Systems and methods are shown which provide feedback with respect to the desired or proper placement of a medical device guide without introducing protuberances or other perturbations to the surface of devices used in medical procedures. Embodiments provide a biopsy needle guide bracket for use with an ultrasound transducer assembly, wherein the biopsy needle guide bracket and ultrasound transducer assembly are adapted to detect when the biopsy needle guide bracket is properly located on the ultrasound transducer assembly using one or more sensors. Embodiments may implement various sensor technology, such as Hall effect sensors, optical sensors, capacitive coupled sensors, inductive coupled sensors, and/or the like to provide feedback with respect to placement of a medical device guide.