Sökning: "Hounsfield units"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden Hounsfield units.

  1. 1. Development and evaluation of an inter-subject image registration method for body composition analysis for three slice CT images

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för informationsteknologi

    Författare :Hugo Dahlberg; [2022]
    Nyckelord :Medical imaging; Image registration; SCAPIS;

    Sammanfattning : Over 30 000 liver, abdomen, and thigh slices have been acquired by computed tomography for the SCAPIS and IGT study. To utilise the full potential of the large cohort and enable statistical pixel-wise body composition analysis and visualisation of associations with other biomarkers, a point-to-point correspondence between the scans is needed. LÄS MER

  3. 2. Beräkning av bendensitet och benvolym vid datortomografisk helkroppsundersökning av katt : jämförelse av två metoder för beräkning samt inverkan av storlek, ålder, kön och osteoartrit

    Uppsats för yrkesexamina på avancerad nivå, SLU/Dept. of Clinical Sciences

    Författare :Stefan Lindén; [2020]
    Nyckelord :katt; bendensitet; benvolym; datortomografi; benvolym; ålder; kön; storlek; felin osteoartrit;

    Sammanfattning : Bone volume and bone density may be affected by disease. Measurement of bone volume and bone density in cats could possibly be used as a tool in diagnosing osteoarthritis (OA), lameness and other diseases expected to affect bone density and bone volume. Measurement of bone volume is also useful when evaluating body composition. LÄS MER

  4. 3. Practical implementation and exploration of dual energy computed tomography methods for Hounsfield units to stopping power ratio conversion

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Medicinsk strålningsvetenskap

    Författare :David Kennbäck; [2018]
    Nyckelord :computed tomography; CT; dual energy; DECT; dual energy computed tomography; dual energy CT; HU; SPR; Skandion; Skandionkliniken; Hounsfield; Hounsfield unit; Stopping power ratio;

    Sammanfattning : The purpose of this project was to explore the performance of methods for estimating stopping power ratio (SPR) from Hounsfield units (HU) using dual energy CT scans, rather than the standard single energy CT scans, with the aim of finding a method which could outperform the current single energy stoichiometric method. Such a method could reduce the margin currently added to the target volume during treatment which is defined as 3. LÄS MER

  5. 4. Dosimetric verification of synthetic CT using Cone Beam CT in an MRI only workflow

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Emilia Palmér; [2017]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Background and purpose: The MRI only workflow aims to base the treatment planning solely on magnetic resonance imaging (MRI), hence excluding the traditional computed tomography (CT) scan. To do that synthetic computed tomography (sCT) data is generated, replacing the conventional CT data. LÄS MER

  7. 5. System for dose audit for external radiation therapy based on EPR dosimetry with Lithium Formate

    Master-uppsats, Fysikum

    Författare :Zelga Malke; [2010]
    Nyckelord :Dose; audit;

    Sammanfattning : Radiation therapy is an important method to treat cancer with the aim to deliver as high doses as reasonably achievable to the tumor while protecting the surrounding healthy tissue and organs at risk, OARs. Therefore, it is essential to have high accuracy in the dose delivered clinically and quality assurances are required. LÄS MER