Axial resolution example: If SPL is 1.2 mm, what is the axial resolution approximately?

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Multiple Choice

Axial resolution example: If SPL is 1.2 mm, what is the axial resolution approximately?

Explanation:
Axial resolution is determined by the length of the transmitted pulse in tissue, called the spatial pulse length (SPL). You can separate two reflectors along the beam only if they are spaced by at least about half of that pulse length; if they are closer, their echoes overlap and can’t be distinguished. So the axial resolution is roughly SPL divided by 2. With an SPL of 1.2 mm, the axial resolution is about 0.6 mm. Shorter pulses (fewer cycles or higher frequency) yield a smaller SPL and thus better axial resolution.

Axial resolution is determined by the length of the transmitted pulse in tissue, called the spatial pulse length (SPL). You can separate two reflectors along the beam only if they are spaced by at least about half of that pulse length; if they are closer, their echoes overlap and can’t be distinguished. So the axial resolution is roughly SPL divided by 2. With an SPL of 1.2 mm, the axial resolution is about 0.6 mm. Shorter pulses (fewer cycles or higher frequency) yield a smaller SPL and thus better axial resolution.

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