Chapter 8 Digital radiography Flashcards
In digital film is replaced with
Digital imagibe receptor
Digital imaging is composed of
structurally ordered pixels
More pixels an imagine has means
high resolution and it is sharp
spatial resolution is determined by the number of
pixels
Number of shades of gray visible in an image
Probably most important characteristic of radiographic
image
gray scale
how many gray levels can be on a monitor
256
how many can the human eye see
32
DC machines may produce more
DC machines may produce more consistent
exposures at short exposure times associated with
digital radiography.
what are the 2 types of digital imaging receptors
Direct
indirect
Direct (Digital Sensors)
narrow dynamic range
instant viewing
thick sensors
durable
increased spatial resolution
indirect (Phosphor plates)
Wide dynamic range
needs to be scanned
smaller size
easily damaged
requires additional time to prepare
decreased spatial resolution
indirect digital imaging replaces film with
photostimulable phosphorus plates with no wire to a computer
direct imaging uses what sensors
electronic sensors to produce an image
what are digital sensors made of
pixels in rows
what is ccd
charged coupled device
what is cmos-aps
complementary metal oxide semiconductor active pixel sensor
can be wired or wireless
digital sensors
what are PSP plates
Phosphorus plates
made of polyester coated with storage phosphor( europium activated barium fluorohalide)
PSP are placed in
Laser scanning device
PSP captures and stores
xray energy as an image
What is the laser beam
Helium neon
