Sökning: "MRI"

Visar resultat 1 - 5 av 313 uppsatser innehållade ordet MRI.

  1. 1. Magnetkameraundersökningar av gravida kvinnor och foster - Potentiella risker för fostret

    Kandidat-uppsats,

    Författare :Linda Clausen; Victoria Lundblad; [2021-06-08]
    Nyckelord :Magnetkamera; graviditet; foster; riskfaktorer; gadolinium;

    Sammanfattning : Bakgrund: Magnetresonanstomografi (MR) har blivit en viktig modalitet inom den radiologiska verksamheten. MR anses vara en säker diagnostisk metod att använda sig av på gravida kvinnor, dock är forskningen alldeles för begränsad inom MR-säkerhet gällande gravida kvinnor vilket inte gör det svårt att påstå att undersökningen är helt riskfri för kvinnan och fostret. LÄS MER

  2. 2. DEFORMABLE IMAGE REGISTRATION OF SPINE MAGNETIC RESONANCE IMAGES WITH ELASTIX FOR DETAILED CHARACTERIZATION OF DISC LOADING BEHAVIORS

    Master-uppsats,

    Författare :Zainab Sirat; [2021-05-10]
    Nyckelord :Medical physics; Registration; MRI; Spine;

    Sammanfattning : Purpose: This work aimed to develop an optimized strategy for registration of spine magnetic resonance (MR) images acquired with and without spinal loading, as well as evaluate the quality of the registration strategy with commonly used quality assessment methods. Method: Previously collected MR images of the lumbar spine of 37 individuals were re analyzed. LÄS MER

  3. 3. The value of cardiac MRI texture analysis in patients with clinically suspected myocarditis

    Master-uppsats,

    Författare :Evin Ina Papalini; [2021-05-10]
    Nyckelord :Medical physics; Myocarditis; Cardiac magnetic resonance; Texture analysis;

    Sammanfattning : Purpose: The aim of this proof-of-concept study was to assess the diagnostic value of texture analysis (TA) based on conventional balanced steady-state-free precession (bSSFP), late gadolinium enhancement (LGE) and T2-weighted cardiac magnetic resonance imaging (CMRI) in patients with clinically suspected myocarditis.Method: A retrospective cohort study was performed based on 30 patients whounderwent a comprehensive CMRI due to clinically suspected myocarditisbetween 2013 and 2018 at the Sahlgrenska University Hospital: 10 patients with clinical signs and positive myocardial biomarkers (Troponin T, indicating myocardial injury) as well as positive CMRI findings according to Lake Louise Criteria (LLC; group 1), 10 patients with clinical signs and positive myocardial biomarkers but negative CMRI findings according to LLC (group 2), and 10 patients with clinical signs but both negative myocardial biomarkers as well as CMRI findings according to LLC (control group). LÄS MER

  4. 4. Deep Learning with Importance Sampling for Brain Tumor MR Segmentation

    Master-uppsats, KTH/Optimeringslära och systemteori

    Författare :Hanna Westermark; [2021]
    Nyckelord :Deep learning; importance sampling; segmentation; convolutional neural networks; MRI; brain tumour; Djupinlärning; importance sampling; segmentering; faltningsnätverk; MRI; hjärntumör;

    Sammanfattning : Segmentation of magnetic resonance images is an important part of planning radiotherapy treat-ments for patients with brain tumours but due to the number of images contained within a scan and the level of detail required, manual segmentation is a time consuming task. Convolutional neural networks have been proposed as tools for automated segmentation and shown promising results. LÄS MER

  5. 5. 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