Physics and Instrumentation Ch 4

the parameters of pulsed sound are…

pulse duration, spatial pulse length, pulse repetition frequency, pulse repetition period, duty factor

pulse duration equations (2)

cycles x period, cycles / frequency

pulse duration relationship to spatial period length, frequency

direct, inverse

pulse repetition period is the… unit…

time from start of one pulse to start of next, microseconds

an increased PRP means … listening time, … depth

increased, increased

spatial pulse length equation

cycles x wavelength

pulse repetition frequency is the… units…

pulses per second, hz

PRP relationship to depth

direct

PRF relationship to depth

inverse

prp and prf relationship, equation

reciprocals, prf x prp = 1

duty factor is the…

percent of prp that is the transmitting time

parameters controlled by sonographer; how?

duty factor, prp, prf; depth

duty factor relationship to depth

inverse

duty factor equation

pd / prp

shallow imaging …listening, …df, …prf, …prp (less or more than deep)

less, more, more, less

deep imaging …listening, …df, …prf, …prp (less or more than shallow)

more, less, less, more