RADT 146 Exam Questions with100% Correct
Answers
Computed radiography (CR)
generic term applied to an imaging system composed of three parts: photostimulable storage
phosphor screen (PSP), CR reader, digital electronics
Photostimulable phosphor (PSP)
to acquire the x-ray projection (aerial) image
CR Reader
to extract the electronic latent image
Digital electronics
to convert the analog signals to digital form
Screen film imaging vs. CR
only difference is procressing
Screen-film: image manifested through chemical processing
CR: analog image converted into digital signal
Screen film process
xray beam, aerial image, intensifying screen (emits light), film (latent image), chemical
processing, manifest image
, When was CR commercially introduced
1983 by Fuji
Photostimulable luminance (PSL)
Enables phosphors to store x-ray energy temporarily and releases that energy upon excitation by
a laser beam
Imaging plate (IP)
where PSP screen is positioned
Commonly used phosphor material
barium fluorohalide
Erasing the Screen
A high intensity white light dumps all the remaining energy traps allowing the plate to be re-used
thousands of times
Additional Equipment
CR reader, laser printer, archive server, web server, film digitizer, imaging plates & cassettes,
QC workstation, diagnostic workstation/viewer
PSP is housed where
imaging plate (IP)
layers of PSP screen
protective layer, phosphor (active), support, reflective, backing
Answers
Computed radiography (CR)
generic term applied to an imaging system composed of three parts: photostimulable storage
phosphor screen (PSP), CR reader, digital electronics
Photostimulable phosphor (PSP)
to acquire the x-ray projection (aerial) image
CR Reader
to extract the electronic latent image
Digital electronics
to convert the analog signals to digital form
Screen film imaging vs. CR
only difference is procressing
Screen-film: image manifested through chemical processing
CR: analog image converted into digital signal
Screen film process
xray beam, aerial image, intensifying screen (emits light), film (latent image), chemical
processing, manifest image
, When was CR commercially introduced
1983 by Fuji
Photostimulable luminance (PSL)
Enables phosphors to store x-ray energy temporarily and releases that energy upon excitation by
a laser beam
Imaging plate (IP)
where PSP screen is positioned
Commonly used phosphor material
barium fluorohalide
Erasing the Screen
A high intensity white light dumps all the remaining energy traps allowing the plate to be re-used
thousands of times
Additional Equipment
CR reader, laser printer, archive server, web server, film digitizer, imaging plates & cassettes,
QC workstation, diagnostic workstation/viewer
PSP is housed where
imaging plate (IP)
layers of PSP screen
protective layer, phosphor (active), support, reflective, backing
