1
DAVIES SPI: IV. Pulse-Echo Instrumentation (30% of
ARDMS) Questions and Answers|2025 Update | 100%
Correct.
What is a typical frame rate for B-mode real-time imaging?
A. 1-9 kHz
B. 10-50 Hz
C. 100-200 MHz
D. 200-300 Hz
E. 0.05-0.9 Hz - (answers)B. 10-50 Hz
<Frame rates are displayed in terms of Hz, a unit of frequency equal to one cycle
per second. Although frame rates vary, typical real-time frame rates range from
10 Hz to 50 Hz. If the frame rate is 30 Hz, that means 30 frames are produced in
one second. Faster frame rates are found with cardiac imaging>
What component is necessary for a real-time B-mode scanner but is not present
in A-mode scanner?
A. Clock
B. Transmitter
C. Transducer
D. Scan converter
E. Receiver - (answers)D. Scan converter
, 2
Preprocessing functions may be defined as:
A. Any function that can be performed on a frozen image
B. A function that takes place in the beam former and is not controllable by the
operator
C. A function that allows increased focusing of the sound beam
D. A function that is performed before the echo data are stored in memory
E. Any function that changes the quality of the ultrasound image - (answers)D. A
function that is performed before the echo data are stored in memory
<Any function that occurs after this point is referred to as postprocessing. The
easiest way to distinguish pre- and postprocessing functions is this: If it can't be
performed on a frozen image, it is preprocessing; if it can be performed on a
frozen image, it is postprocessing>
You have decreased the scan line density. What technique will be employed to fill
in the empt data between the scan lines?
A. Interpolation
B. Rejection
C. Compression
D. Autocorrelation
E. Demodulation - (answers)A. Interpolation
, 3
<Interpolation is used to fill in the missing data between scan lines in both gray-
scale and color Doppler. The missing data are estimated from the data present in
nearby pixels on adjacent scan lines>
Which of the following ultrasound examinations would require the highest frame
rate?
A. Small parts
B. Abdominal
C. Pelvic
D. Vascular
E. Cardiac - (answers)E. Cardiac
<Since the heart is a rapidly moving structure, high frame rates are required to
assess it accurately>
A-mode display is most commonly used for what type of ultrasound imaging?
A. Small parts
B. Abdominal
C. Cardiac
D. Vascular
, 4
E. Ophthalmologic - (answers)E. Ophthalmologic
The spatial resolution of the scan converter is determined by:
A. Number of pixels in the scan converter matrix
B. Number of bits per pixel
C. The postprocessing settings
D. Brightness and contrast settings of the monitor
E. Interpolation scheme - (answers)A. Number of pixels in the scan converter
matrix
<A matrix of 512 x 512 pixels is capable of much better spatial resolution than a
similarly sized matrix containing only 64 x 64 pixels. In the latter example, the
image would appear blocky with discrete square-shaped segments. Image
resolution would be degraded>
A type of sonographic imaging that transmits two pulses of opposite phase in
rapid succession so they can be cancelled out upon reception is termed:
A. Pulse inversion harmonics
B. Compound imaging
C. Speckle reduction imaging
D. Tomographic imaging
DAVIES SPI: IV. Pulse-Echo Instrumentation (30% of
ARDMS) Questions and Answers|2025 Update | 100%
Correct.
What is a typical frame rate for B-mode real-time imaging?
A. 1-9 kHz
B. 10-50 Hz
C. 100-200 MHz
D. 200-300 Hz
E. 0.05-0.9 Hz - (answers)B. 10-50 Hz
<Frame rates are displayed in terms of Hz, a unit of frequency equal to one cycle
per second. Although frame rates vary, typical real-time frame rates range from
10 Hz to 50 Hz. If the frame rate is 30 Hz, that means 30 frames are produced in
one second. Faster frame rates are found with cardiac imaging>
What component is necessary for a real-time B-mode scanner but is not present
in A-mode scanner?
A. Clock
B. Transmitter
C. Transducer
D. Scan converter
E. Receiver - (answers)D. Scan converter
, 2
Preprocessing functions may be defined as:
A. Any function that can be performed on a frozen image
B. A function that takes place in the beam former and is not controllable by the
operator
C. A function that allows increased focusing of the sound beam
D. A function that is performed before the echo data are stored in memory
E. Any function that changes the quality of the ultrasound image - (answers)D. A
function that is performed before the echo data are stored in memory
<Any function that occurs after this point is referred to as postprocessing. The
easiest way to distinguish pre- and postprocessing functions is this: If it can't be
performed on a frozen image, it is preprocessing; if it can be performed on a
frozen image, it is postprocessing>
You have decreased the scan line density. What technique will be employed to fill
in the empt data between the scan lines?
A. Interpolation
B. Rejection
C. Compression
D. Autocorrelation
E. Demodulation - (answers)A. Interpolation
, 3
<Interpolation is used to fill in the missing data between scan lines in both gray-
scale and color Doppler. The missing data are estimated from the data present in
nearby pixels on adjacent scan lines>
Which of the following ultrasound examinations would require the highest frame
rate?
A. Small parts
B. Abdominal
C. Pelvic
D. Vascular
E. Cardiac - (answers)E. Cardiac
<Since the heart is a rapidly moving structure, high frame rates are required to
assess it accurately>
A-mode display is most commonly used for what type of ultrasound imaging?
A. Small parts
B. Abdominal
C. Cardiac
D. Vascular
, 4
E. Ophthalmologic - (answers)E. Ophthalmologic
The spatial resolution of the scan converter is determined by:
A. Number of pixels in the scan converter matrix
B. Number of bits per pixel
C. The postprocessing settings
D. Brightness and contrast settings of the monitor
E. Interpolation scheme - (answers)A. Number of pixels in the scan converter
matrix
<A matrix of 512 x 512 pixels is capable of much better spatial resolution than a
similarly sized matrix containing only 64 x 64 pixels. In the latter example, the
image would appear blocky with discrete square-shaped segments. Image
resolution would be degraded>
A type of sonographic imaging that transmits two pulses of opposite phase in
rapid succession so they can be cancelled out upon reception is termed:
A. Pulse inversion harmonics
B. Compound imaging
C. Speckle reduction imaging
D. Tomographic imaging
