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Why can higher-frequency ultrasound produce sharper images?

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In the context of physics, higher-frequency ultrasound produces sharper images because it corresponds to shorter wavelengths.1

The ability of a wave to resolve detail is limited by diffraction, which is the tendency of waves to bend around obstacles and spread out. When the wavelength is large relative to an object, the wave diffracts around it, making it difficult to form a clear image. However, as the frequency increases, the wavelength shrinks, which reduces this diffraction.23

Because shorter wavelengths diffract less, they behave more like light rays, allowing for the formation of more precise shadows and higher resolution. Consequently, by using higher frequencies, ultrasonic systems can achieve greater detail, though this comes with the trade-off that higher-frequency waves are more strongly absorbed by tissue.31