Sökning: "examensarbete mri"

Visar resultat 1 - 5 av 21 uppsatser innehållade orden examensarbete mri.

  1. 1. Reduction of Noise and Artefacts in MRIScan of Metal Implant Reconstructed by Frequency Mapping

    Master-uppsats, Lunds universitet/Avdelningen för Biomedicinsk teknik

    Författare :Pontus Wahlqvist; [2022]
    Nyckelord :Technology and Engineering;

    Sammanfattning : Metal objects can cause significant artefacts in magnetic resonance imaging (MRI) scans, cause loss of signal and what is known as geometric warping. There are ways to address these problems using different MRI sequences. This project looks at a newer method of artefact correction proposed by Månsson and Morin. LÄS MER

  3. 2. Polymer gel dosimetry - Using MRI-readout, simplified relatively non-toxic mixing procedure tested on FLASH

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Maria Blomstedt; [2022]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Background: One of the polymer gel dosimeters available today is the N-isopropylamide (NIPAM) polymer gel dosimeter which has a less toxic monomer compared to other polymer gels and the advantage of being able to be manufactured under normal oxygen levels. Polymer gel dosimeters in general are advantageous independent dosimeters to use for verification of new radiation treatment techniques due to its favorable qualities such as very high resolution, 3D coverage, tissue equivalence and independence of energy and incident direction of the radiation beam. LÄS MER

  4. 3. Pre-planning of Individualized Ankle Implants Based on Computed Tomography - Automated Segmentation and Optimization of Acquisition Parameters

    Master-uppsats, KTH/Fysik

    Författare :Matilda Engström Messén; Elvira Moser; [2021]
    Nyckelord :osteochondral lesions of the talus; computed tomography; U-net; convolutional neural network; dice coefficient; fotled; ledbrosk; osteochondral lesion of the talus; datortomografi; U-net; convolutional neuralt nätverk; dicekoefficient;

    Sammanfattning : The structure of the ankle joint complex creates an ideal balance between mobility and stability, which enables gait. If a lesion emerges in the ankle joint complex, the anatomical structure is altered, which may disturb mobility and stability and cause intense pain. LÄS MER

  5. 4. Multimodal Brain Age Estimation

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

    Författare :Oscar Danielsson; [2020]
    Nyckelord :;

    Sammanfattning : Machine learning models trained on MRI brain scans of healthy subjects can be used to predict age. Accurate estimation of brain age is important for reliably detecting abnormal aging in the brain. One way to increase the accuracy of predicted brain age is through using multimodal data. LÄS MER

  7. 5. Characterization of Radiomics Features Extracted from Images Generated by the 0.35 T Scanner of an Integrated MRI-Linac

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Rebecka Ericsson Szecsenyi; [2020]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Purpose: In an era of personalized oncology where the aim is to give every patient the right treatment at the right time an area of promising research is emerging called radiomics, or quantitative image analysis. The main underlying hypothesis is that pathophysiological information can be found in image texture not visible to the bare eye that can improve diagnosis, treatment adaption or be linked to a certain clinical outcome. LÄS MER