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9 Cards in this Set
- Front
- Back
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When was continuous imaging (CI) introduced? and what is another name for it?
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1993
near real time CT / CT flouro |
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How does continuous imaging (CI) work?
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New data is added to the image file every 60-degrees and then discarded as the next image appears.
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What are some of the uses of continuous imaging (CI)?
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-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 |
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What are the advantages of subsecond scanning?
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-decrease motion artifacts
-greater scan coverage -better imaging of the heart -cardiac gating |
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What are the advantages of multislice detectors?
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Multislice detectors allow acquisition of up to 4 slices simultaneously.
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What is slice width? and what determines slice width?
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-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. |
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What is complimentary data?
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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
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What are some pitch increments that should be avoided?
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-Intergers such as 4.0 , 6.0- decreased image quality
-less that 1- due to overlapping and increase pt dose. |
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What are some potential problems with the fast multislice sprial/helical CT scanners?
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-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 |
