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RADT 465

Image production and Evaluation

QuestionAnswer
What pixel size has a 512x512 matrix with a 20 cm field of view (FOV)? (pg 195) .40mm/pixel
Grid interspace material can be made of? (196) aluminum and plastic fiber
The x-ray tube used in CT must be capable of? (pg 196) high-speed rotation, short pulsed exposures, withstanding millions of heat units
The component of a CR image place that records the radiologic image is the? (pg 197) photostimulable phosphor
The luminescent light emitted by the PSP is transformed into the image seen on the CRT by the? (pg 197) ADC
The term windowing describes the practice of? (pg 198) changing the image brightness and/or contrast scale
Foreshortening can be caused by? (pg 198) The radiographic object being placed at an angle to the IR
Using fixed mAs and varable KV technical factors, each centimeter increase in patient thickness requires what adjustment in KV? (PG 199) increase 2 kV
Unopened boxes of radiographic film should be stored away from radiation and...? (pg 199) in the vertical position
If a duration of 0.05 second was selected for a particular exposure, what MA would be necessary to produce 30 mAs? (pg 199) 600
X-ray photon energy is inversely related to...? (pg 199) photon wavelength
What affect the exposure rate of the primary beam? (pg 201) mA, kV, distance
Misalignment of the tube-part-IR relationship results in? (pg 203) shape distortion
A particular radiograph was produced using 12 mAs and 85 kVp with a 16:1 ratio grid. The radiograph is to be repeated using an 8:1 ratio grid. What should the new mAs value? (pg 204) 8
The main difference between direct capture and indirect capture DR is that...? (pg 205) direct capture/conversion has no scintillator
The direction of electron travel in the x-ray tube is? (pg 205) cathode to anode
For the same FOV, spatial resolution will be improved using? (pg 205) a larger matrix
The absorption of useful radiation by a grid is called? (pg 206) grid cutoff
A 15% decrease in KV accompanied by a 50% increase in mAs will result in? (pg 207) shorter scale of contrast
Focal-spot blur is greatest where? (pg 207) toward the cathode end of the x-ray beam
How are mAs and patient dose related? (pg 207) mAs and patient dose are inversely proportional
What is the correct order of radiographic film processing? (pg 209) developer, fixer, wash, dry
The reduction in x-ray photon intensity as the photon passes through material is termed? (pg 209) attenuation
If a lateral projection of the chest is being performed an asthenic patient and the outer photocells are selected, what is likely to be the outcome? (pg 210) decreased density
Which device is used to overcome severe variation in patient anatomy or tissue density, providing more uniform radiographic density? (pg 210) compensating filter
The intensity of ionizing radiation decreases as...? (pg 211) distance from the source of radiation increases
The process of "windowing" of digital images determines the image...? (pg 213) contrast
What is the purpose of the thin layer of lead that is often located in the rear portion of an IP? (PG 213) to prevent scattered radiation fog
The purpose of the electroconductive later of a CR PSP plate is to? (pg 213) facilitate transportation through the scanner/reader
What pixel size has a 2,048x2,048 matrix with a 60cm FOV? (pg 213) 0.3mm
The x-ray image seen on the computer display monitor is a? (pg 214) analog image
A focal-spot size of 0.3 mm or smaller is essential for? (pg 214) magnification radiography
Created by: mnzeilinga