Window width in digitized radiography controls what image property?
What is contrast(grayscale)-inverse relationship
100
Window level controls what image property?
What is density(brightness)-direct relationship
100
Does a larger image matrix or a smaller image matrix offer better resolution?
What is a larger image matrix
100
The human eye can visualize up to how many shades of gray?
What is 32(5 bit)
200
True or False: Advantages of computed radiography (CR) over digital radiography (DR) include
1. CR is useful for mobile imaging.
2.CR is compatible with existing equipment.
What is True
200
Spatial frequency shows the number of times what?
What is a particular density is represented.
200
the processing operation, Image enhancement, does what?
What is improve image quality by sharpening and reducing image noise.
200
The processing operation, image restoration, does what?
What is corrects degradations by filtering out blur
200
The processing operation, image analysis, does what?
What is outlines and measures objects
300
What processing operation reduces the size of the image file to reduce storage space and reduce transmission time?
What is Image compression
300
The goal of a LUT(look up table) is to change image what?
What is Contrast
300
As the plate is scanned in the "reader," it releases a violet light—a process referred to as...
What is Photo-stimulated luminescence
300
The PSP can store the latent image for how long until it starts to show noticeable image fading?
What is 8 hours
300
After being scanned, the luminescent light is converted to what and is then sent to an ADC?
What is electrical energy
400
If you have the same FOV(field of view), as matrix size increase, pixel size _______, and image resolution ______?
What is decreases;increases
400
The violet light emited by the photostimulable phosphor (PSP) is transformed into the image seen on the CRT by the?
What is ADC(analog-to-digital converter)
400
1 pixel=? mm
What is .1 or 100 um
400
What are the 3 steps to digitizing an image?
What is scanning, sampling, and quantization
400
What happens to the image in the scanning step of digitizing?
What is the image is divided into an array of pixels.
500
What happens in the "sampling" step of digitizing an image?
What is measuring the brightness level of each pixel using special devices such as a PMT
500
What happens in the quantization step of digitizing an image?
What is The brightness levels obtained from sampling are assigned an integer. producing a gray-scale
500
Characteristics of digital radiographic imaging include
1. solid state detector receptor plates.
2. direct-capture imaging system.
3. immediate image display.
What is 1,2, and 3
500
DR does not use what?
What is cassettes
500
the solid state detector plates are made up of what compounds?