A system and method for imaging and identifying non-viable myocardial tissue in a patient’s myocardium is disclosed. The node comprises a client monitor and a quality module. In a second operating mode, the output device is turned off and the second impedance transformation network connects an output of the driver device to the first impedance transformation network and presents a second load impedance to the driver device. If layer-jump failure, no matter where the focus is, an auxiliary force is provided to let the lens continuously move along the layer jump direction and prevent the focus from locating between the two data layers. The surface roughness RA after roughening is uniform, covers the entire area and lies in the range from 1. In one embodiment, the controller may be adapted to adjust timing of a read clock pulse differently from a write clock pulse.