An ultrasound probe may include a mechanical transducer and a probe housing. The mechanical transducer may be rotatable about an axis. The mechanical transducer may be operable to acquire ultrasound image data at one or more rotational positions of a plurality of rotational positions. The probe housing may include a probe cap covering the mechanical transducer. The mechanical transducer may be directed toward the probe cap at each of the plurality of rotational positions. The probe cap may include a defined structure having a first thickness and a remainder portion having a second thickness different than the first thickness. In various embodiments, at least a portion of the defined structure is at a center section of the probe cap corresponding with a center rotational position of the mechanical transducer.