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Browsing by Author "Gnesin, S."

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  • Cardiac PET/CT with Rb-82: optimization of image acquisition and reconstruction parameters
    Publication . Chilra, P.; Gnesin, S.; Allenbach, G.; Monteiro, M.; Prior, J. O.; Vieira, Lina; Pires Jorge, J. A.
    Our aim was to characterize the influence of time-of-flight (TOF) and point spread function (PSF) recovery corrections, as well as ordered subset expectation maximization (OSEM) reconstruction parameters, in (82)Rb PET/CT quantification of myocardial blood flow (MBF) and myocardial flow reserve (MFR). Rest and stress list-mode dynamic (82)Rb PET acquisition data from 10 patients without myocardial flow defects and 10 patients with myocardial blood flow defects were reconstructed retrospectively. OSEM reconstructions were performed with Gaussian filters of 4, 6, and 8 mm, different iterations, and subset numbers (2 × 24; 2 × 16; 3 × 16; 4 × 16). Rest and stress global, regional, and segmental MBF and MFR were computed from time activity curves with FlowQuant(©) software. Left ventricular segmentation using the 17-segment American Heart Association model was obtained.
    2017-02Journal article Open access Show more
  • Research practice development for nuclear medicine technologists: an innovative experience
    Publication . Chilra, P.; Gnesin, S.; Allenbach, G.; Prior, J. O.; Marques, C.; Masias-Valdés, C.; Descombes, F.; Vieira, Lina; Jorge, José
    Introduction - European nuclear medicine technologist’s education is delivered by Higher Education Institutions and students obtain a grade of Bachelor of Sciences (BSc), during which they are initiated to research during their studies. Once BSc nuclear medicine technologists are in professional practice, they have very few opportunities to develop a real research experience and they rather become passive users than active contributors the growth of scientific knowledge in nuclear medicine. Aim - To describe and discuss an innovative educational and professional experience aimed in strengthen research knowledge, skills and competencies of former nuclear medicine technologists student in the context of an international mobility stay.
    2014-10Conference object Open access Show more