A dual imaging probe 300 for obtaining both ultrasound and electrical impedance data is disclosed along with methods of using the dual imaging probe 300 to interrogate tissue. An electrical impedance imaging overlay 330 is adapted to be positioned on a transducer window 304 of an ultrasound probe 320, and may be integrally formed as part of the ultrasound probe 320 or as a modular adapter for coupling with, and optionally uncoupling from, an ultrasound probe 320 to form the dual imaging probe 300. A method (FIG. 6) of reconstructing composite images using both ultrasound and electrical impedance data is described. Applications for medical diagnosis are described. A particular use for prostate imaging is described.