Operating instructions

186
syngo Calcium Scoring
The Agatston score represents the amount of
detected calcium in each individual coronary artery.
For every slice, the area of each lesion is weighed by a
factor f which depends on the peak CT value of this
lesion:
f = 1 for 130 HU/Peak CT value < 200 HU
f = 2 for 200 HU/Peak CT value < 300 HU
f = 3 for 300 HU/Peak CT value < 400 HU
f = 4 for 400 HU and above
All scores of a specific artery are added for the Agat-
ston score of this artery. All scores of all arteries are
added for the total Agatston score.
The original definition of the Agatston score is based
on contiguous 3 mm slices. For a study which was
acquired with a slice thickness different from 3 mm
(e.g., 2.5 mm), or for overlapping slices, an equivalent
Agatston score is calculated. It takes the different slice
width and interslice distance into account.
Hint: The score table will be updated immediately after
you have set a seed point or drawn a freehand ROI, or
after any modification or deletion of a calcification
marking. The floating score table window appears,
whenever you temporarily blow up the display of seg-
ment 1. Segment 4 shows the score table for each
evaluated arterial label (color-coded).