DAVIES ULTRASOUND PART2 EXAM
QUESTIONS WITH 100% CORRECT
ANSWERS LATEST VERSION 2025/2026.
What system control converts the numbers stored in memory to proportional voltage that
control the brightness on a CRT (cathode ray tube) monitor? - ANS Digital to analog converter
For display, the numbers stored in memory must be converted to proportional voltages to drive
the brightness of the monitor. Monitors are digital in modern ultrasound equipment
A digital scan converter is another name for what system component? - ANS Image memory
What control allows the user to freeze and then scroll back thru the most recently acquired
image frames? - ANS Cineloop
A group of 8 bits is called: - ANS Byte
Where are the images stored in the ultrasound system? - ANS Scan converter
What is the maximum number of shades of gray in an 8 bit digital scan converter? - ANS 256
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,An 8 bit system produces a maximum of 2 to the 8th power or 258 shades of gray. A 4 bit system
is capable of a maximum of 16 shades of gray, 5 bits-32 shades, etc. The more bits, the greater
the number of shades of gray.
The spatial resolution of the scan converter is determined by: - ANS Number of pixels in the
scan converter matrix
A matrix of 512 x 512 pixels is capable of must better spatial resolution than a similarly size
matrix containing only 64 x 64 pixels. In the latter example, the image would appear blocky w
discrete square-shaped segments. Image resolution would be degraded. The more pixels in the
scan converter matrix, the greater the spatial resolution
What system component is most responsible for transmit focusing? - ANS Beam former
Specifically, the transmit beam former, which introduces time delays into the excitation pulse
sequence applied to the elements
How many levels of information can a single bit represent? - ANS Two
A single bit can represent only 2 values, on and off. The earliest ultrasound systems showed only
1 bit of info.
The picture elements in a scan converter matrix are termed? - ANS Pixels
Digital to analog conversion of the ultrasound signal must occur at what part of the imaging
process? - ANS Between the scan converter and the display
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,In the scan converter, interpolation is performed to: - ANS Fill in the empty pixels that occur
between acoustic scan lines
Interpolation is necessary bc there is not data available for all pixels in the scan converter
matrix. As the line density i the ultrasound image is decreased, more interpolation becomes
necessary to fill in the image is decreased, more interpolation becomes necessary to fill in the
empty spaces. Although there are alot of different interpolation schemes used by different
manufacturers, in general the empty pixels are filled in w a value that is averaged between
adjacent pixels.
Without interpolation, which of the following would best describe the resultant B mode image?
- ANS A series of scan lines w blank data between the lines
Very early real time systems created images that looked like jail bars, in which the scan lines
were displayed but the space between each pair of scan lines were displayed but the space
between each pair of scan lines was left blank, Today, interpolation of the data is used to fill in
the blank spaces to make the image appears smooth and continuous, even though it is still
created by combining the values from surrounding scan lines
What 3 colors are used on a color monitor to produce the range of available colors? -
ANS Red, green and blue
These three colors are commonly referred to as the RBG signal
When you "freeze" the ultrasound image, where is the echo information stored? - ANS Scan
converter
The scan converter is the digital memory of the system
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What type of resolution is determine by the number of pixels in the scan converter? -
ANS Spatial
As the number of pixels increases, the spatial resolution of the image improves. The spatial
resolution can be no better than that obtained from the beam forming, but it can be worse
***Which of the following is associated w improper adjustment of the brightness and contrast
on the video monitor? - ANS The operator will likely over gain or under gain the image
The amount of gain the operator applies is subjectively determined by the appearance of the
image brightness, if the monitor is set too dark, the operator may over gain the image to
compensate for the dark monitor, If the monitor is too bright, the operator may under gain the
image to compensate
***What can you improve by changing the gray scale map? - ANS Contrast resolution
Which of the following describes an analog signal? - ANS Continuous variation of the signal is
possible
An analog signal does not have discrete steps. Its value may vary continuously between a
minimum and maximum point, Digital devices have discrete values that have fixed steps
between values. Bits determine the levels in a digital system
What is the order in which the signal travels in the ultrasound system? - ANS Txd, receiver,
scan converter, display
Of the following, which is the best choice to help you demonstrate tissue boundaries that are
not perpendicular to the sound beam? - ANS Spatial compounding
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS WITH 100% CORRECT
ANSWERS LATEST VERSION 2025/2026.
