitet/Institutionen för hälsovetenskap

    Författare :Mahsa Ebrahimi; Nooriya Mohammadi; [2020]
    Nyckelord :Children; Computer tomography; Ionizing radiation; Radiation dose; Radiation injuries; Risks; Barn; Datortomografi; Joniserande strålning; Risker; Stråldos; Strålningsskador;

    Sammanfattning : Antalet datortomografiundersökningar (DT) ökar i Sverige och hela världen. En nackdel med denna undersökning är höga stråldoser som kan orsaka stokastiska skador (cancer) på patienter. Mest strålkänsliga patienter är barn. LÄS MER