Understanding Ultrasound Physics
Chapter 15 Exam Questions with Correct
Answers
bistable image - ANSWER-composed of only two shades: black and white
contrast - ANSWER-___ determines the range of brilliance within the displayed image.
Bistable images, in which only white and black appear, are high ___.
brightness - ANSWER-determines the brilliance of the displayed image.
scan converter - ANSWER-translates the information from the spoke format into the
video format. Also known as the memory.
digital scan converters - ANSWER-uses computer technology to convert the image
information into numbers. This is called digitizing.
analog numbers - ANSWER-"real world" numbers that are found in our everyday lives
digital numbers - ANSWER-associated with computer devices and have discrete values
pixel, bit - ANSWER-two important elements of digital scan converters
image fade, image flicker, instability, deterioration - ANSWER-Analog scan converters
are now obsolete because of which four limitations?
image fade - ANSWER-stored charges on the silicon wafer dissipate over time
image flicker - ANSWER-caused by switching between read and write modes
instability - ANSWER-picture quality depends on many factors including length of use,
room temperature, and humidity
deterioration - ANSWER-what is it called when an image degrades as the device ages?
uniformity, stability, durability, speed, accuracy - ANSWER-What are the five
advantages of digital scan converters?
uniformity - ANSWER-an advantage of digital scan converters that consistent gray scale
quality throughout the image
stability - ANSWER-an advantage of digital scan converters that does not fade or drift
, durability - ANSWER-an advantage of digital scan converters that is not affected by age
or heavy use
speed - ANSWER-an advantage of digital scan converters that consists of nearly instant
processing.
accuracy - ANSWER-an advantage of digital scan converters that is error free
pixel - ANSWER-Combination of picture and element. The smallest building block of a
digital picture.
pixel density - ANSWER-the number of picture elements per inch
spatial resolution - ANSWER-what improves with high pixel density and creates an
image with greater detail?
low pixel density - ANSWER-few pixels per inch, larger pixels, less detailed image,
lower spatial resolution
high pixel density - ANSWER-many pixels per inch, smaller pixels, more detailed image,
higher spatial resolution
bit - ANSWER-derived from the term "binary digit", is the smallest amount of computer
memory. Is bistable, having a value of either 0 or 1.
binary number - ANSWER-a group of bits and is simply a series of zeroes and ones,
such as 0101010011.
8 - ANSWER-a byte equals how many bits?
16 - ANSWER-word equals how many bits?
analog to digital converter - ANSWER-when analog signals from the transducer are
changed to digital form and stored in computer memory.
digital to analog converter - ANSWER-A device that converts digital data (computer
world), such as 1s and 0s, into an analog form (real world). Presented on the analog
video display for interpreation.
preprocessing - ANSWER-The manipulation of image data before storage in the scan
converter.
postprocessing - ANSWER-The manipulation of image data after storage in the scan
converter. Any alterations to a frozen image must be ___.
preprocessing - ANSWER-time gain compensation (TGC)
Chapter 15 Exam Questions with Correct
Answers
bistable image - ANSWER-composed of only two shades: black and white
contrast - ANSWER-___ determines the range of brilliance within the displayed image.
Bistable images, in which only white and black appear, are high ___.
brightness - ANSWER-determines the brilliance of the displayed image.
scan converter - ANSWER-translates the information from the spoke format into the
video format. Also known as the memory.
digital scan converters - ANSWER-uses computer technology to convert the image
information into numbers. This is called digitizing.
analog numbers - ANSWER-"real world" numbers that are found in our everyday lives
digital numbers - ANSWER-associated with computer devices and have discrete values
pixel, bit - ANSWER-two important elements of digital scan converters
image fade, image flicker, instability, deterioration - ANSWER-Analog scan converters
are now obsolete because of which four limitations?
image fade - ANSWER-stored charges on the silicon wafer dissipate over time
image flicker - ANSWER-caused by switching between read and write modes
instability - ANSWER-picture quality depends on many factors including length of use,
room temperature, and humidity
deterioration - ANSWER-what is it called when an image degrades as the device ages?
uniformity, stability, durability, speed, accuracy - ANSWER-What are the five
advantages of digital scan converters?
uniformity - ANSWER-an advantage of digital scan converters that consistent gray scale
quality throughout the image
stability - ANSWER-an advantage of digital scan converters that does not fade or drift
, durability - ANSWER-an advantage of digital scan converters that is not affected by age
or heavy use
speed - ANSWER-an advantage of digital scan converters that consists of nearly instant
processing.
accuracy - ANSWER-an advantage of digital scan converters that is error free
pixel - ANSWER-Combination of picture and element. The smallest building block of a
digital picture.
pixel density - ANSWER-the number of picture elements per inch
spatial resolution - ANSWER-what improves with high pixel density and creates an
image with greater detail?
low pixel density - ANSWER-few pixels per inch, larger pixels, less detailed image,
lower spatial resolution
high pixel density - ANSWER-many pixels per inch, smaller pixels, more detailed image,
higher spatial resolution
bit - ANSWER-derived from the term "binary digit", is the smallest amount of computer
memory. Is bistable, having a value of either 0 or 1.
binary number - ANSWER-a group of bits and is simply a series of zeroes and ones,
such as 0101010011.
8 - ANSWER-a byte equals how many bits?
16 - ANSWER-word equals how many bits?
analog to digital converter - ANSWER-when analog signals from the transducer are
changed to digital form and stored in computer memory.
digital to analog converter - ANSWER-A device that converts digital data (computer
world), such as 1s and 0s, into an analog form (real world). Presented on the analog
video display for interpreation.
preprocessing - ANSWER-The manipulation of image data before storage in the scan
converter.
postprocessing - ANSWER-The manipulation of image data after storage in the scan
converter. Any alterations to a frozen image must be ___.
preprocessing - ANSWER-time gain compensation (TGC)
