1. Medical Imaging Research Laboratory, LABIMED, Department of Radiology, Pavilhão Pereira Filho Hospital, Irmandade Santa Casa de Misericórdia de Porto Alegre, Av. Independência 75, Porto Alegre 90020160, Brazil.
2. Department of Diagnostic Methods, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil.
3. Department of Radiology, Pontificia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil.
4. Department of Radiology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
5. Heart Institute, Clinical Hospital of the University of São Paulo, São Paulo, Brazil.