ARRT ARRT CT Artifacts and Troubleshooting

Question 1

What type of artifact appears as bright or dark streaks radiating from high-density objects like metal implants in CT images?

Accepted Answer

Beam hardening artifact

Answer

Ring artifact

Answer

Motion artifact

Answer

Partial volume artifact

Question 2

A ring or band artifact centered on the image is most likely caused by a malfunction of which CT component?

Accepted Answer

A single detector element

Answer

X-ray tube

Answer

Collimator

Answer

Gantry motor

Question 3

Which artifact is caused by patient movement during CT data acquisition and appears as blurring or ghosting on the reconstructed image?

Accepted Answer

Motion artifact

Answer

Partial volume artifact

Answer

Aliasing artifact

Answer

Cupping artifact

Question 4

The 'cupping artifact' in CT, where the center of a uniform object appears less dense than its periphery, is a manifestation of which phenomenon?

Accepted Answer

Beam hardening

Answer

Aliasing

Answer

Quantum noise

Answer

Partial volume averaging

Question 5

Partial volume averaging artifacts in CT are best reduced by which acquisition parameter adjustment?

Accepted Answer

Using a thinner slice thickness

Answer

Increasing mAs

Answer

Increasing kVp

Answer

Widening the display window

Question 6

Aliasing artifacts in CT, which appear as fine streaks or Moiré patterns, are caused by which factor?

Accepted Answer

Insufficient detector sampling

Answer

High kVp settings

Answer

Excessive patient size

Answer

Incorrect table speed