DMS 150 Midterm Review Questions With Complete
Solutions
If you have two waves directed in the same direction, and appear
to be "in phase' with each other, the ending result is considered
what?
constructive interference
Wavelength is the distance over which one cycle occurs.
Wavelength is the length of space that one cycle takes up
True
Stiffer media have higher sound speeds
True
Propagation speed is higher in bone than in soft tissue.
Propagation speeds are highest in solids (bone) and lowest in
gases (lung)
True
Regions of lower pressure and density are called ________.
A. compressions
B. rarefactions
C. longitudinal waves
D. acoustic variables
B.
Regions of high pressure and density are called compressions.
True
,If the number of cycles in a pulse is reduced, the pulse duration
________.
A. is increased
B. is decreased
C. remains unchanged
D. is not possible
B.
Duty factors for sonography are typically in the range of
________%.
A. 1
B. 5
C. 99
D. 100
A.
In Doppler ultrasound, because of longer pulse durations, the
range of typical duty factors is 0.1% to 1%.
True
If the wavelength is 0.5 mm, the spatial pulse length for a 4
cycle pulse is ________.
A. 0.2 mm
B. 8.0 mm
C. 0.8 mm
D. 2.0 mm
D. (Use formula: Spatial pulse length (mm) = wavelength (mm)
× number of cycles in a pulse)
, The fraction of time that pulsed ultrasound is on is called
________.
A. pulse repetition period
B. duty factor (DF)
C. period
D. spatial pulse length
B.
Which type of pulse will have better resolution
A. short pulses
B. long pulses
C. No answer text provided.
D. No answer text provided.
A.
Pulse repetition frequency (PRF) refers to the ________ of
pulses occurring in one second.
A. speed
B. number
C. type
D. cycle
B.
The time from the start of one pulse to the next time is called:
A. PRP (Pulse Repetition Period)
B. PRF (Pulse Repetition Frequency)
C. Duty Factor
D. Pulse Duration
A.
Solutions
If you have two waves directed in the same direction, and appear
to be "in phase' with each other, the ending result is considered
what?
constructive interference
Wavelength is the distance over which one cycle occurs.
Wavelength is the length of space that one cycle takes up
True
Stiffer media have higher sound speeds
True
Propagation speed is higher in bone than in soft tissue.
Propagation speeds are highest in solids (bone) and lowest in
gases (lung)
True
Regions of lower pressure and density are called ________.
A. compressions
B. rarefactions
C. longitudinal waves
D. acoustic variables
B.
Regions of high pressure and density are called compressions.
True
,If the number of cycles in a pulse is reduced, the pulse duration
________.
A. is increased
B. is decreased
C. remains unchanged
D. is not possible
B.
Duty factors for sonography are typically in the range of
________%.
A. 1
B. 5
C. 99
D. 100
A.
In Doppler ultrasound, because of longer pulse durations, the
range of typical duty factors is 0.1% to 1%.
True
If the wavelength is 0.5 mm, the spatial pulse length for a 4
cycle pulse is ________.
A. 0.2 mm
B. 8.0 mm
C. 0.8 mm
D. 2.0 mm
D. (Use formula: Spatial pulse length (mm) = wavelength (mm)
× number of cycles in a pulse)
, The fraction of time that pulsed ultrasound is on is called
________.
A. pulse repetition period
B. duty factor (DF)
C. period
D. spatial pulse length
B.
Which type of pulse will have better resolution
A. short pulses
B. long pulses
C. No answer text provided.
D. No answer text provided.
A.
Pulse repetition frequency (PRF) refers to the ________ of
pulses occurring in one second.
A. speed
B. number
C. type
D. cycle
B.
The time from the start of one pulse to the next time is called:
A. PRP (Pulse Repetition Period)
B. PRF (Pulse Repetition Frequency)
C. Duty Factor
D. Pulse Duration
A.
