____________________________________________________________________________________________
Functionality is available in the Pro edition
____________________________________________________________________________________________
The DICOM Viewer allows you to measure calcium in the coronary arteries. CT-series with information about the slice thickness are suitable for the measurement. For all other series, the tools are not applicable.
The tool selection button will look different depending on the tool that was used last:
![]() |
Calcium scoring (ellipse) (selected by default) |
![]() |
Calcium scoring (polygon) |
To switch between these tools click the arrow on the right side of the tool selection button and select the desired tool.
____________________________________________________________________________________________
Functionality is available in the Pro edition
____________________________________________________________________________________________
To measure calcium:
Select the artery for measurement by clicking the corresponding button. The choice of an artery does not affect the measurement result.
To deactivate the tool click the tool selection button Calcium scoring (ellipse) tool or
Calcium scoring (polygon) or close the Calcium scoring window. All the changes made
are saved until the Flat images view window is closed.
____________________________________________________________________________________________
Functionality is available in the Pro edition
____________________________________________________________________________________________
For details on how to move measurement areas, see Section 2.15.8, for how to move measurement results, see Section 2.15.9.
To edit the drawing parameters:
____________________________________________________________________________________________
Functionality is available in the Pro edition
____________________________________________________________________________________________
The measurement results are displayed in the window shown in Fig. 2.29:
Formula for Agatston index scoring:
![]() |
(2.9) |
Ics — Agatston index, n — lesion number, Si — i-lesion area, Fi — i-lesion density factor, Tslice — slice thickness. The Fi value is determined by the maximum pixel density in the lesion area:
Maximum pixel density | Fi |
130—199 HU | 1 |
200—299 HU | 2 |
300—399 HU | 3 |
≥ 400 HU | 4 |
Formula for calcium scoring:
![]() |
(2.10) |
V cs — Agatston index, n — lesion number, Si — i-lesion area, Tslice — slice thickness.
Electron beam tomographic coronary artery calcium score percentiles for men and Women within each age strata
<40 | 40-44 | 45-49 | 50-54 | 55-59 | 60-64 | 65-69 | 70-74 | >74 | |
Man (25251) | 3504 | 4238 | 4940 | 4825 | 3472 | 2288 | 1209 | 540 | 235 |
25th percentile | 0 | 0 | 0 | 1 | 4 | 13 | 32 | 64 | 166 |
50th percentile | 1 | 1 | 3 | 15 | 48 | 113 | 180 | 310 | 473 |
75th percentile | 3 | 9 | 36 | 103 | 215 | 410 | 566 | 892 | 1071 |
90th percentile | 14 | 59 | 154 | 332 | 554 | 994 | 1299 | 1774 | 1982 |
Woman (9995) | 641 | 1024 | 1634 | 2184 | 1835 | 1334 | 731 | 438 | 174 |
25th percentile | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 9 |
50th percentile | 0 | 0 | 0 | 0 | 1 | 3 | 24 | 52 | 75 |
75th percentile | 1 | 1 | 2 | 4 | 23 | 57 | 145 | 210 | 241 |
90th percentile | 3 | 4 | 2 | 55 | 121 | 193 | 410 | 631 | 709 |
The measurement results are exported in the html format and can be inserted into text editors that support the html markup, for example, LibreOffice Writer or Microsoft Word. To do this click the Export to clipboard button, create a document in a text editor and paste the copied information into it.