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What is spatial pulse length?
the distance that a pulse occupies in space from the start to the end of a pulse
What units represent spatial pulse length?
units of distance; mm
What are the typical values of spatial pulse length in soft tissue?
0.1 to 1mm
What determines the spatial pulse length?
both the sound source and the medium
Is spatial pulse length adjustable?
no
What is spatial pulse length directly proportional to?
number of cycles in a pulse, and wavelength
What is spatial pulse length inversely proportional to?
frequency
What is the difference between pulse duration and spatial pulse length?
pulse duration is the time the pulse is “on”, spatial pulse length is the distance of the pulse from end to end.
What are two characterisitics that create long pulses?
many cycles in the pulse, cycles with longer wavelengths
What are two characteristics that create short pulses?
fewer cycles in the pulse, cycles with shorter wavelengths
What spatial pulse length is more desirable?
shorter