title: [Calculation of the left ventricular ejection fraction. Comparison between 4 different instruments].
abstract: OBJECTIVE
  The aim of this study was to analyse the relationship between left ventricular ejection fractions (EF) obtained using four different instruments.
  
  
  METHODS
  Eighty-five EF values were analysed. Gated acquisition was performed with the same gammacamera (SOPHA) using 99mTc-labelled red cells. Each EF was obtained using four processing systems: NXT (SOPHA), Entegra (Gems), Odyssey (Philips) and Esoft (Siemens), always working in automated mode. The paired student's t-test, Spearman correlation and Bland-Altman analysis were used to compare methods, and Deming regression was applied.
  
  
  RESULTS
  Mean values and standard deviations for each program were: NXT: 61 +/- 9; Entegra: 60 +/- 10; Odyssey: 60 +/- 9; Esoft: 60 +/- 10. Although no significant differences were found as a whole and the values were linearly related, the methods are not interchangeable.
  
  
  CONCLUSIONS
  The same program should be used in the follow-up of each patient, which is now easily achievable by means of the DICOM standard.
authors.affiliation: Servicio de Medicina Nuclear, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, España. rpuchal@csub.scs.es
authors.forename: R
authors.initials: R
authors.lastname: Puchal Añé
authors.forename: S
authors.initials: S
authors.lastname: Guirao Marín
authors.forename: A
authors.initials: A
authors.lastname: Domènech Vilardell
authors.forename: A
authors.initials: A
authors.lastname: Rodríguez Gassén
authors.forename: M T
authors.initials: MT
authors.lastname: Bajén Lázaro
authors.forename: Y
authors.initials: Y
authors.lastname: Ricart Brulles
authors.forename: M
authors.initials: M
authors.lastname: Murillo Sosa
authors.forename: J
authors.initials: J
authors.lastname: Martín-Comín
mesh_terms: D004562:Electrocardiography; D004912:Erythrocytes; D015637:Gated Blood-Pool Imaging / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D019275:Radiopharmaceuticals; D015203:Reproducibility of Results; D012984:Software; D013318:Stroke Volume; D013667:Technetium
chemical_list: D019275:Radiopharmaceuticals; D013667:Technetium