10 Medical devices, apparatus, and instruments for use in the field of medical imaging, namely, medical needles; medical needle acoustic sensors for receiving acoustic probe signals for diagnosing medical conditions and use in surgical procedures; injection, biopsy and aspiration needles; acoustic sensors for use with injection, biopsy and aspiration needles; modules for visualizing acoustic sensor position namely, medical ultrasound probes; modules for visualizing the patient anatomy namely, medical ultrasound probes; modules for determining the position of acoustic sensors in relation to the patient anatomy namely, medical ultrasound probes; modules in the nature of medical ultrasound probes for a tracking position of needle during a diagnostic, therapeutic and surgical procedure; medical ultrasound probes for tracking a needle used with a medical ultrasound apparatus, the ultrasound apparatus being comprised of a probe, software for use therefor, a needle acoustic sensor for receiving acoustic probe signals and interfacing with the software and a display for visualizing patient anatomy and needle tracking