Creating the Digital Image
If the number of pixels is increased in a Matrix, image ______ will also increase.
Detail / Spatial Resolution
What does ADC stand for?
Analog-to-Digital Converter
How much of the IR must be exposed to avoid EI indicators?
30%
What does the vertical axes on a histogram demonstrate?
Number of Pixels
What is the graphic representation of all the pixel brightness values in the image in the order of their brightness?
Histogram
How many shades of grey can the human eye distinguish?
32
What is the path of the Lazer in the CR plate reader.
Raster Pattern
What is the exposure latitude for digital imaging?
-50% - +400%
(Histogram Picture)
What is area D called and what color is it?
When a digital image is excessively overexposed it's called...
Saturation
If a pixel has a bit depth of 10, how many shades of grey can it produce?
210 (1,024)
What system uses Amorphous Selenium?
Direct DR
What is the primary cause of scatter radiation?
Pt size, too much anatomy, poor collimation
(Histogram Picture)
Which area is representative of bony anatomy?
B
What is A made of?
(Image of PSP)
Plastic
What adjusts the range of densities displayed on the monitor?
Window Width
What is a popular scintillation material used in phosphor plates of Direct Radiography (DR) systems?
Cesium Iodide
A chest x-ray is obtained using 100kVp and 10mAs. If we want to reduce the exposure to 2.5mAs what will kVp need to be adjusted to?
130-135kVp
What does the computer compare the captured image histogram to in order to help produce an "ideal" image output?
Look-up Table
Which type of LUT does not have a tail.
Type 2
A narrow window width results in...
A High Contrast image.
What are the 4 steps in creating an image in a CR system?
Exposure
Stimulation
Read
Erase
Flipping the image left-right or top-bottom is an example of...
What is really graphed on a histogram?
Number of pixels at a given dencity.
What does D do?
(Image of PSP)
Reflects light toward the phosphor layer.