A) TSI in the apical four-chamber view. All LV segments are color-coded in green. Therefore, S' must be within the first third of the transaortal flow in the following TDI measurements. B) TDI in the apical four-chamber view. The interval between the aortic valve opening (AVO) and the peak systolic velocity (S') is 60 ms. In agreement with the TSI data, S' can be found within the first third of the transaortal flow.