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RADT 465
Image Production
| Question | Answer |
|---|---|
| Magnification factor= | input phosphor 1/ input phosphor 2 |
| Magnification factor= | SID/SOD |
| Magnification factor= | image size/object size |
| Minification factor= | input squared/output phosphor squared |
| Flux gain= | output size/input size |
| Brightness gain= | minification factor x flux gain |
| Increase kVp by 15%, _____ the mAs by 2. | divide |
| Percentage of magnification= | image size-object size/object size x100 |
| Unsharpness formula= | filament size x OID/SOD |
| Single phase generator= | 1 multiplier |
| Three phase six pulse generator= | 1.35 multiplier |
| Three phase 12 pulse generator= | 1.41 multiplier |
| decrease in exposure over the entire image | off center |
| decrease in exposure over the entire image | off level |
| periphery of image will be lighter | off focus |
| This will only show a portion of the image and the periphery of the image will be completed white | inverted/upside down grid |
| This allows for images to fall within an acceptable range on a mixed/ diverse population of patients | AEC |
| incoming electron slows down around the nucleus in the target atom | Bremsstrahlung interaction |
| incoming electron interacts with an inner shell electron in the target atom | Characteristic interaction |
| With a three phase, six pulse generator, there is a _____ voltage ripple | 13-14% |
| With a three phase, 12 pulse generator, there is a ______ voltage ripple | 3-4% |
| There are ____ cycles of sinusoidal wavelengths per 1 sec in the United States | 60 |
| controlled by kV, energy, penetrability of the beam | quality |
| controlled by mAs, amount of photons, rate of exposure | quantity |
| radiation that exits from the tube | permanent |
| radiation that exits from the patient | remnant |
| What are the fundamental properties? | heterogenous, polyenergetic, travels at the speed of light, ionizing, no mAs, high frequency, low wavelengths, EMS spectrum |
| As frequency increases, wavelength _____ and energy _____. | decreases, increases |
| As filtration increases, scatter ____ and contract ____. | increases, deacreases |
| As beam restriction increases, field size ____, scatter ____, and contrast ____. | decreases, decreases, increases |
| Do you want a high or low scale of contrast? | high |
| If you increase kVp, then scatter will ____. | increase |
| As OID increases, scatter _____, SID _____, and contrast ____. | decrease, increase, increase |
| As DQE goes up, the patient dose goes ____. | down |
| If you have a higher DQE, will you use more or less technique? | less |
| Exposure index is _____ proportional to the exposure of the image receptor. | directly |
| S-number is ______ proportional to exposure of the image receptor. | inversely |
| If you double the distance, the intensity at the image receptor will be _____ by a factor of ____. | decreased, 4 |
| A 14x17 field size has a multiplier of ____. | 1 |
| A 10x12 field size has a multiplier of _____. | 1.25 |
| A 8x10 or 9x9 field size has a multiplier of _____. | 1.40 |
| A change in field size affects both ____ and _____. | density and contrast |
| As the target angle increases, then the effective focal spot _____. | increases |
| Supplies alternating current to the circuit | AC supply |
| Connects external power supply to the x-ray circuit unit | master wall switch |
| The first meter that will read the incoming line voltage and will work with the line voltage compensator. | line voltage meter |
| Has to have the alternating current in order to work, helps with getting a precise 220 volts, only has one winding, and runs on self-induction | autotransformer |
| calculates an estimate of what the kVp outcome will be | pre-reading kV meter |
| closes the circuit, which makes the x-rays fire | exposure switch |
| controls the duration of the exposure | exposure timer circuit |
| regulates the amperage going to the filament circuit | mA selector |
| changes the alternating current into direct currect | diodes for rectification |
| rectification from the alternating current to the direct current happens on the secondary side | high voltage side (secondary side) |
| receives remnant radiation that exits out of the patient and converts it to an electrical signal | radiation detector technology |
| this should never be set more than 150% of the anticipated exposure | back-up timer |
| this is set by mAs, it is a safety mechanism | back-up timer |
| increase or decrease the amount of radiation received based on the patient size adjustment. | density adjustment |
Created by:
MariahKesterson
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