INTRO TO DMS Chapter 1: Foundations of Clinical
Sonography Questions With Complete Solutions
____ adjusts the horizontal axis of an image and may be used to
reduce ____ Correct Answers side-lobe artifacts
_______ is the basis for all real-time imaging in ultrasound
Correct Answers B mode
_____picked up by transducer are applied to the receiver in 3D
ultrasound Correct Answers echoes
_____retains data for viewing or storage on digital media.
Correct Answers image memory (scan converter)
1 oscillation/second:
how many cycles per second? Hz? Correct Answers 1
oscillation/sec = 1 cycle/sec = 1 hertz (1 Hz)
1,000,000 oscillations/sec :
how many cycles per second? Hz? Correct Answers 1,000,000
oscillations/sec = 1 megacycle/sec = 1 megahertz (1 MHz)
1000 oscillations/sec:
how many cycles per second? Hz? Correct Answers 1000
oscillations/sec = 1 kilocycle/sec = 1 kilohertz (1 kHz)
2 properties of velocity of propigation Correct Answers -
constant for given tissue
-not affected by the frequency or wavelength of pulse
,A Mode represents the time/distance it takes for Correct
Answers the beam to strike the interface and return the signal to
the transducer
abdomen is usually scanned with a Correct Answers curved
linear array and / or sector array; frequency will depend on the
size of the patient
Accurate detection of Doppler frequencies requires that Correct
Answers that Doppler signal be sampled at least twice for each
cycle in wave.
Acoustic exposure to the patient _____ when the receiver gain is
increased Correct Answers remains unchanged
acoustic frequencies used in sonar systems vary from Correct
Answers very low (infrasonic) to extremely high (ultrasonic)
Acoustics Correct Answers -The branch of physics that deals
with sound and sound waves
-Acoustics is the study of generating, propagating, and receiving
sound waves.
Advantages of a Sonography Career Correct Answers -
Specialized education in ultrasound garners respect of other
allied health professionals and clinicians
-Provides daily opportunities to use creativity to meet the
challenge of performing quality ultrasound examinations on
difficult patients
-New applications in ultrasound and improvements in
instrumentation provide continual challenge
, -Flexible schedules and varieties in examinations, equipment,
patient personalities
-Certified sonographers have abundant employment
opportunities with attractive salaries
advantages to ultrasound Correct Answers -no harmful effects
-no ionizing radiation
-portable equipment
-real-time format
-image enhancement
-fairly inexpensive
Aliasing also occurs in color-flow imaging when Doppler
frequencies exceed the Nyquist limit, as in spectral Doppler.
How does it appear? Correct Answers Appears as wrap-around
of displayed color
Aliasing Correct Answers appears on spectral display as the
apparent reversal of flow direction and "wrapping around" of
Doppler spectral waveform
Aliasing usually occurs when flows are Correct Answers
greater than 2 m/sec
amplitude modulation (A mode) produces a Correct Answers
one dimensional image that displays the following:
-amplitude strength of returning echo signals along the vertical
axis
-time (distance) along the horizontal axis
Sonography Questions With Complete Solutions
____ adjusts the horizontal axis of an image and may be used to
reduce ____ Correct Answers side-lobe artifacts
_______ is the basis for all real-time imaging in ultrasound
Correct Answers B mode
_____picked up by transducer are applied to the receiver in 3D
ultrasound Correct Answers echoes
_____retains data for viewing or storage on digital media.
Correct Answers image memory (scan converter)
1 oscillation/second:
how many cycles per second? Hz? Correct Answers 1
oscillation/sec = 1 cycle/sec = 1 hertz (1 Hz)
1,000,000 oscillations/sec :
how many cycles per second? Hz? Correct Answers 1,000,000
oscillations/sec = 1 megacycle/sec = 1 megahertz (1 MHz)
1000 oscillations/sec:
how many cycles per second? Hz? Correct Answers 1000
oscillations/sec = 1 kilocycle/sec = 1 kilohertz (1 kHz)
2 properties of velocity of propigation Correct Answers -
constant for given tissue
-not affected by the frequency or wavelength of pulse
,A Mode represents the time/distance it takes for Correct
Answers the beam to strike the interface and return the signal to
the transducer
abdomen is usually scanned with a Correct Answers curved
linear array and / or sector array; frequency will depend on the
size of the patient
Accurate detection of Doppler frequencies requires that Correct
Answers that Doppler signal be sampled at least twice for each
cycle in wave.
Acoustic exposure to the patient _____ when the receiver gain is
increased Correct Answers remains unchanged
acoustic frequencies used in sonar systems vary from Correct
Answers very low (infrasonic) to extremely high (ultrasonic)
Acoustics Correct Answers -The branch of physics that deals
with sound and sound waves
-Acoustics is the study of generating, propagating, and receiving
sound waves.
Advantages of a Sonography Career Correct Answers -
Specialized education in ultrasound garners respect of other
allied health professionals and clinicians
-Provides daily opportunities to use creativity to meet the
challenge of performing quality ultrasound examinations on
difficult patients
-New applications in ultrasound and improvements in
instrumentation provide continual challenge
, -Flexible schedules and varieties in examinations, equipment,
patient personalities
-Certified sonographers have abundant employment
opportunities with attractive salaries
advantages to ultrasound Correct Answers -no harmful effects
-no ionizing radiation
-portable equipment
-real-time format
-image enhancement
-fairly inexpensive
Aliasing also occurs in color-flow imaging when Doppler
frequencies exceed the Nyquist limit, as in spectral Doppler.
How does it appear? Correct Answers Appears as wrap-around
of displayed color
Aliasing Correct Answers appears on spectral display as the
apparent reversal of flow direction and "wrapping around" of
Doppler spectral waveform
Aliasing usually occurs when flows are Correct Answers
greater than 2 m/sec
amplitude modulation (A mode) produces a Correct Answers
one dimensional image that displays the following:
-amplitude strength of returning echo signals along the vertical
axis
-time (distance) along the horizontal axis
