In ultrasound, spatial information is obtained simply by focusing and aiming a pulsed ultrasound beam.

This project involved direction of an intense focused ultrasound beam at the region of the ciliary body to cause cyclodestruction.

The ultrasound beam can be focused in these ways:

The explanation for this is that the heart rests directly upon the esophagus leaving only millimeters that the ultrasound beam has to travel.

Early researchers into underwater ultrasound soon found that small water animals sometimes died if caught in ultrasound beams.

So that, any tissue will still reflect the ultrasound beam to some degree.

The depth reached by the ultrasound beam is dependent on the frequency of the probe used.

An ultrasound beam is directed at the area being analyzed.

One of the limitations is that the ultrasound beam should be as parallel to the blood flow as possible.

The other design propagates an ultrasound beam along a long bone like the tibia.