RIU 320 Lecture Notes - Lecture 40: Beam Diameter, Sound Energy, Lead Zirconate Titanate
11 May 2020
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More about lateral resolution, lateral resolution is best at the focus (at the end of the near zone) where the beam is narrowest. Lateral resolution is good within the focal zone. Higher frequency sound beams are narrower than lower frequency beams. 4: comparison of axial and lateral resolution orientation. Side by side; perpendicula r to beam mnemonic. Phased array focusing is reversed specifically for array transducers- those with multiple active elements: focusing techniques name method lens external. Fixed focusing techniques: also called conventional or mechanical focusing, includes both external and internal techniques. With fixed focusing, the focal depth and the extent of focusing are determined when the transducer is fabricated, and cannot be changed: external focusing: the lens, a lens is placed in front of piezoelectric material. In the image, the lens appears as the red structure and the pzt is green.
