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RADT 456 Liz Delong

Image Acquisition and Evaluation II

QuestionAnswer
What are the geometric factors of film screen and digital imaging pp.298 OID, SID, Focal spot size, Distortion, Structural position and shape, and motion
Recorded Detail pp. 298 Clarity or resolution with which anatomic structures are represented in the image
What is the term used for CR/DR recorded detail pp. 299 Spatial resolution
Distortion pp.299 Misrepresentation of the actual size or shape of the structures imaged
What is a border of unsharpness around image details pp. 305 focal spot blur or edge gradient
What is the purpose of intensifying screens pp.310 Reduce the required exposure to a fraction of the original exposure
What is the active ingredient in the intensifying screens pp.311 Fluorescent phosphors
Radiographic density pp.314 overall amount of blackening on a radiographic image
What is the signal most important technical factor associated with density? pp.317 mAs
What is the formula for the inverse square law pp. 319 I1/I2=d2^2/d1^2
What is the density maintenance formula pp. 319 mAs1/mAs2=d1^2/d2^2
Quality and Quantity of an x-ray beam is affected by what pp. 320 kV
What type of interaction is responsible for scattered radiation pp. 322 Compton interaction
What is grid ratio pp.326 the height of the lead strips compared with the distance between them
What type of environment and temperature should unexposed film be stored in? pp.381 cool and dry environment and under 70 F
Guide shoes or deflector plates allow fil to change direction. Guide shoes sometime leave marks, what are those marks called? pp.387 Guide shoe marks
What is a histogram pp.394 A graphic representation of pixel value distribution
Window width changes affect what? pp. 396 Changes in the number of gray shades
Window level changes affect what? pp. 396 Affects change in the image brightness
Windowing refers to what? pp.406 Some change made to window width and/or window level
Processing artifact pp.419 artifact caused by chemical processing of film
Wire mesh test pp.383 Screen must be tested periodically for screen-film contact
Dynamic range or pixel range is related to what? pp.355 shades of gray
Fixed kV technique chart pp352 A chart that specifies a particular kV for each body part or type of exam, it will provide adequate penetration and the appropriate scale of contrast
Additive pathology pp. 351 increases tissue density, requiring an increase in exposure factors
Atelectasis is an example of what type of pathology pp. 351 additive pathology
Degenerative pathology pp.351 deterioration of the part, requiring a decrease in exposure factors
An example of degenerative pathology pp.351 osteoporosis
What is the function of a grid? pp. 347 Removes scatter radiation exiting the patient before it reaches the IR, improving contrast
What are the 3 factors that have a significant effect on the production of scattered radiation pp.344 beam restriction, kv, and thickness and density of tissues
Created by: esdelong