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RADT 465
Image production and Evaluation
| Question | Answer |
|---|---|
| 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
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