Physics Ch. 15-17 Flashcards
Bistable means
that the image is black and white
User controls for video monitors include
brightness and contrast
If an image has a high contrast is has ______ shades of gray
few
Analog numbers are
real world values, unlimited, exact number value
Smallest building block of a digital picture
pixel
Translates information for the spoke format received from the transducer to the video format
scan converter
Today’s ultrasound machines use ______ scan converters
digital
List the advantages of digital scan converters
- stability 2. uniformity 3. durability 4. accuracy 5. speed
Each pixel can display how many shades of grey
one
Smallest amount of computer memory
bit/binary digit
A byte is equal to _____ bits
8
Where does coded excitation occur
pulser
What all applies to write magnification
aquires new data, improved spatial res, same pixel size, pre processing and more pixels than the original ROI
PACS=
picture archiving and communications system
Means number of available choices
dynamic range
Represents the level below which information will not be displayed
threshold
If the fundamental frequency is 3.5 MHz, what is the harmonic frequency
7 MHz
Harmonic frequency sound arises from ______ behavior
non-linear
A ______ pixel density improves spatial resolution
high
What is persistence a synonym for
temporal compounding/temporal averaging
Which image processing technique is especially helpful to differentiate benign from malignant lesions
elastography
How many pulses are transmitted down each scan line with frequency compounding
one
Which imaging technique is used to create data where non existed
fill-in interpolation
Which image processing method only works with sector shaped images and improves spatial resolution
fill-in interpolation
