Computed Radiography
1
1
Computed Radiography
2
2
Computed Radiography
3
3
Computed Radiography 4
Computed Radiography 5
100
The phosphor used in Computed Radiography image receptors
What is Barium Flourohalide (Bromide or Iodide)
100
This is the collection element in a CR image receptor
What is a photodetector?
100
This is the name for the process in which the laser beam scans across the imaging plate
What is translation?
100
50-200 µm
What is the average laser beam diameter in a CR reader?
100
Emitted light is the ____________; stimulating light (laser) is_____________.
Signal;Noise
200
The release of stored energy within a phosphor by stimulation with visible light
What is photostimulable phosphorescence?
200
Blue Violet
What is the light emitted when electrons in the SPS return to ground state?
200
These 2 things are part of the analog-to-digital (ADC) conversion process
What are Quantization and Sampling?
200
This is the characteristic of the PSP layer that will cause the laser beam to spread
What is thickness?
300
Causes the SPS to appear white
What is scattering of light by the storage phosphor screen?
300
Helium Neon Red
What is the color of the CR laser beam?
300
This is the purpose of the Barium Fluorohalide doped with Europium
What is to trap electrons?
300
Approximately ___________of the electrons return to the ground state immediately after exposure to x-rays
What is 50%?
400
Turbid
The excessive scattering of light
400
This keeps beam size, shape, speed, and intensity of the laser beam
What are the beam shaping optics?
400
This is a higher energy state
What is metastable?
400
This may be black to reduce spread of stimulating light and the escape of stimulated light
What is the reflective layer?
500
Electrostatically protected and mechanically stable
What is the storage phosphor screen?
500
What is metastability?
500
Some storage phosphor screens incorporate this to increase the absorption of x-rays and limit the spread of stimulated emission, or turbid.
What are phosphors grown as linear filaments?
500
The laser light is the _________light and the light released when the phosphors are stimulated with a laser is the __________________ light
What is stimulating and stimulated?