what year was digital radiography introduced to dentistry?
1987
T/F there is no film or processing chemistry used in digital radiography
true!
digital radiography uses an _________ sensor and __________ imaging that produces x-ray images almost instantly!
electronic
computerized
radiographic image produced by conventional film:
analog image
number of possible gray-scale combinations for each pixel (i.e. 8 bit-depth image has gray-scale combination of 2 to the 8th which equals 256 shades of gray)
bit-depth image
CCD: solid-state detector used in many devices (fax machine, home video camera); in digital radiography, CCD is an image receptor found in the intraoral sensor
charge-coupled device
filmless imaging system; a method of capturing a radiographic image using a sensor, breaking it into electronic pieces and presenting and storing the image using a computer
digital radiography
an image composed of pixels
digital image
a method of reversing the gray scale as an image is viewed.
digital subtraction
to convert an image into a digital form that in turn can be processed by a computer
digitize
obtaining a digital image in which an intraoral sensor is exposed to x-rays to capture a radiographic image that can be viewed on a computer monitor
direct digital imaging
obtaining a digital image in which an existing radiograph is scanned and converted into digital form using a CCD camera
indirect digital imaging
measurement used to evaluate the ability of the computer to capture the resolution (or detail) of a radiographic image
line pairs/millimeter (lp/ml)
a discrete unit of information; picture element
pixel
a small detector that is placed intraorally to capture a radiographoic image
sensor
obtaining a digital image in which the image is recorded on phosphor-coated plates and then placed into an electronic processor, where a laser scans the plate and produces an image on a computer screen
storage phosphor imaging
digital radiography requires _____ x-radiation than conventional radiography.
less
less x-radiation is necessary to form a digital image on the sensor because the typical sensor is ______ sensitive to x-rays than a conventional film
more
exposure times for digital radiography are _____ to _____ less than those required for digital radiography
50%-80%
T/F the use of specialized equipment is not necessary for digital radiography
FALSE! x-radiation source, intraoral sensor, and computer
T/F most dental radiography systems use a conventional dental x-ray unit as the x-radiation source
true!
what are the sizes of digital sensors?
0,1,2, and 4
what is one of the most common image receptors used in dental radiography?
CCD charge-coupled device
what are the three types of direct sensor technologies?
1. CCD
2. comementary metal oxide semiconductor/active pixel sensor
3. charge injection device
the _______ is a solid-state detector that contains a silicon chip with an electronic circuit embedded in it. this silicon chip is sensitive to x-rays or light
CCD
when was the CCD first developed?
1960s
a pixel is equivalent to what in conventional radiography?
a silver crystal
a small box or "well" into which the electrons produced by the x-ray exposure are deposited
pixel this
T/F as opposed to a film emulsion that contains an ordered arrangement of silver crystals, a pixel is structured in a random arrangement.
if you guessed false, it is false! film emulsion is random and a pixel is ordered
the CCD is _____X_____ individual pixels in size
640X480
the CCD contains 307,200 pixels and functions to sense ________ _______ and translate it into an _______ message
