A traceable surgical tool is positioned, monitored and displayed in real-time directly with pre-scanned three dimensional CT/MRI slices of a patient. The tool positioning and inclination is obtained by real time combined ultrasound (US)/RF transmissions between at least four transmitting units (TUs) and a mobile unit (MU) attached to or included in the tool. No more than three of the TUs may be coplanar. In some embodiments, at least one TU includes two US transmitters transmitting at different frequencies. Image space coordinates of the CT/MRI scanned patient are mapped by a one-to- one transformation onto real space coordinates of the patient undergoing a surgical procedure. The mapping is aided by, in the real space environment, touching once each of at least three markers fixedly attached to the patient and pre-scanned with the patient in the image space. A high resolution location of the tool is recorded in real-time, and the tools position is displayed together with reconstructed CT/MRI slices in real time.
