Digital imaging week 3 Flashcards
what are the physical components of computer and an ex
Hardware
keyboard, CPU, monitor
what is a computer programs and a few examples
software
word, OS
what is used to input info and an example
Input device
keyboard
what is used to output info. to user and an ex
output device
monitor
what is used to store info and an ex
storage device
flash drive, hard drive
What does RAM stand for
random access memory (temporary)
What does ROM stand for
read only memory (permanent)
2 types of computer network
WAN and LAN
what is WAN and an ex
wide area network
internet
what is LAN and an ex
local area network
intranet
the binary system operate with a
2 symbol alphabet
0= & 1=
off
on
bit=
0 or 1
byte=
8 bits
kilobyte=
1024 byte
Megabyte=
1 million byte
Gigabyte=
1 billion byte
Terabyte=
1 thousand billion bytes
each binary digit is called a
bit
an 8 word bit is a
byte
what is an algorithum
systematic application of highly complex mathematical formulas
Algorithms are essential to the way computers _ why?
process info
the computer program is essentially an algorithm that tells the computer what specific steps to perform in order to carry out a specified task
what is a compression technique achieved by compressing a range of values to a single quantum value
quantization
by reducing the # of discrete symbols in a given stream, the stream becomes
more compressible
compression is used to _
free up data space
compression is a process of converting a into a coded image then converting a into a decoded image known as _ method
raw image
coded image
compression method
what is the purpose or compression
to make the coded image as small as possible
the decoded image has to be acceptably close to the
raw image
if the decoded image is identical to the raw image (reversible); lower compression levels
lossless
if the decoded image differs from the raw image (irreversible); higher compression levels
Lossy
process of partitioning a digital image into multiple regions (sets pixel)
segmentation
what is the goal for segmentation
to simplify &/or change the representation of an image into something that is more meaningful and easier to analyze
segmentation is typically used to locate
objects and boundaries (lines, curves, etc)
Digital Radiography is an image produced w/either a _ beam intercepted by a _or an x-ray beam intercepted by a
fan x-ray beam
linear array of radiation detectors
photostimulable phosphor plate or a direct capture solid-state device
Teleradiography is the transmission of
patients images from one location to another for the purpose of sharing studies with other physicians
Teleradiography improves care by allowing radiologists to
provide services w/out being at the location
Teleradiography is used through
internet, phone, WAN, and LAN
