DMSO Chapter 4 And 5 Pre Questions All
Answered Correctly 2026-2027.
pulse - Answer Transmitting and Listening time
ultrasound and doppler use this
pulsed sound - Answer the fundamental of ultrasound imaging
series of individual cycles that move through a medium as a single unit
five parameters for pulsed waves - Answer 1. pulse duration
2. spatial pulse length
3. pulse repetition period
4. pulse repetition frequency
5. duty factor
Can we change a pulse? - Answer We cannot change the characteristics of the actual pulse
without changing our imaging system (transducer and machine)
Determined by the machine
Pulse Duration (PD) - Answer The actual time from start of a pulse to the end of that pulse
(not including the listening time)
Is pulse duration determined by the source? - Answer Yes
time of the pulse - Answer single transmit, talking, or "ON TIME"
Pulse duration formula - Answer = # cycles x period (ms) or = # cycles/frequency (MHz)
PD = # cycles in pulse x period (ms)
proportional or not? - Answer directly proportional to the number of cycles in the pulse
directly proportional to the period
PD= # cycles divided by frequency (MHz)
, proportional or not? - Answer inversely proportional to the frequency
what two characteristics create pulses with long durations?
(Pulse duration question) - Answer Many cycles in the pulse
Individual cycles with long periods
what two characteristics create pulses with short durations?
(PD question) - Answer Individual cycles with short periods
Few cycles in the pulse
In normal ultrasound imaging a typical pulse consists of between... - Answer two to four cycles
In diagnostic ultrasound... - Answer shorter pulse durations create better images.
Spatial Pulse Length (SPL) - Answer the distance a pulse occupies in space from the start of the
pulse to its end.
What is SPL determined by? - Answer sound source and medium
Can the sonographer alter SPL? - Answer No
SPL formula - Answer # of cycles x wavelength
SPL directly proportional to - Answer to the number of cycles in each pulse
to the wavelength of each cycle
SPL inversely proportional to - Answer frequency
What is the difference between pulse duration and spatial pulse length? - Answer PD is time
SPL is distance
What are the characteristics of a pulse with a long SPL? - Answer more cycles
Answered Correctly 2026-2027.
pulse - Answer Transmitting and Listening time
ultrasound and doppler use this
pulsed sound - Answer the fundamental of ultrasound imaging
series of individual cycles that move through a medium as a single unit
five parameters for pulsed waves - Answer 1. pulse duration
2. spatial pulse length
3. pulse repetition period
4. pulse repetition frequency
5. duty factor
Can we change a pulse? - Answer We cannot change the characteristics of the actual pulse
without changing our imaging system (transducer and machine)
Determined by the machine
Pulse Duration (PD) - Answer The actual time from start of a pulse to the end of that pulse
(not including the listening time)
Is pulse duration determined by the source? - Answer Yes
time of the pulse - Answer single transmit, talking, or "ON TIME"
Pulse duration formula - Answer = # cycles x period (ms) or = # cycles/frequency (MHz)
PD = # cycles in pulse x period (ms)
proportional or not? - Answer directly proportional to the number of cycles in the pulse
directly proportional to the period
PD= # cycles divided by frequency (MHz)
, proportional or not? - Answer inversely proportional to the frequency
what two characteristics create pulses with long durations?
(Pulse duration question) - Answer Many cycles in the pulse
Individual cycles with long periods
what two characteristics create pulses with short durations?
(PD question) - Answer Individual cycles with short periods
Few cycles in the pulse
In normal ultrasound imaging a typical pulse consists of between... - Answer two to four cycles
In diagnostic ultrasound... - Answer shorter pulse durations create better images.
Spatial Pulse Length (SPL) - Answer the distance a pulse occupies in space from the start of the
pulse to its end.
What is SPL determined by? - Answer sound source and medium
Can the sonographer alter SPL? - Answer No
SPL formula - Answer # of cycles x wavelength
SPL directly proportional to - Answer to the number of cycles in each pulse
to the wavelength of each cycle
SPL inversely proportional to - Answer frequency
What is the difference between pulse duration and spatial pulse length? - Answer PD is time
SPL is distance
What are the characteristics of a pulse with a long SPL? - Answer more cycles
