Digital Image Processing
This happens to spatial resolution as pixel size decreases
It increases
Where is the latent image stored when using CR?
Photostimulable Phosphor Plate
PSP
This effect emits a blue-purple light when the electrons return to a lower energy state after being freed from the F-centers
Photostimulable luminescence
Spatial resolution uses this unit in film screen
line pairs per millimeter
lp/mm
cycles per mm
Data drop is due to the saturation of this
DEL
Indirect conversion in digital radiography uses this to convert x-ray photons to light
Scintillator
This layer of the PSP plate prevents light from erasing data
Light shielding
How are pixel pitch and size related to spatial resolution?
Inversely
Spatial frequency maintains this type of relationship with spatial resolution
Direct
High spatial resolution = a high frequency (sin) wave (imaging smaller objects)
Low spatial resolution = a low frequency signal (imaging larger objects)
Technical factors (kVp and mAs) have a greater impact on contrast and density in this imaging system
Film screen
F/S
Photon starvation creates this type of image noise
Quantum mottle
Approximately 85% of PSP phosphors are made up of this
Barium fluorohalide Bromides
This feature in DR systems will allow you to select pre-programmed techniques for small, medium, and large adults
Anatomically Programmed Radiography (APR)
This is sometimes referred to as the fidelity or trueness of an image
Modular Transfer Function
MTF
Excessive exposure in DR improves image quality while adversely causing this (which is not ALARA compliant)
increase in patient dose
This represents the measurement of how sensitive and accurate incoming data is converted to output viewing
Detective Quantum Efficiency
DQE
In CR, the latent image is stored here
F-centers "electron traps"
Histogram analysis is considered this type of function in CR image processing
Pre-processing
What happens to spatial resolution as SID increases?
It increases
Fixed kVp systems are suitable for this type of receptor
digital
What happens to image contrast when the SNR is low?
It decreases
This pattern is used to scan the IP using a neon-helium laser
Raster pattern
This post-processing tool is used during scoliosis surveys and leg-length studies
Image Stitching
This formula is used to calculate the geometric unsharpness of an image
Penumbra = (Focal Spot Size x OID) / SOD
This is an extraneous piece of information on an image that does not truly represent the patient and their condition
An artifact