SPI Pulsed Ultrasound Exam Questions And
Answers
What are the units of PD?
A. A. units of frequency (Hz, etc.)
B. msec only
C. units of time (sec, years, etc.)
D. units of distance (feet, etc) -
correct answer ✅C. The PD is the actual time that a transducer is
creating one pulse. Hence, it has units of time. The typical range of
PDs found in diagnostic imaging equipment is 0.3 to 2 usec, but it is
valid to report PD in any unit of time.
What determines the PD?
A. the source of the wave
B. the medium in which the pulse travels
C. both A and B
D. neither A nor B -
correct answer ✅A. The PD is the actual time that a transducer is
creating one sound pulse and is determined by the ultrasound
system. PD does NOT include the listening time.
T/F: The PD of an ultrasound and transducer system does not
change significantly as long as the system components remain
,SPI Pulsed Ultrasound Exam Questions And
Answers
unchanged. -
correct answer ✅TRUE. The PD is the timespan that a pulse exists.
It is determined by the ultrasound system and the transducer.
Generally, it remains a constant for a particular transducer.
The PD is expressed in the same units as the:
A. period
B. PRF
C. wavelength
D. density -
correct answer ✅A. The PD and the period are measured in units
of time, such as seconds, minutes, or hours.
PRF has units of hertz. Wavelength has units of distance. Density
has units of mass per volume.
T/F: A sonographer can adjust the duration of an acoustic pulse
since it depends upon the pulse's propagation speed. -
correct answer ✅FALSE. A sonographer cannot change the PD. It is
a fixed feature of the transducer and ultrasound system. It does not
depend upon propagation speed.
, SPI Pulsed Ultrasound Exam Questions And
Answers
T/F: A sonographer can adjust the duration of an acoustic pulse
since it depends upon the maximum imaging depth. -
correct answer ✅FALSE. A sonographer cannot change the PD. it
has a constant value, and is not dependent on imaging depth.
T/F: The sonographer cannot change the duration of a sound pulse
unless the transducers are switched. -
correct answer ✅TRUE. The PD depends upon the interaction of
the pulser electronics of the machine and the transducer. The PD
may change when the sonographer changes transducers.
T/F: The PD cannot be changed under any circumstances or by any
action of the sonographer. -
correct answer ✅FALSE. A sonographer can alter the PD by using a
different imaging transducer or ultrasound system.
What is the PD equal to?
A. frequency multiplied by period
B. period multiplied by wavelength
C. the number of cycles in the pulse divided by the wavelength
D. period multiplied by the number of cycles in the pulse. -
correct answer ✅D. The PD is the total time that the transducer is
Answers
What are the units of PD?
A. A. units of frequency (Hz, etc.)
B. msec only
C. units of time (sec, years, etc.)
D. units of distance (feet, etc) -
correct answer ✅C. The PD is the actual time that a transducer is
creating one pulse. Hence, it has units of time. The typical range of
PDs found in diagnostic imaging equipment is 0.3 to 2 usec, but it is
valid to report PD in any unit of time.
What determines the PD?
A. the source of the wave
B. the medium in which the pulse travels
C. both A and B
D. neither A nor B -
correct answer ✅A. The PD is the actual time that a transducer is
creating one sound pulse and is determined by the ultrasound
system. PD does NOT include the listening time.
T/F: The PD of an ultrasound and transducer system does not
change significantly as long as the system components remain
,SPI Pulsed Ultrasound Exam Questions And
Answers
unchanged. -
correct answer ✅TRUE. The PD is the timespan that a pulse exists.
It is determined by the ultrasound system and the transducer.
Generally, it remains a constant for a particular transducer.
The PD is expressed in the same units as the:
A. period
B. PRF
C. wavelength
D. density -
correct answer ✅A. The PD and the period are measured in units
of time, such as seconds, minutes, or hours.
PRF has units of hertz. Wavelength has units of distance. Density
has units of mass per volume.
T/F: A sonographer can adjust the duration of an acoustic pulse
since it depends upon the pulse's propagation speed. -
correct answer ✅FALSE. A sonographer cannot change the PD. It is
a fixed feature of the transducer and ultrasound system. It does not
depend upon propagation speed.
, SPI Pulsed Ultrasound Exam Questions And
Answers
T/F: A sonographer can adjust the duration of an acoustic pulse
since it depends upon the maximum imaging depth. -
correct answer ✅FALSE. A sonographer cannot change the PD. it
has a constant value, and is not dependent on imaging depth.
T/F: The sonographer cannot change the duration of a sound pulse
unless the transducers are switched. -
correct answer ✅TRUE. The PD depends upon the interaction of
the pulser electronics of the machine and the transducer. The PD
may change when the sonographer changes transducers.
T/F: The PD cannot be changed under any circumstances or by any
action of the sonographer. -
correct answer ✅FALSE. A sonographer can alter the PD by using a
different imaging transducer or ultrasound system.
What is the PD equal to?
A. frequency multiplied by period
B. period multiplied by wavelength
C. the number of cycles in the pulse divided by the wavelength
D. period multiplied by the number of cycles in the pulse. -
correct answer ✅D. The PD is the total time that the transducer is
