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chapter 12 (elevational thickness)
Terms in this set (10)
Elevational resolution (slice thickness)
resolution in the third dimension of the beam.
The detail resolution in the direction perpendicular to the scan plane. It is equal to the section thickness and is the source of section thickness artifact.
Elevational resolution is determined by ______.
thickness of the imaging plane
elevational resolution shape
Active elements that are disc shaped provide the thinnest US slices and best elevation resolution within focal zone.
elevational resolution transducer?
disc shaped crystals are found in mechanical and annular phased arrays.
additional areas of sound energy extend outside of the main beam in the far zone.
created by single element transducers
additional weaker beams of sound traveling out in directions different from the primary beam as a result of multi-element structure of array transducer.
Side lobes and grating lobes diminish image quality by degrading:
2 ways to reduce grating lobes
process that reduces strength of side and grating lobes, grating lobes can be eliminated if the strength of the electrical spikes differs from element to element.
dividing the piezoelectric elements into very small pieces to reduce grating lobes
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