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Unit 2
Equipment Operation and Quality Control
| Question | Answer |
|---|---|
| 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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