machine automatically select AVC at A3C just you need accept (approve) if you see the time of AVC with valve in A3C doesn't match you have too match and select the correct timing then accept
unfortunately no, but I have many clips in this matter and they cover everything in this field except 3-D strain. maybe in future I will prepare one for it too
it is the same as longitudinal , only in PSAX you measure radial and circumferential strain. so you take PSAX at 3 l3vels: MV, papillary and apex. then in you software you selects those and adjust ROI on endocardium and epicardium and machine give you those two type of strains.