Essays about: "positron"

Showing result 1 - 5 of 67 essays containing the word positron.

  1. 1. Total body perfusion imaging with 15O-water PET

    University essay from Umeå universitet/Institutionen för fysik

    Author : Anna Åhlström; [2023]
    Keywords : ;

    Abstract : Background Positron emission tomography scanners can be used together with the PET tracer 15O-water to image perfusion in the body. It has mainly been used to image perfusion in the brain and heart. The new total-body PET scanners have a larger axial field-of-view, making imaging of the whole body possible without moving the patient. READ MORE

  3. 2. Visualizing osteonecrosis of jaws through neutrophil elastase : [11C]NES novel PET tracer

    University essay from Uppsala universitet/Institutionen för läkemedelskemi

    Author : Amanda Dannberg; Theodora Martinez; [2023]
    Keywords : [11C]NES; HNC; MRONJ; neutrophil granulocytes; ORN; osteonecrosis; PET CT; radiation therapy; [11C]NES; huvud- och halscancer; MRONJ; neutrofila granulocyter; ORN; osteonekros; PET CT; strålbehandling;

    Abstract : Radiation and medical drugs are used to fight head and neck cancer, but unfortunately in some cases these treatments cause development of other diseases and injuries. Osteoradionecrosis (ORN) and medical-related osteonecrosis of the jaw (MRONJ) are dreaded late complications in jaws from radiation therapy and medical drugs and cause great suffering to those affected. READ MORE

  4. 3. Respiratory Motion Correction in PET Imaging: Comparative Analysis of External Device and Data-driven Gating Approaches

    University essay from KTH/Fysik

    Author : Nina Lindström Söraas; [2023]
    Keywords : PET CT; Tomographic reconstruction; Respiratory gating techniques; Image registration; Motion correction; PET CT; Tomografisk rekonstruktion; Gating tekniker; Bildregistrering; Rörelsekorrigering;

    Abstract : Positron Emission Tomography (PET) is pivotal in medical imaging but is prone to artifactsfrom physiological movements, notably respiration. These motion artifacts both degradeimage quality and compromise precise attenuation correction. READ MORE

  5. 4. Long-Lived Particles from exotic Higgs decays at the FCC-ee

    University essay from Uppsala universitet/Högenergifysik

    Author : Magdalena Vande Voorde; [2023]
    Keywords : ;

    Abstract : This thesis presents the first sensitivity analysis for exotic Higgs boson decays at the electron-positron stage of the Future Circular Collider (FCC-ee) within the FCCAnalyses framework. The project studies the production of a Higgs boson in association with a Z boson in electron-positron collisions at a center-of-mass energy of 240 GeV, with the Higgs boson decaying into two long-lived scalars and the Z boson decaying leptonically. READ MORE

  6. 5. Effects of reconstruction parameters on the image quality and quantification of PET images from PET/MRI and PET/CT systems

    University essay from

    Author : Ali Amena Hussain; [2022-03-09]
    Keywords : Medical physics; PET CT; PET MRI; OSEM; BPL; NEMA IQ; positron emission tomography; magnetic resonance imaging; computed tomography; ordered Subset Expectation Maximization; The Bayesian Penalized Likelihood;

    Abstract : Aim: To study how reconstruction parameters affect the positron emission tomography (PET) image quality and quantitative results for the different lesion to background radioactivity ratios in three different PET systems. Introduction: Multimodality imaging that combines magnetic resonance imaging (MRI) or computed tomography (CT) with a PET system can produce medical images containing both functional and anatomical information. READ MORE