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TR ERO = (6,28 x TR PISA R² x TR Alias V) : TR Vmax

TR Vmax: CW, Apical 4C view.
TR PISA R: CD, Apical 4C view.
TR Alias V: CD, Apical 4C view.


Example:
TR Vmax = 278 cm/s
TR PISA R = 0,99 cm
TR Alias V = 18 cm
TR ERO = (6,28 x 0,99² x 18) : 278 = 0,40 cm²