A medical diagnostic ultrasound transducer system has at least a first and
a second set of transducer layers of an element. Each set has one or more
transducer layers with independent electrical access. A transmit event
through a first set of transducer layers with broadband electrical
signals generates acoustic signals containing at least two different
frequency bands, and a receive event through a second and different set
of transducer layers receives multiple tissue harmonic signals to
generate a wide bandwidth response. Fundamental signals can be reduced
with a pulse inversion technique through a second transmit event of
inverted pulses, a second receive event and superposition of signals from
the two receive events.