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Radt456:Im. Acq.&Eva

ARRT Registry Review

QuestionAnswer
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