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Drs. Howry and Holmes at the University of Colorado Medical School have applied the same sonar technique to other areas of soft tissue and have obtained extremely good results.

By submerging the patient in a tub and rotating the transducer while the scanning goes on, they have been able to get cross-section views of the neck, as shown in Fig. 7, as well as many other hitherto impossible insights.

As mentioned before, bone reflects the sound energy and in Fig. 7 the portion of the spine shows as the black area in the center.

Arteries and veins are apparent by their black, blood-filled centers and the surrounding white walls.