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Unit 2

Equipment Operation and Quality Control

QuestionAnswer
Is OID directly or inversely related to magnification? Directly. Also, OID is inversely related to recorded detail. pg. 301
Is SID inversely or directly related to magnification? Inversely. Also, SID is directly related to recorded detail. pg.301
Is recorded detail inversely or directly related to magnification? Inversely, recorded detail increases as magnification decreases pg. 301
What is the actual focal spot? The area on the target that is actually hit by the electrons from the filament. pg. 305
What is the effective focal spot? The foreshortened size of the focus as it projects downward. pg. 305
What intensifies the action of x-rays and permits the use of smaller exposures? Light photons pg. 311
What is the inverse square law used to calculate, with changes in SID? The new exposure rate pg. 320
What can be done instead when mAs cannot be changed to double the density? Use the 15% rule pg. 321
What is the most common way of expressing grid efficiency? Grid ratio and the number of lead strips per inch pg.329
What is subject contrast? The result of differential absorption by tissues of varying densities and thicknesses pg.339
What is the definition of exposure latitude? The margin of error available for a given group of exposure factors pg. 342
What is the master density control of AECs? Adjustable in increments of 25% pg. 351
What is signal-to-noise ratio used to describe? Contrast resolution pg. 356
What is the Detective Quantum Efficiency? The ability of the receptor material to perceive and interact with x-ray photons pg. 356
What increases CR resolution? Decreasing of PSP phosphor size, decreasing of laser beam size, and increasing of monitor matrix pg. 363
What affects pixel size? A change in matrix size, a change in FOV pg. 356
What improves CR spatial resolution? Smaller pixel pitch, greater pixels/mm, greater sampling frequency pg. 356
What are the advantages of SF systems? High spatial resolution, image consistency pg. 353
What are the factors that determine production of scatter radiation? Field size restriction, kilovoltage, thickness or volume and density of tissues pg. 344
What is SF subject contrast regulated by? The energy, wavelength, and penetrability of the x-ray photons pg. 339
Created by: cfdishon
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