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9 Cards in this Set

  • Front
  • Back
When was continuous imaging (CI) introduced? and what is another name for it?
near real time CT / CT flouro
How does continuous imaging (CI) work?
New data is added to the image file every 60-degrees and then discarded as the next image appears.
What are some of the uses of continuous imaging (CI)?
-CT guidance in interventional prcedures
-The ability to stop a scan when all volume of interest is covered
-Rapid indication of trauma cases
-Vessel tracking / premonitoring phases
What are the advantages of subsecond scanning?
-decrease motion artifacts
-greater scan coverage
-better imaging of the heart
-cardiac gating
What are the advantages of multislice detectors?
Multislice detectors allow acquisition of up to 4 slices simultaneously.
What is slice width? and what determines slice width?
-Slice width is defined at the center of rotation / gantry aperature, so actual dementions ae will be greater due to magnification
-The smallest slice width is determined by the smallest single detector element.
What is complimentary data?
It is when an images is flipped 180-degrees and used for interpolated reconstruction. It compliments the other 180-degress to equal the full360-degrees
What are some pitch increments that should be avoided?
-Intergers such as 4.0 , 6.0- decreased image quality
-less that 1- due to overlapping and increase pt dose.
What are some potential problems with the fast multislice sprial/helical CT scanners?
-high #s of images (300-2000)storing, interpretation, archiving
-increase of images Rads need to read, MPRs, 3Ds, 4Ds
-need for faster computer/pacs systems