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RADT311 Ch 13 & 14

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QuestionAnswer
What are the components of an image that can affect its visibility? Brightness or intensity, contrast, and noise
What is the proportional difference, or ratio, between the brightness of two adjacent details? Radiographic contrast
A radiograph of a step wedge portrays only very little differences from one density (brightness) to the next. What does this image posses? Low contrast & Long gray scale
The ideal degree of brightness for any image would be a ________ level. Optimum/Intermediate
A short gray scale indicated what kind of contrast? High
If there is misalignment of the x-ray beam, part, and image receptor results in what undesirable image quality? Shape distortion
What is the formula used to measure magnification? Magnification=SID/SOD
What is the formula used to measure Image Size vs Object Size in relation to SID and SOD? Image size/Object size=SID/SOD
What would be the equivalent to low penumbra? High Sharpness
What is undesirable input that interferes with the visibility of the subject of interest called? Noise
What is foreshortening a form of? Distortion
Insufficient penetration of what results in a silhouetted image of the object of interest? kVp
The complete or "true" image shadow of a radiographic image is called what? Umbra
What factors affect image unsharpness? SOD, OID, and focal spot size
What is the formula used to calculate unsharpness in a radiographic image? FS x OID/SOD
With an SID of 40 inches, and an OID of 10 inches, what is the factor of magnification? 1.33 X
What is the amount of unsharpness for a projection taken with a 0.5 mm focal spot, 150 cm SOD and 15 cm OID? 0.05 mm
The recognizability or geometrical functions in an image include what? Sharpness, magnification, and distortion
If penetration is sufficient, snow on an image and quantum mottle in digital imaging can be corrected by increasing mAS True
The difference between the size of a real object and the size of its projected image is defined as what? Magnification
Resolution of a radiographic system is measured in the form of what? line pair test with line pairs/mm
Given a focal spot size of 1.5mm, an OID of 20 cm, and an SID of 80 cm, what will the spread of unsharpness or penumbra measure? 0.5 mm
Created by: lrkelley
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