title: Differences in polar-map patterns using the novel technologies for myocardial perfusion imaging.
abstract: New technologies are available in MPI. Our aim was to evaluate their impact on the uniformity of normal myocardial uptake in the polar-map representation, over different count statistics, with and without the attenuation (AC) and scatter corrections (SC).
  
  
  
  A phantom study was performed using 5 Anger gamma cameras with filtered back projection or iterative reconstruction with resolution recovery (IRR), with or without SCAC; a D530c, with or without AC; and a D-SPECT. Count statistics ranged up to a quarter of the reference for the conventional gamma cameras and up to one half for the advanced scanners. Using polar maps, the segmental uptakes and their uncertainties, the 'global uniformity' of polar maps expressed as the coefficient of variation (COV) among the segmental uptakes and the anterior/inferior (ANT/INF) ratio were calculated.
  
  
  
  Both segmental uptakes and their uncertainties did not depend on the count statistics in the range studied. An increase in the segmental uptakes was found from IRR to IRR + SCAC (78.0% ± 13.5% vs 86.1% ± 9.4%; P < .0001). COV was lower for D-SPECT (10.1% ± 0.5%) and after SCAC for both conventional (9.9% ± 3.0%) and advanced systems (8.9% ± 1.7%). The ANT/INF ratio was above 1 for IRR (1.12 ± 0.07) and fell slightly below 1 for IRR + SCAC (0.97 ± 0.05).
  
  
  
  To compare data from the analysis of polar maps across different systems will require the adoption of specific normality databases, developed for each system and reconstruction method employed.
authors.affiliation: Unit of Nuclear Medicine and Department of Cardiology, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy.
authors.forename: Orazio
authors.initials: O
authors.lastname: Zoccarato
authors.affiliation: Unit of Nuclear Medicine and Department of Cardiology, S. Maugeri Foundation, IRCCS, Scientific Institute of Veruno, Veruno, NO, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Marcassa
authors.affiliation: Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy.
authors.forename: Domenico
authors.initials: D
authors.lastname: Lizio
authors.affiliation: Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy.
authors.forename: Lucia
authors.initials: L
authors.lastname: Leva
authors.affiliation: Department of Health Sciences, University of Milan and Nuclear Medicine Unit, ASST Santi Paolo e Carlo, Milan, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Lucignani
authors.affiliation: Nuclear Medicine Department, IRCCS San Raffaele Hospital, Milan, Italy.
authors.forename: Annarita
authors.initials: A
authors.lastname: Savi
authors.affiliation: Department of Health Sciences, University of Milan and Nuclear Medicine Unit, ASST Santi Paolo e Carlo, Milan, Italy.
authors.forename: Camilla
authors.initials: C
authors.lastname: Scabbio
authors.affiliation: Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy.
authors.forename: Roberta
authors.initials: R
authors.lastname: Matheoud
authors.affiliation: Department of Health Sciences, University of Milan and Nuclear Medicine Unit, ASST Santi Paolo e Carlo, Milan, Italy.
authors.forename: Michela
authors.initials: M
authors.lastname: Lecchi
authors.affiliation: Departments of Medical Physics and Nuclear Medicine, University Hospital 'Maggiore della Carità', Novara, Italy. marco.brambilla@maggioreosp.novara.it.|Medical Physics Department, University Hospital of Novara, Novara, Italy. marco.brambilla@maggioreosp.novara.it.
authors.forename: Marco
authors.initials: M
authors.lastname: Brambilla
mesh_terms: D000465:Algorithms; D000886:Anthropometry; D015902:Gamma Cameras; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D055414:Myocardial Perfusion Imaging / Q000379:methods* / Q000639:trends*; D009206:Myocardium / Q000473:pathology; D019047:Phantoms, Imaging; D011877:Radionuclide Imaging; D012984:Software; D015899:Tomography, Emission-Computed, Single-Photon
keywords: SPECT; cadmium-zinc-telluride; cardiac