Smaller diameter PZT crystals create _______ focus beams whereas larger diameter crystals create ______ focus beams.

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Multiple Choice

Smaller diameter PZT crystals create _______ focus beams whereas larger diameter crystals create ______ focus beams.

Explanation:
The aperture size of the crystal acts like a lens for the ultrasound beam: a larger aperture converges the wavefront more strongly, producing a tighter beam that reaches its narrowest point deeper in the tissue. A smaller aperture converges less, so the focus occurs nearer to the transducer. So, smaller diameter crystals create a shallower focus, while larger diameter crystals create a deeper focus.

The aperture size of the crystal acts like a lens for the ultrasound beam: a larger aperture converges the wavefront more strongly, producing a tighter beam that reaches its narrowest point deeper in the tissue. A smaller aperture converges less, so the focus occurs nearer to the transducer. So, smaller diameter crystals create a shallower focus, while larger diameter crystals create a deeper focus.

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