Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
CT Artifacts
Study Questions
| Question | Answer |
|---|---|
| If more than one tissue is contained in a voxel, the CT number is determined by a _____________ of the densities of the contents of the voxel. | weighted average |
| What artifact can occur when more than one tissue type is contained in a voxel? | partial volume averaging |
| What artifact results from the mathematical averaging of various attenuation coefficients from several millimeters of different types of tissue? | partial volume averaging |
| How can we minimize the partial voluming effect? | using thinner slices |
| The edge gradient effect is one of the many causes of ____ artifacts in CT images. | streak |
| Out-of-field artifacts may look like ____ or ____ on CT images. | streaks or shading |
| The severity of the out-of-field artifact depends on what? | amount and density of the anatomy outside the SFOV |
| Which artifact results from a faulty or miscalibrated detector element? | ring artifact |
| If a detector has an offset difference of as little as ___% with neighboring detectors, a ring artifact may result on the images. | 0.1% |
| When might tube arcing occur within the tube? | when the tube vacuum is compromised |
| When might tube arcing occur outside of the tube? | when impurities cause the oil to become electrically conductive |
| Each time the tube arcs, the ____ data for that view is distorted. | projection |
| The spreading of the x-ray photons along the z-direction is responsible for an artifact called what? | cone beam artifact |
Created by:
sspatel
Popular Radiology sets