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RADT 456
ARRT registry review covering Image Acquisition and Evaluation
| Question | Answer |
|---|---|
| What are the radiographic geometric factors? | Recorded detail and distortion. Pg. 296. |
| What are the photographic factors for radiology? | Density and contrast. Pg. 316. |
| Spatial resolution is measured in what? | Line pairs per millimeter (lp/mm). Pg. 296. |
| Does unsharpness increase as focal spot size increases or decreases? | Unsharpness increases as focal spot size increases. Pg. 303. |
| Is there more unsharpness at the cathode or anode end of the tube? | Cathode end. Pg. 304. |
| Is the effective focal spot smaller or larger than the actual focal spot? | The effective focal spot will always be smaller than the actual focal spot per the line focus principle. Pg. 307. |
| What is the best method of minimizing voluntary motion? | Good communication and suspended respiration. Pg. 307. |
| When and who developed the calcium tungstate intensifying screen? | Thomas Edison in 1896. Pg. 308. |
| Do phosphors with a high atomic number have a slower or greater speed? | They have a greater speed. Pg. 311. |
| If phosphor size increases, does screen speed increase? | Screen speed and phosphor size are directly related. The bigger the phosphor the faster the screen speed. Pg. 312. |
| Is there better recorded detail with a faster or slower screen speed? | As screen speed increases, recorded detail decreases. Pg. 312 |
| If the mAs is doubled, what happens to the density? | The density doubles as well. Pg. 319. |
| To produce a perceptible change in density, how much would the mAs have to change? | The mAs would have to change at least 30%. Pg. 319. |
| Is mAs directly/indirectly proportional to the distance squared? | The mAs is directly proportional to the distance squared. Pg. 320. |
| If twice the original density is needed, what percentage should kV be increased? | You would need to increase the kV by 15% to see a increase in density. Pg. 323. |
| What is the single most important way to reduce scatter radiation? | Collimation. Pg. 325. |
| When is the use of a grid recommended? | For body parts measuring 10 cm or greater. Pg. 325. |
| If no grid is used on a large body part, what percentage of scatter radiation contributes to the total IR exposure? | 50% of the image is scatter radiation. Pg. 326. |
| What is grid ratio? | Grid ratio is the height of the lead strips compared with the distance between them. Pg. 328. |
| What is grid frequency? | Grid frequency is the number of lead strips per inch. Pg. 329. |
| What grid ratio is recommended for radiography up to 90kV? | 8:1 Grid. Pg. 330. |
| A 10 inch air-gap produces the same effect as what type of grid? | A 16:1 grid. Pg. 331. |
| The glass tubes accounts for how much filtration of the primary beam? | 0.5 mm Al equivalent. Pg. 332. |
| The collimator box accounts for how much filtration of the primary beam? | 1.0 mm Al equivalent. Pg. 332. |
| Give three examples of destructive pathologies that technique may need to be reduced. | Emphysema, degenerative arthritis, and osteoporosis. Pg. 335. |
| Give three examples of additive pathologies that technique may need to be increased. | Ascites, pneumonia, and atelectasis. Pg. 335. |
| When changing from single phase to three phase 12 pulse, what decrease of mAs is needed? | Cut the mAs in half. Pg. 338. |
| Does optical density increase/decrease as developer temperature increases? | Optical density increases. Pg. 341. |
| What is the function of contrast scale? | To make image details visible. Pg. 342. |
| Is there a larger or smaller margin of error when selecting higher kV? | There is a larger margin for error. Pg. 345. |
Created by:
burton08L
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