Final Review Flashcards
All of the following are examples of postprocessing except ____.
a. volume presentation
b. B color
c. read zoom
d. write zoom
d
An analog-to-digital converter is also called a ______.
digitizer
An increase in the number of channels _____.
allows more precise control of the beam characteristics
Averaging sequential frames improves ______/
dynamic range
Brightness mode is also called _____.
gray-scale
Contrast resolution depends on _____ of bits per pixel.
number
Displays have dynamic ranges up to ___ dB.
30
Filtering of the sound beam is used to eliminate _____.
frequencies outside of the bandwidth
Gain the ratio of ______.
amplifier output to input electric power
Holding and displaying one frame out of the sequence is known as ____.
freeze
If the operating frequency is reduced,
maximum penetration depth increases
In order to image deeper structures, the
PRF needs to be decreased
Increasing the frame rate improves
temporal resolution
Maximum amplifier gain is determined by
noise
Normally the number of channels does not exceed the number of _____
elements in the transducer
Pixel interpolation, persistence, and panoramic imaging are examples of
preprocessing
Retention of previous frames while new echo information is added in the same scanning plane is called
panoramic imaging
Storage of the last several frams acquired before freezing is called
cine loop
The ____ and ____ determine the maximum imaging depth.
attenuation; maximum amplifier gain
The ____ determines how much amplification is accomplished in the amplifier.
gain control
The _____ determines the brightness of the echoes on the display.
digital-to-analog converter
The direct(s) the driving voltages from the pulser to the transducer during transmission and directs returning echo voltages to amplifiers during reception.
transmit/receive switch
The _____ drive(s) the transducer forming the beam that sweeps through the tissue to be imaged
pulser
The _____ is where the action originates.
beam former