EDELMAN CHAPTER 14 2026
ACTUAL QUESTIONS WITH VERIFIED
ANSWERS.
What is demodulation? - correct answer-a two-part process that
changes the electrical signals within the receiver into a form
more suitable for display on a monitor
What are the two parts of demodulation? - correct answer-
rectification: converts all negative voltages into positive
voltages
Smoothing (enveloping): places a smooth line around the
bumps in the voltage signal and evens them out
Is demodulation adjustable? - correct answer-no, demodulation
is built into the system and cannot be adjusted
What effect does demodulation have on the image? - correct
answer-demodulation has no visible effect on the image, its
purpose is to change the form of the electrical signal so that it is
appropriate for the system's display
,What is the function of reject? - correct answer-allows the
sonographer to control whether low-level gray scale information
within the data will appear on the displayed image
Low-level signals on the display may be associated with either
meaningful diagnostic information or meaningless noise
What are some synonyms for reject? - correct answer-threshold
and suppression
Is reject adjustable? - correct answer-yes, most ultrasound
systems have two levels of reject: one that is built into the
design of the system and cannot be changed, and one that is
user adjustable
What effect does reject have on the image? - correct answer-
low-level signals either appear in the image or are eliminated
from it (all low-level signals are affected, regardless of their
location)
Rejection does not affect bright echoes
, Summary of receiver functions - correct answer-amplification:
adjustable, all signals are treated identically, entire image
becomes brighter or darker
Compensation: adjustable, signals are treated differently based
on reflector depth, image will be uniformly bright from top to
bottom
Compression: adjustable, signals are treated differently
depending on strength, changes gray scale mapping of image
Demodulation: not adjustable, prepares electrical signals to be
suitable for display, no effect on image
Reject: adjustable, only affects weak signals, weak echoes
appear or are eliminated from the image
What is the function of the display? - correct answer-presents
processed data
The display may be a flat screen monitor, a transparency, a
spectral plot, or a variety of other formats
ACTUAL QUESTIONS WITH VERIFIED
ANSWERS.
What is demodulation? - correct answer-a two-part process that
changes the electrical signals within the receiver into a form
more suitable for display on a monitor
What are the two parts of demodulation? - correct answer-
rectification: converts all negative voltages into positive
voltages
Smoothing (enveloping): places a smooth line around the
bumps in the voltage signal and evens them out
Is demodulation adjustable? - correct answer-no, demodulation
is built into the system and cannot be adjusted
What effect does demodulation have on the image? - correct
answer-demodulation has no visible effect on the image, its
purpose is to change the form of the electrical signal so that it is
appropriate for the system's display
,What is the function of reject? - correct answer-allows the
sonographer to control whether low-level gray scale information
within the data will appear on the displayed image
Low-level signals on the display may be associated with either
meaningful diagnostic information or meaningless noise
What are some synonyms for reject? - correct answer-threshold
and suppression
Is reject adjustable? - correct answer-yes, most ultrasound
systems have two levels of reject: one that is built into the
design of the system and cannot be changed, and one that is
user adjustable
What effect does reject have on the image? - correct answer-
low-level signals either appear in the image or are eliminated
from it (all low-level signals are affected, regardless of their
location)
Rejection does not affect bright echoes
, Summary of receiver functions - correct answer-amplification:
adjustable, all signals are treated identically, entire image
becomes brighter or darker
Compensation: adjustable, signals are treated differently based
on reflector depth, image will be uniformly bright from top to
bottom
Compression: adjustable, signals are treated differently
depending on strength, changes gray scale mapping of image
Demodulation: not adjustable, prepares electrical signals to be
suitable for display, no effect on image
Reject: adjustable, only affects weak signals, weak echoes
appear or are eliminated from the image
What is the function of the display? - correct answer-presents
processed data
The display may be a flat screen monitor, a transparency, a
spectral plot, or a variety of other formats
