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AdImQuiz3

Quiz3Mary

QuestionAnswer
Which process identifies "values of interest" in a radiograph Histogram analysis
Tell two of the many histogram analysis errors that can occur Extraneous exposure information including scatter, collimation margins not detected
Gradient curve is a representation of Image brightness and Contrast
Which processing operations (domain) is the histogram information sorted Intensity domain
Exposure latitude is defined as range of exposure that produces a quality image at an appropriate patient dose
List 3 domains in which a radiographic image can be processed Spatial, Intensity, and Frequency
What does the Y-axis represent in an image of a radiographic histogram Frequency of specific exposure values
What units are used to express resolution Line-pairs-per- millimeter (Lp/mm)
Whats spatial frequency if image has a matrix with a pixel size of 0.034 15 Lp/mm
As window level increases Brightness increases
Exposure indicator target ranges are inversely proportional, which manufacturer uses inverse proportional scale Fuiji and Phillips
Bit depth defined as total number of brightness levels that can be produced by the digital system
Dynamic range in radiographic imaging defined as range of exposures that can be captured by a detector
Which digital processes adjust the ORIGINAL histogram of a radiograph to match the expected histogram of a radiograph Rescaling
Rescaling- Brightness
LUTs Gray scale/Contrast
Sharpness- Pixel size
Magnification- Matrix size
An x-ray exposure above the level of the detectors dynamic range may result in an image error called Saturation
The process of "windowing" of digital detail determines the image Contrast
Which operation (domain) sorts by object detail Frequency domain
If an image has small structures what type of frequency should it represent with High frequency
Defined as a graphic representation of the pixel values Histogram
Processing a tib-fib as an abdomen may result in Incorrect brightness and contrast
Brightness and contrast resolution in digital imaging can be influenced by Window Level, Window Width, and LUT
Defined as difference in signal contribution (intensity) between 2 different image densities or tissue areas, divided by background noise level- Contrast-to-Noise-Ratio (CNR)
Process used to display digital image with ideal brightness and contrast LUT adjustments
In a histogram, what does x-axis represent specific exposure values captured by IR
Ability of an imaging system to demonstrate small details of an object is Spatial Resolution
Created by: Levanw
 

 



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