Radiology module 10 Flashcards
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Patient exposure to x-rays is — to
— % lower with digital x-rays
50-90%
Gray scale resolution is —- with digital film?
It has —– shades of gray compared to normal films —- shades of gray?
Higher
256
16-25
Resolution on digital film is
—-lp/mm compared to —- lp/mm on conventional film
10
12-20
The two types of digital imaging are?
Direct
Indirect
Direct digital is wired to a computer with either a — or—-
CCD charged coupling device
CMOS complementary metal-oxide semiconductor
The Two types of indirect digital systems are?
Scanning radiographs
Storage phosphor plate
The indirect digital phosphor system uses a — and —- to get images onto a computer
PPP or PSP
(photo-stimulable phosphor plate)
Laser beam scanner
Indirect digital (scanning) is —- to direct digital because?
Inferior
It is a “copy” of an original image
Indirect phosphor offers – size of film
Different
What are the 5 basic elements needed to take a digital x-ray?
X-ray machine Sensor or detector Analogue to digital converter Computer Monitor
Digital sensors are — sensitive to x-rays than conventional film?
(Do you need more/less radiation?)
More
Less
An —- image is captured by the digital sensor and then converted into —- that can be stored on the computer
Analog
Electronic pieces of data (digital)
Traditional film has — — in the emulsion that produce the image.
Digital sensors have —-
Halide crystals
Pixels
The silver halide crystals are arranged in what manner on the emulsion?
Randomly
In digital sensors the pixels are arranged how?
Each has a specific spot
Each pixel has a — — representing the — penetration of the object!
Gray level
Photon
Your eyes can only see — out of the 256 shades of gray on digital images
32
Digital imaging requires — impulses vs — impulses for a normal film
3
12
Most people feel like digital images do not equal film in regards to — and —
Sharpness
Detail
Exposure time for digital is approx. — of conventional film
Ie — impulses
1/2
3 (3/60 or .05 second)
A pixel is a — —
Picture element
A specific spot on the sensor
When an x-ray photon hits the pixel it is —- —.
Electronically charged
When the pixel is electronically charged it is done in proportion to what?
The number of electrons that react with that particular pixel
(electron potential well)
Major digital image software manufacturers have a built in — — to signal when an image has been altered
Audit indicator
Digital imaging will soon replace traditional films due to its —, —-,
—–, and —–
Speed
Enhancement capabilities
Electronic format
Benefits to patient and communication
