Sökning: "Cone beam CT"

Visar resultat 1 - 5 av 24 uppsatser innehållade orden Cone beam CT.

1. 1. Evaluation of a Novel Reconstruction Framework for Gamma Knife Cone-Beam CT - The Impact of Scatter Correction and Noise Filtering on Image Quality and Co-registration Accuracy

   Master-uppsats, KTH/Fysik

   Författare :Ida Hägnestrand; [2023]
   Nyckelord :Gamma Knife; Cone-beam computed tomography; Image quality; Image reconstruction; Co-registration; Contrast; Uniformity; Spatial resolution; Scatter correction; Wiener filter; Noise filter; Patient positioning; Stereotactic radiosurgery; Gammakniv; Strålkniv; Cone-Beam Computed Tomography; Bildkvalitet; Bildrekonstruktion; Co-registrering; Kontrast; Uniformitet; Spatial upplösning; Spridningskorrigering; Wienerfilter; Brusfilter; Stereotaktisk strålkirurgi;

   Sammanfattning : The Gamma Knife is a non-invasive stereotactic radiosurgery system used for treatments of deep targets in the brain. Accurate patient positioning is needed for precise radiation delivery to the target. LÄS MER

3. 2. 3d-utskrivet fantom för kontroll av linjär-acceleratorer

   Uppsats för yrkesexamina på grundnivå, Umeå universitet/Institutionen för tillämpad fysik och elektronik; Umeå universitet/Centrum för medicinsk teknik och fysik (CMTF)

   Författare :Simon Selin; [2023]
   Nyckelord :3D; print; phantom; quality control; linear accelerator; artefacts; 3D-utskrift; fantom; kvalitetskontroll; linjäracceleratorer; artefakter;

   Sammanfattning : Cancer är en sjukdom som var tredje person får som diagnos under en livstid. Stor del av dessa cancerpatienter får behandling med hjälp av strålbehandling. Där strålbehandlingen kan ske med en linjäraccelerator. Linjäracceleratorn producerar elektron eller fotonstrålning i Mega Volt energiområde. LÄS MER

4. 3. 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

5. 4. Evaluation of the iterative kilovoltage cone-beam computed tomography reconstruction method for the Varian TrueBeam system

   Master-uppsats,

   Författare :Tamana Haidari; [2022-03-18]
   Nyckelord :Medical physics; FDK algorithm; iterative algorithm; CBCT; image quality;

   Sammanfattning : Introduction: Radiotherapy is used to treat patients with various types of cancer, where linear accelerators produce the radiation beam used for the treatment. Before each treatment fraction, the patient needs to be correctly positioned according to the treatment plan. LÄS MER

7. 5. Imaging of the MTP joint: Developing an imaging protocol optimised for damage detection and 3D modelling

   Master-uppsats, KTH/Fysik

   Författare :Johanna Jacobsson; [2022]
   Nyckelord :computed tomography; magnetic resonance imaging; cone beam computedtomography; cartilage; osteochondral lesions; metatarsal phalangeal joint; datortomografi; magnetisk resonanstomografi; kon-datortomografi; brosk; kondrala skador; metatarsalphalangen-leden;

   Sammanfattning : Walking without pain in the toe has a significant impact on a person’s well-being. Human mobility will be impaired in osteoarthritis of the big toe, and pain will occur during walking. By replacing the cartilage or bone injury with an individualised implant, osteochondral injuries to the knee and ankle can be treated. LÄS MER