No Streaks
No Peaks!
No Peaks!
What is the artifact that appears when part of the body is outside of the FOV?
Truncation Artifact
How many counts are recommended for a high-count SPECT flood?
100-200 million counts
What is COR in SPECT imaging?
The axis about which the camera rotates
What structures are in the Jaszczak phantom?
Rods and Spheres
A ring artifact occurs during what?
Back Projection
How often are high-count floods performed?
Weekly or per manufacturer reccomendations
The most common shift in COR is due to what?
Electronic malfunction
How often are the Jaszczak phantoms performed?
Quarterly or Annually
Why must the camera account for the varying responses from the different PMT's?
To ensure there is a uniform response from the difference from the PMT's
What is the typical counts per second for a typical high-count flood?
20,000-30,000 counts per second
What is the amount of 99mTc needed for a tracer to perform COR's?
300 μCi
What phantom simulates lung tissue?
Lung phantoms
Arc Artifact
How many counts for high-count floods are recommended for statics (64x64 matrix)?
30-40 million counts
What graph assesses CORs, and what offset does it go off of?
Sinogram and x offset
What do you have to compare your Jaszczak phantom images with?
Previous Jaszczak phantom images to look for degradation
Defects are generated through what?
Reconstruction process
Different what may require separate correction matrices?
Different collimators or radionuclides
What is the maximum x-offset deviation before service is required?
3 pixels
What is the smallest sphere you can see in a Jaszczak phantom analyze?
Resolution