Gabriel Blacher Grossman1,2, Ilo S Baptista3,4. 1. Nuclear Medicine Department, Hospital Moinhos de Vento, Porto Alegre, Brazil. ggrossman@terra.com.br. 2. Cardionuclear, Instituto de Cardiologia, Porto Alegre, Brazil. ggrossman@terra.com.br. 3. Nuclear Medicine Department, Hospital Moinhos de Vento, Porto Alegre, Brazil. 4. Cardionuclear, Instituto de Cardiologia, Porto Alegre, Brazil.