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Sono Transducers 2

Physics of Sonography; Transducer Physics and Terms

QuestionAnswer
What is a sound beam? The width of a pulse as it travels away from the transducer.
Define Beam Width. Width of the pulse as it moves away from the transducer.
What are Side Lobes. Sound that has escaped out of the side of the sound beam.
What is an Alternate name for Near zone? Fresnel Zone
How far does the Near Zone extend? One Near Zone Length
What zones does a sound beam have? A Near and Far Zone
The Near Zone length is determined by? Size and Operating frequency of the element
Near Zone length increases proportionally/exponentially with increasing frequency? proportionally
Higher frequencies produce ____ beam diameters and longer NZL Small
The larger transducer diameter produces a longer ___ NZL
Alternate name for Far zone? Fraunhofer Zone
Define Far zone. Region that lies beyond a distance of one near zone length.
Where does the sound beam Diverge? Far Zone
Beam Diameter depends on: Wavelength, Element diameter, Distance from the element.
What is the beam diameter at one NZL? it is half of the transducer diameter
What is the distance when the beam diameter equals the transducer diameter? 2 times the NZL
Beyond one NZL, the Beam Diameter _________ in proportion to distance Increases
The beam diameter decreases/increases as sound travels through the near zone Decreases
Beam diameter is determined by? The frequency and Diameter of the element.
Focusing can occur anywhere in the sound beam. True or False False (only near zone)
An increase/decrease in frequency or transducer diameter, increases NZL Increase
Define the Focal Zone The zone between the near zone and far zone which has the best resolution in the sound beam.
Define Diffraction Sound going in all directions from a small point source
What is Huygen's Principle The principle that each small portion of the surface of a transducer may be considered as a separate sound source.
Define Beam Formation The result of combining the sound coming from all point sources of a transducer
Can Focusing Occur in the Far Zone? No, focusing can only occur in the near zone.
Focusing ________ resolution. Beam width is _________ in the focal region and widens in the region beyond. Increases; decreased
Define Focal Zone Distance between equal beam widths
The more an element is curved, the closer/farther the focus moves in relation to the transducer. closer
What is the Aperture? Transducer Size
What formula finds F number Focal length divided by the aperature
As the aperture is increased, the focus _______ and the focal region ________. Narrows; Shortens
Created by: A-Hole
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