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RADT 465
ARRT registry review covering Equipment Operation & Quality Control and Image Ac
| Question | Answer |
|---|---|
| What are the 4 qualities to evaluate a radiographic image? | Brightness, contrast/gray scale. spatial resolution, distortion. Page 326 |
| What are the visibility factors? | Receptor exposure and contrast Page 326 |
| What is mAs directly proportional to? | Beam intensity, exposure rate, quantity, patient dose. Page 327 |
| What happens to exposure rate as SID increases? | Exposure decreases (inverse square law) Page 328 |
| Most important way to limit the production of scattered radiation to improve contrast? | Beam restriction Page 331 |
| Effect of high KV on patient dose? | higher KV decreases patient dose Page 333 |
| True of false. Protective filtration has an impact on receptor exposure. | False. no effect. Page 341 |
| What kind of filter may be used for chest radiography? | Trough filter page 343 |
| What happens to receptor exposure as field size increases | RE increases (scatter) page 345 |
| Does the thicker body part go under the cathode or anode? | Cathode page 344 |
| True or false: Generator type has no effect on receptor exposure or contrast. | True page 346 |
| What is defined as the volume of tissue that is represented in a pixel | Voxel page 347 |
| Window width controls | shades of gray page 348 |
| Window level controls | brightness page 348 |
| Fixed kV techniques are generally used with.. | AEC page 352 |
| Digital imaging can compensate for ___% underexposed and ___% overexposed | 80, 500 page 353 |
| Name the two types of AEC's | ionization chamber and phototimer page 354 |
| What describes the number of bits per pixel | bit depth page 357 |
| Grid absorption of the useful beam is | cut off page 358 |
| How is spatial resolution measured? | lp/mm page 361 |
| As FOV is decreased what happens to matrix size? | stays the same page 362 |
| Can noise be removed in post-processing? | No page 363 |
| What factors affect resolution? | OID, SID, Focal spot size, motion. patient factors page 363 |
| What effect does increasing SID have on geometric resolution | improves page 365 |
| Smaller focal spot size= _____ spatial resolution | better page 369 |
| Is effective focal spot larger or smaller than actual focal spot? | smaller page 372 |
| What has the greatest impact on image magnification? | OID page 327 |
| What describes the percentage of incoming x-ray photons that are identified and absorbed by the detector? | Detective quantum efficiency page 376 |
| As matrix size increases what happens to pixels | pixel size decreases page 376 |
| What 3 cycles does the PSP go through | x-ray exposure, reading, erasure page 386 |
| What information is required on an x-ray image? | Patient name/ID number, side marker, exam date, institution name page 382 |
| What os the graphical representation of pixel value distribution | histogram page 391 |
| What do LUT's do? | manipulate grayscale values to provide the appropriate grayscale rendition page 391 |
| The main difference between direct-capture and indirect capture DR is | direct capture/ conversion has no scintillator page 399 |
| Which layer of the PSP is responsible for directing emitted light toward the CR reader? | reflective layer page 399 |
| To eject a K-shell electron from a tungsten atom, the incoming electron must be at least | 70 keV page 418 |
| Which circuit operates on self-induction? | choke coil |
| What type of x-ray generate will produce the greatest voltage ripple | single phase, full wave recified |
| What is the relationship between wavelength and energy | inversely related page 418 |
| What is the relationship between frequency and energy | direct page 418 |
| Equipment operated above 70 kV must have ___ Al equivalent | 2.5 page 430 |
| Circuit devices that permit electrons to flow only in one direction are | solid-state diodes |
| The voltage ripples associated with a 3 phase, 12 pulse- rectified generator is about | 4% page 442 |
| what calculates the ratio of light photons at the output phosphor to the number at the input phosphor? | flux gain page 476 |
| Common causes of x-ray tube failure? | vaporized tungsten, pitted anode, cracked anode, gassy tube |
| HU formula | mA x time x kV page 426 |
| The width of the beveled focal track is called | actual focal spot page 424 |
| The 3 portions of the x-ray circuit | low voltage/primary circuit filament circuit high voltage/ seconday circuit page 440 |
| What part of the circuit can the x-ray tube be found? | High voltage circuit page 445 |
| What is the volume element | voxel page 446 |
| Saia, D.A. (2018). Equipment Operation and Quality Assurance. In S. Barnes, C. M. Thomas (Eds.), Radiography Prep (9th ed., pp. xxx-xxx).Chicago, IL: McGraw-Hill Education. | Saia, D.A. (2018). Image Acquisition and Technical Evaluation In S. Barnes, C. M. Thomas (Eds.), Radiography Prep (9th ed., pp. xxx-xxx).Chicago, IL: McGraw-Hill Education. |
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Almorphew
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