Digital Image Processing
2 types of Digital Radiography Systems
What is Digital and Computed Radiography
This determines pixel pitch
What is scanning frequency
The two DR panel classes
What is Indirect and Direct
15% rule applies to this system
What is Variable kVp system
Two types of Scintillators
What is Cesium Iodide
What is Gadolinium Oxysulfide
Using a higher technique to avoid quantum noise
What is Dose Creep
Common PSP Phosphors
What is Barium Fluorhalide Bromide
What is Barium Fluorhalide Iodide
Used in both indirect and direct detectors
What is TFT ( Thin Film Transistors)
Provides guidance for image quality
What is Target Exposure Indicator
Post processing consists of..
What is Frequency processing
What is spatial location processing
Determines the number of assigned shades of grey
What is Bit Depth
Prevents light from erasing data
What is the light shielding layer
Relationship between fill factor and spatial and contrast resolution
What is higher fill factor yields higher spatial and contrast resolution
In this system mAs changes in increments of 30%
What is Fixed kVp system
When an obtained image doe not match reference histogram
What is a histogram analysis error
Relationship between DQE and SNR
What is the electrons return their low energy state
Determined by percentage of DEL consisting of sensing material
What is fill factor
This is considered an ALARA violation
What is DI values +3 or greater
This determine bit depth
Calculations applied to small groups of pixels
What is Local Processing
Maintains the presence of electron holes in the PSP
What is Europium
What is CCD
Extreme overexposure can create this condition
What is Data Drop
This can happen when kVp is increased relating to the acquired data
What is create narrower data range
(Narrow histogram)