MICC PRACTICE TEST CH.8 Flashcards
Which of the following affects the severity of metal artifacts?
A. The quantity, composition, & shape of the metal.
B. The slice thickness.
C. The number of data sampling points.
D. All of the above.
D - All of the above.
Which of the following may occur if the pts arms are placed at their sides during a chest exam if the scan field of view is 33 cm?
A. Beam hardening.
B. Out-of-field artifact.
C. Cone beam artifact.
D. A & B only.
C. All of the above.
B - Out of field artifacts.
A(n) __________ artifacts can be created when attempting to correct for a cupping artifact by applying a correction algorithm too aggressively to the data for a head image. This results in the _________ of the image appearing too bright.
A. Capping, edges.
B. Capping, center.
C. Edge gradient, edges.
D. Edge gradient, center.
B - Capping, center.
CT X-ray tube arcing can occur because of __________ the X-ray tube.
A. Impurities in the oil outside.
B. Tungsten gas inside.
C. Tungsten solids in the oil inside.
D. A & B only.
E. B & C only.
D - A & B only.
Out-of-field artifacts
Occur when anatomy (such as the pts arms) extend beyond the scan field of view.
Increasing SFOV will reduce this artifact by decreasing the likelihood of anatomy extending beyond its boundaries.
Which of the following will have the LEAST likelihood of producing edge gradient artifacts?
A. Thin slices with full scan.
B. Thick slices with partial scan.
C. Thin slices with partial scan.
D. Thick slice with full scan.
A. Thin slices with full scan.
__________ in the inmate is a possible manifestation of patient motion.
A. Ghosting.
B. Blurring.
C. Streaking.
D. All of the above.
D. All of the above.
On a CT image of the brain a cupping artifact would appear brighter:
A. At the anterior & posterior aspect of the brain.
B. At the periphery of the brain.
C. Immediately around dense structures.
D. In the center of the brain.
C. Immediately around dense structures.
A cone beam artifact may look like stars:
A. At the center of the image.
B. Coming from structures around the edge of the image.
C. Coming from cone-shaped structures.
D. From all structures with high CT numbers.
B. Coming from structures around the edge of the image.
A variation in which of the following will affect the hardening of an x-ray beam? (Pick 1 or more)
1. Tissue density.
2. Tissue thickness.
3. kVp.
1, 2, and 3.
A CT artifact is:
A. a parameter used to control the brightness of the image.
B. always a reason to call for repair of the CT scanner.
C. Used to time the injection of contrast media.
D. An anomaly in the CT image.
D. An anomaly in the CT image.
Beam hardening refers to:
The increase in the average energy of the photons that reach the detectors.
Which of the following could allow for a reduction of partial volume artifact while NOT increasing the appearance of the noise in the image?
A. increasing slice thickness while decreasing kVp.
B. decreasing slice thickness while decreasing mAs.
C. Increasing slice thickness while increasing mAs.
D. Decreasing slice thickness while increasing mAs.
D. Decreasing slice thickness while increasing mAs.
