Select the active contrast acquisition mode. "HRes", "AM", and "CHA"
HRes : The main purpose of HRes mode is to image the harmonic signal from the contrast agent. This mode transmits two consecutive pulses with inverted polarity as a contrast transmit group. The received signals are summed to cancel the fundamental (i.e. linear) responses and then the non-linear harmonic responses are extracted. Harmonic - perfusion, tumor flow characteristics
CHA : The main purpose of CHA mode is to image the non-linear signal from the contrast agent with strong tissue suppression. This mode transmits four consecutive pulses with alternate polarity (i.e. two pairs of Phase Inversion) as a contrast transmit group.
AM : The main purpose of AM mode is to image the non-linear signal from the contrast agent. This mode transmits two or more consecutive pulses with the different amplitude as a contrast transmit group. The received signals are summed with the different coefficients to cancel the linear responses and then the non-linear responses are extracted.