Sökning: "Hounsfield unit"

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

  1. 1. Uncertainties in the use of synthetic CT (sCT) for daily online adaptive radiotherapy for lung cancer

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Johansson Vivika; [2023]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Background and purpose: Cone Beam Computed Tomography (CBCT) based online adaptive radiotherapy (oART) has been clinically implemented for several anatomical sites worldwide. However, random and abrupt anatomical changes with large density alterations can occur in lung patients, leading to uncertainties with synthetic computed tomography (sCT) and dose calculation. LÄS MER

  3. 2. 3D printer in dosimetry and mammography – designing and testing an OSL dosemeter holder and a low contrast-detail phantom

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Måns Boll; [2022]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Introduction: Today, 3D printing is a versatile tool used in a wide range of fields. With the advent of more cost-effective fused deposition modelling (FDM) 3D printing technologies it is time to investi- gate what such a 3D printer has to offer in radiation science applications. LÄS MER

  4. 3. Preparations for photon external beam radiotherapy treatment planning of small animals

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Joanie Diha Guei; [2022]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Introduction:The XenX is a small animal irradiation system that acquires high-resolution cone-beam tomography (CBCT) images of small animals and treats small animals with higher precision than medical linear accelerators. MuriSlice is a software for CBCT image reconstruction. LÄS MER

  5. 4. 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

  7. 5. Utvärdering av en metod för mätning av kroppsfett hos katt med helkropps datortomografi

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

    Författare :Frida Zetterström; [2017]
    Nyckelord :kroppsfett; datortomografi; katt; fetma; kroppsvikt;

    Sammanfattning : SAMMANFATTNING Förekomsten av fetma hos våra katter är idag ett ökande problem och ett flertal hälsoproblem associeras med tillståndet. En reproducerbar och objektiv metod för mätning av kroppsfett är värdefullt i undersökningar om hur fetma kan ge upphov till hälsoproblem, t ex vid vilken grad av fetma detta sker och om lokalisationen av fettvävnaden har någon betydelse. LÄS MER