The image preferably depicts features such as bones, teeth and nerve canals (see FIGS. 24a,b,c and d.) FIG. 24d clearly indicates that images acquired by ultrasound are more informative than those acquired by prior art X-ray methods. [0101] According some preferred embodiments of system 520, probe 522 is a mandibular probe designed and constructed to facilitate imaging of at least a portion of a l