Spatial pulse length and pulse duration are related how?

Spatial pulse length and pulse duration are related how?

• A. Inversely related
• B. Directly related
• C. Not related
• D. Poorly related

Answer: (B)

Spatial pulse length and pulse duration are directly related because they describe the same physical length of the sound pulse, just in different terms. In tissue with a roughly constant speed of sound, the time span of the pulse (pulse duration) converts straight into a distance the pulse occupies (spatial pulse length). If you increase how long the pulse lasts, more cycles fit into that pulse, so the distance it spans grows proportionally. In formula terms, spatial pulse length is proportional to pulse duration via the speed of sound: SPL ≈ c × pulse duration. So doubling the pulse duration doubles the spatial pulse length, assuming the medium’s speed of sound is unchanged.

Spatial pulse length and pulse duration are directly related because they describe the same physical length of the sound pulse, just in different terms. In tissue with a roughly constant speed of sound, the time span of the pulse (pulse duration) converts straight into a distance the pulse occupies (spatial pulse length). If you increase how long the pulse lasts, more cycles fit into that pulse, so the distance it spans grows proportionally. In formula terms, spatial pulse length is proportional to pulse duration via the speed of sound: SPL ≈ c × pulse duration. So doubling the pulse duration doubles the spatial pulse length, assuming the medium’s speed of sound is unchanged.