Test Probe
How does the ultrasound probe works in an ultrasound test?
How does the ultrasound work? A caregiver uses a wand called a transducer (trans-dew-sir). The transducer may also be called a probe. It is connected to the ultrasound machine. The transducer sends and receives sound waves as it is moved over your skin. The sound waves bounce off or “echo” against the organs inside your body.
The echoes are then sent through the machine and are changed into an image on the TV screen. Sound waves cannot go through air, bone or gas in the bowel. And, sound waves may have a hard time going through your body if you weigh too much.
http://www.drugs.com/CG/ULTRASOUND.html
Transducer Probe
The transducer probe is the main part of the ultrasound machine. The transducer probe makes the sound waves and receives the echoes. It is, so to speak, the mouth and ears of the ultrasound machine. The transducer probe generates and receives sound waves using a principle called the piezoelectric (pressure electricity) effect, which was discovered by Pierre and Jacques Curie in 1880. In the probe, there are one or more quartz crystals called piezoelectric crystals. When an electric current is applied to these crystals, they change shape rapidly. The rapid shape changes, or vibrations, of the crystals produce sound waves that travel outward. Conversely, when sound or pressure waves hit the crystals, they emit electrical currents. Therefore, the same crystals can be used to send and receive sound waves. The probe also has a sound absorbing substance to eliminate back reflections from the probe itself, and an acoustic lens to help focus the emitted sound waves.
Transducer probes come in many shapes and sizes, as shown in the photo above. The shape of the probe determines its field of view, and the frequency of emitted sound waves determines how deep the sound waves penetrate and the resolution of the image. Transducer probes may contain one or more crystal elements; in multiple-element probes, each crystal has its own circuit. Multiple-element probes have the advantage that the ultrasounc beam can be “steered” by changing the timing in which each element gets pulsed; steering the beam is especially important for cardiac ultrasound (see Basic Principles of Ultrasound for details on transducers). In addition to probes that can be moved across the surface of the body, some probes are designed to be inserted through various openings of the body (vagina, rectum, esophagus) so that they can get closer to the organ being examined (uterus, prostate gland, stomach); getting closer to the organ can allow for more detailed views.
http://www.howstuffworks.com/ultrasound.htm
Pistol Probe Pinpointer Test
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