Essays about: "ordered Subset Expectation Maximization"

Found 3 essays containing the words ordered Subset Expectation Maximization.

  1. 1. 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

  3. 2. Volume calculation of the thyroid gland from SPECT images based on Monte Carlo simulations

    University essay from Umeå universitet/Radiofysik; Umeå universitet/Institutionen för fysik

    Author : Niklas Palmqvist; [2018]
    Keywords : nuclear medicine xeleris thyroid hyperthyroidism thyrotoxicosis monte carlo technetium iodine;

    Abstract : In this study the volume determination which is a part of the doseplanning for patients with thyrotoxicosis was investigated. The aim was to find an accurate method to determine the active volume with single photon emission tomography (SPECT) which in several studies have shown better results than with the currently used method planar scintigraphy (PS). READ MORE

  4. 3. Characterization and Reduction of Noise in PET Data Using MVW-PCA

    University essay from Institutionen för informationsteknologi

    Author : Per-Edvin Svensson; [2009]
    Keywords : ;

    Abstract : Masked Volume-Wise Principal Component Analysis (MVW-PCA) is used in Positron Emission Tomography (PET) to distinguish structures with different kinetic behaviours of an administered tracer. In the article where MVW-PCA was introduced, a noise pre-normalization was suggested due to temporal and spatial variations of the noise between slices. READ MORE