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Glossary
M-14 SOMATOM Spirit
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Pitch factor
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Term applicable only for spiral CT. It is defined as the ratio of
table feed per rotation to the collimated width of the entire
detector. Example: 16 * 0.75 mm collimation, table feed 18
mm/sec, rotation time 1 s. This gives a pitch factor of 18 / (16 *
0.75) = 18 / 12 = 1.5.
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Pixel
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Image element of the two-dimensional image.
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R
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RAM
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Fast, non-permanent memory (Random Access Memory) with
which the computer operates. The size of the available RAM
determines other factors, including the processing speed. Data
are stored long term on hard disk, MOD or CD-R.
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Raw data
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Preprocessed measurement data. A raw data file corresponding
to each scan is used to reconstruct the CT image.
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Real Time Display
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Displaying of the measured image synchronous to the scanning
and just after the acquisition of a slice (rotation) is finished.
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Real Time Recon
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Reconstruction synchronous to scanning with an additional
delay for displaying the first image.
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