digital radiography Flashcards
digital imaging
any imaging acquisition process that produces an electronic image that can be viewed and manipulated on a computer
teleradiaology
moving images via telephone line to from remote locations
in the 1970s Godfrey Houndfield invented what
CT (computed tomography)
computed radiaography (CR)
cassette-based digital radiography, the digital acquisition modality that uses storage phosphor plates to produce projection images
when was CR first introduced commercially in the united states
1983
digital radiography (DR)
cassette-less systems use an x-ray absorber material coupled to a flat panel detector or a charged coupled device (CCD) to form the image
indirect capture digital radiography
absorb x-rays and convert them into light ; the light is read by a thin film transistor (TFT) or CCD array and then converted into an electrical signal that is sent to the computer for processing and viewing
direct capture digital radiography
devices convert in the incident x-ray energy directly into and electrical signal, typically using a photoconductor as the x-ray absorber and send the electrical signal to the computer for processing and viewing
what are most storage phosphor plates today made of
barium fluorohalide (where halide is bromine or iodine) with emporium as an activator
what color laser light is used to release the latent image
focused laser light
what is PACS
picture archival and communication system ; a networked group of computers, servers, and archives that can be used to manage digital images
computer
programable electronic device that can store, retrieve and process data
input devices
keyboards, mouse, microphones, barcode readers, touch screens, and image scanners
output devices
monitors, printers, speakers
CPU
central processing unit ; smal chip found on the motherboard ; brain of the computer
binary code
machine language of 1s and 0s
bit
single unit of date
byte
made up of 8 bits
motherboard
largest circuitry board inside the computer and it contains many important small components to make the computer function properly
BIOS
basic input/ouput system ; helps bring computer to life, runs start up diagnostics on the system to make sure all of the peripherals are functioning properly
the bus
a series of connections, controllers, and chips that creates the information highway of the computer ; allows for the information to flow within the computer
memory
used to store information currently being processed with in the CPU
RAM
short term storage for open programs
ports
collection of connectors sticking out of the back of the PC that link adapter cards, drives, printers, monitors, scanners,
hard drive
main repository for programs and documents on a PC
pixel
an individual controllable set of dot triads
resolution
the number of pixels on a display
matrix
a rectangular or square table of numbers that represents the pixel intensity to be displayed on the monitor
dot pitch
measurement of how close the dots are located to one another within a pixel
aspect ratio
ratio of the width of the monitor to the height of the monitor
operating system (OS)
the software that controls the computer hardware and acts as a bridge between applications and the hardware
LAN
local area network ; small area networked with a series of cables or wireless access points that allow computers to share information and devices on the same network
WAN
wide area network ; spans a large area city, state, nation, continent or the world.connect computers that are not physically attached to each other but rather connected through telephone lines, satellite links.
DICOM
digital imaging and communications in medicine
window level
controls how light or dark the image is
window width
controls the ratio of black to white or contrast
