High frequency sound beams are ______ than low frequency beams.

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Multiple Choice

High frequency sound beams are ______ than low frequency beams.

Explanation:
Beam width is controlled by diffraction and varies with wavelength. Higher frequency sound has a shorter wavelength, so for the same transducer aperture the waves diffract less and stay more tightly focused as they propagate. That makes the beam narrower than a low-frequency beam, which translates to better lateral resolution. Keep in mind that higher frequency also attenuates more quickly in tissue, reducing penetration.

Beam width is controlled by diffraction and varies with wavelength. Higher frequency sound has a shorter wavelength, so for the same transducer aperture the waves diffract less and stay more tightly focused as they propagate. That makes the beam narrower than a low-frequency beam, which translates to better lateral resolution. Keep in mind that higher frequency also attenuates more quickly in tissue, reducing penetration.

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