A phased array ultrasonic probe assembly includes, in an exemplary embodiment, a housing and a phased array transducer supported inside the housing. The housing includes a first side wall and an opposing second side wall, and a first end wall and an opposing second end wall. The first and second side walls and the first and second end walls define a housing cavity in which the phased array transducer is positioned. The first and second side walls each have an inside surface that include a plurality of projections.