sonography, sonographer, fetal, vascular, abdominal, vaginal, endocavity, muscular, organ, transducer, linear, curved, array, tee, probe, vein, nerve, prostatte, fetus, health, depth, focus, contrast, imaging, 3d, 4d, dual, color, white-scale, screen, monitor, diagnostic, diagnose, gland, lymphnode, lymphnodes, positioning, position, bed, top, mattress, pad, footswitch, footpedal, foot, pedal, switch, remote,