Ultrasound transducer arrays

An electro-acoustic module for an ultrasound transducer array, comprising:

• a base unit comprising an acoustic backing and a heat sink, wherein the heat sink is configured to detachably couple to a support structure of the ultrasound transducer array;
• an ASIC layer individually coupled to the base unit;
• a flex interconnect disposed on the ASIC layer and electrically coupled to a circuit board;
• and
• a matrix acoustic array disposed on the flex interconnect and comprising a plurality of stack elements at least partially separated by a vertical gap, wherein at least one narrow stack element is positioned between two wide stack elements, wherein the at least one narrow stack element has a width extending horizontally between the vertical gaps that is lesser than a width of the wide stack elements.