CR system Flashcards
What type of laser is used in a CR machine
A class 3B laser
What allows for high resolution images with high fidelity across the entire image in a CR machine
A flat scan path
What allows images to be stored in many different file formats while allowing users to adjust, view, print and transfer images all in one application
STARRview
What is known as the differences in the amount of absorbs energy from place to place in the plate (IP)
Contrast
What dictates spatial resolution of an image
Scanning process and IP type
The front screen (lead screen) is not required until energy reaches what KV range
150 to 160
How big of a lead screen should be used for back scatter prevention
1/8th inch
Exposure time should be what
As long as practical (without causing saturation)
All IP’s are what
Made of the same type of polyester plastic substrate as modern x-ray films unlike most x-ray films IP’s are all single-sided and the thickness of the sensitive layer is greater than for film emulsion layers
What is the normal wear out mechanism for IPs
Mechanical damage or abrasion
Blank resolution IP’s are needed for crack detection where blank resolution IP’s can be used for FOD
Higher and lower
The red laser light is focused to a small range of microns what is that range?
50-200 microns (50 microns equals .002 inch
what determines spatial resolution
The size of the laser light determines the smallest image features that can be possibly spatially resolved
What determines the actual image resolution limit
The blue emissions spot
What should the PMT voltage/gain sitting be set to
As low as possible without affecting steeple operation of the PMT
What is the process of changing the electrical signals emitted by the PMT into a visible representation that can be viewed as an image
Display conversion
The CR system A/E99D-3 is a portable CR system consisting of five major parts what are those parts?
Scanner (78 pounds) monitor (29 pounds) CPU (XX pounds) ABR (9.7 pounds) imaging plates
What are the power for the scanner
110 +/- 10 VAC, 50/60Hz or 23 +/- 10 VAC, 50/60Hz,
How many shades of gray?
65,535
What is the resolution of the monitor
2048 X 1536
How many hard drives
To
What is the maximum output power capacity for the AVR
1200 W or 1200 VA
What is the nominal output voltage for the AVR
110,120, or 127
How many outlets Does the AVR have
Four
What is the operating temperature of the AVR
32-104°F
What are the plate sizes
5 x 7, 10 x 12, 14 x 17,
What is the temperature range of the imaging plate
-40° - +120°F
What is the focal spot size of the laser
50 microns
what keeps the Red light from reaching the photomultiplier tubes (PMT)
Blue glass filters
What are five tools not intended for Navy or Marine Corps use
Density mapper calibrate gradient pipe gradient analysis calibrate 5 point sample dynamic ranging filter
What is the intensity scale the histogram
0 to 65,500
Up-and-down changes what? Left and right changes what?
Window and level respectively
The magnifier presents a simple how many times magnification?
Two times
Process control tests are split into what three types?
Display monitor tests
system tests
IP tests
