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Radt456:Im. Acq.&Eva
ARRT Registry Review
| Question | Answer |
|---|---|
| What pixel size has a 512x512 matrix with a 20cm. field of view? | .40mm/pixel (pg. 195) |
| Grid interspace material can be made of what? | Aluminum and Plastic Fiber (pg. 196) |
| Decreasing field size from 14x17 in. to 8x10 in, with no other changes, will do what? | Decrease the amount of scattered radiation generated within the part. (pg. 197) |
| what's the function of the photostimulable phosphor? | Component of the CR imaging plate that records the radiologic image. (pg. 197) |
| The term windowing describes the practice of what? | Changing the image brightness and/or contrast scale. (pg. 198) |
| Foreshortening can be caused by what? | The radiographic object being placed at an angle to the IR (pg. 198) |
| X-ray photon energy is inversely related to what? | Photon Wavelength (pg. 199) |
| Compared with a low-ratio grid, a high-ratio grid will do what? | Absorb more scattered radiation and primary radiation. (pg. 200) |
| Image contrast is a result of what? | Differential tissue absorption and atomic number of tissue being traversed. (pg. 201) |
| In comparison with 60kV, 80kV will what? | Permit greater exposure latitude and produce more scattered radiation. (pg. 203) |
| Misalignment of the tube-part-IR relationship results in what? | Shape Distortion (pg. 203) |
| Chemical fog may be attributed to what? | Excessive developer temperature, oxidized developer and excessive replenishment (pg. 204) |
| Using a 48 in. SID, how much OID must be introduced to magnify an object two times? | 24 in. OID (pg. 204) |
| The main difference between direct capture and indirect capture DR is that what? | Direct capture/conversion has no scintillator. (pg. 205) |
| What is grid cutoff? | the absorption of useful radiation by a grid. (pg. 206) |
| Pathologic or abnormal conditions that would require a decrease in exposure factors include what conditions? | Osteoporosis, Osteomalacia, pneumoperitoneum, emphysema, degenerative arthritis, and atrophic and necrotic conditions. (pg. 207) |
| Pathologic or abnormal conditions that would require an increase in exposure factors include what conditions? | Ascites, rheumatoid arthritis, paget disease, pneumonia, atelectasis, congestive heart failure, and edematous tissue. (pg. 245) |
| Focal spot blue is greatest when? | Towards the cathode end of the x-ray beam (pg. 207) |
| How are mAs and patient dose related? | mAs and patient dose are directly proportional (pg. 207) |
| An increase in the kilovoltage applied to the x-ray tube increases the: | Exposure rate (pg. 209) |
| Diagnostic x-rays are generally associated with what? | High frequency and short wavelength (pg. 210) |
| HVL is affected by the amount of what? | kVp and Beam filtration (pg. 212) |
| Bone densitometry is often performed to: | Measure degree of bone (de) mineralization and evaluate the results of osteoporosis treatment/therapy (pg. 212) |
| The exposure factors of 400 mA, 17ms, and 82kV produce a milliampere-seconds value of: | 6.8 (pg. 214) |
| In digital imaging, as DEL size decreases: | spatial resolution increases (pg. 216) |
| The processing algorithm represents what? | Anatomical part and projection (pg. 217) |
| A QA program serves to: | Keep patient dose to a minimum, Keep radiographic quality consistent and ensure equipment efficiency (pg. 221) |
| Exposure-type artifacts include: | Double exposure and motion (pg. 223) |
| A grid ratio is decreased, | the scale of contrast becomes longer (pg. 225) |
| How often are radiographic equipment collimators required to be evaluated? | Semiannually (pg. 226) |
| Grid cutoff due to off-centering would result in: | Overall loss of density (226) |
| Distortion can be caused by what? | tube angle, position of the organ or structure within the body, and the radiographic positioning of the part (pg. 229) |
| As window level increases, | Brightness increases (pg. 229) |
Created by:
arsturgill
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