Physics Quiz 1
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Increase density = ?
Increase density = decrease velocity
Increase compressibility = ?
Increase compressibility = decrease velocity
Increase stiffness = ?
Increase stiffness = increase velocity
Pulse Repetition Frequency (PRF)
The number of pulses emitted per second
Typical range: 1-10KHz
Pulse Repetition Period (PRP)
The time from the beginning of one pulse to the beginning of the next
Time of producing and receiving echo
Pulse Duration (PD)
The time during which the pulse actually occurs
PD = ?
- PD = number of cycles X period
- PD = number of cycles / Frequency
Duty Factor (DF)
The fraction of time the ultrasound pulse is being emitted during one pulse repetition period
The DF of Continuous Wave is 1(100%)
The DF of Pulse Wave is less than 1
DF = ?
DF = Pulse Duration/ Pulse Repetition Period
Spatial Pulse Length (SPL)
The length or space over which an ultrasound pulse occurs
Units : meter, mm
- Affects greatly of image resoultion
- -long SPL will interact with a tissue interface longer than a short SPL, which as blurred image
Closer to the transducer
Farther to the transducer
Divergence of the beam
Beam Shape Parameter
Ultrasound frequency and transducer diameter affect the length of near field and divergence of far field
Increase frequency and transducer diameter = increase near field length and decrease divergence of far field
Increase Transducer diameter =
Increase Transducer diameter = (frequency is constant) length of near field increase and decrease far field divergence
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