What system control converts the numbers stored in memory to proportional voltage that
control the brightness on a CRT (cathode ray tube) monitor? - ANS Digital to analog converter
For display, the numbers stored in memory must be converted to proportional voltages to drive
the brightness of the monitor. Monitors are digital in modern ultrasound equipment
A digital scan converter is another name for what system component? - ANS Image memory
What control allows the user to freeze and then scroll back thru the most recently acquired
image frames? - ANS Cineloop
A group of 8 bits is called: - ANS Byte
Where are the images stored in the ultrasound system? - ANS Scan converter
What is the maximum number of shades of gray in an 8 bit digital scan converter? - ANS 256
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,An 8 bit system produces a maximum of 2 to the 8th power or 258 shades of gray. A 4 bit system
is capable of a maximum of 16 shades of gray, 5 bits-32 shades, etc. The more bits, the greater
the number of shades of gray.
The spatial resolution of the scan converter is determined by: - ANS Number of pixels in the
scan converter matrix
A matrix of 512 x 512 pixels is capable of must better spatial resolution than a similarly size
matrix containing only 64 x 64 pixels. In the latter example, the image would appear blocky w
discrete square-shaped segments. Image resolution would be degraded. The more pixels in the
scan converter matrix, the greater the spatial resolution
What system component is most responsible for transmit focusing? - ANS Beam former
Specifically, the transmit beam former, which introduces time delays into the excitation pulse
sequence applied to the elements
How many levels of information can a single bit represent? - ANS Two
A single bit can represent only 2 values, on and off. The earliest ultrasound systems showed only
1 bit of info.
The picture elements in a scan converter matrix are termed? - ANS Pixels
Digital to analog conversion of the ultrasound signal must occur at what part of the imaging
process? - ANS Between the scan converter and the display
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,In the scan converter, interpolation is performed to: - ANS Fill in the empty pixels that occur
between acoustic scan lines
Interpolation is necessary bc there is not data available for all pixels in the scan converter
matrix. As the line density i the ultrasound image is decreased, more interpolation becomes
necessary to fill in the image is decreased, more interpolation becomes necessary to fill in the
empty spaces. Although there are alot of different interpolation schemes used by different
manufacturers, in general the empty pixels are filled in w a value that is averaged between
adjacent pixels.
Without interpolation, which of the following would best describe the resultant B mode image?
- ANS A series of scan lines w blank data between the lines
Very early real time systems created images that looked like jail bars, in which the scan lines
were displayed but the space between each pair of scan lines were displayed but the space
between each pair of scan lines was left blank, Today, interpolation of the data is used to fill in
the blank spaces to make the image appears smooth and continuous, even though it is still
created by combining the values from surrounding scan lines
What 3 colors are used on a color monitor to produce the range of available colors? -
ANS Red, green and blue
These three colors are commonly referred to as the RBG signal
When you "freeze" the ultrasound image, where is the echo information stored? - ANS Scan
converter
The scan converter is the digital memory of the system
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What type of resolution is determine by the number of pixels in the scan converter? -
ANS Spatial
As the number of pixels increases, the spatial resolution of the image improves. The spatial
resolution can be no better than that obtained from the beam forming, but it can be worse
***Which of the following is associated w improper adjustment of the brightness and contrast
on the video monitor? - ANS The operator will likely over gain or under gain the image
The amount of gain the operator applies is subjectively determined by the appearance of the
image brightness, if the monitor is set too dark, the operator may over gain the image to
compensate for the dark monitor, If the monitor is too bright, the operator may under gain the
image to compensate
***What can you improve by changing the gray scale map? - ANS Contrast resolution
Which of the following describes an analog signal? - ANS Continuous variation of the signal is
possible
An analog signal does not have discrete steps. Its value may vary continuously between a
minimum and maximum point, Digital devices have discrete values that have fixed steps
between values. Bits determine the levels in a digital system
What is the order in which the signal travels in the ultrasound system? - ANS Txd, receiver,
scan converter, display
Of the following, which is the best choice to help you demonstrate tissue boundaries that are
not perpendicular to the sound beam? - ANS Spatial compounding
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
