Inobitec DICOM Viewer

2.18. Calcium Scoring

____________________________________________________________________________________________

Functionality is available in the Pro edition
____________________________________________________________________________________________

The Viewer allows you to measure calcium in the coronary arteries. CT-series with information about the slice thickness are suitable for measurement. For all other series tools are not available.

The tool selection button will look different depending on the tool that was used last:

PIC Calcium scoring (ellipse) (selected by default)
PIC 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.

2.18.1 Selection of measurement areas

____________________________________________________________________________________________

Functionality is available in the Pro edition
____________________________________________________________________________________________

To measure calcium:

  1. Open a CT series suitable for a calcium scoring.
  2. Select image to measure.
  3. Activate the PIC Calcium scoring (ellipse) tool or PIC Calcium scoring (polygon). These tools are similar to ROI ellipse and ROI polygon (see Section 2.14.5). If the study does not contain information about the age and/or gender of the patient the dialog shown in Fig. 2.38 appears. Enter missing information and click OK to continue or Cancel to cancel the measurement. After clicking OK this dialog no longer appears until the Flat image viewer window is closed. To change the gender and/or age of the patient close the Flat Images View window and return to 1 step.
  4. When the calcium scoring tool is active a window shown in Fig. 2.39 is displayed on the screen. Move the window if necessary. To do this move the cursor over the window title (highlighted in red in the figure) and move it holding the left mouse button. In the upper part of the window there are vessel selection buttons:
    • LM — Left main coronary artery
    • LAD — Left anterior descending coronary artery
    • LCX — Left circumflex coronary artery
    • RCA — Right coronary artery

    Select an artery for measurement by clicking the corresponding button. The choice of artery does not affect the measurement result.

  5. Build an ellipse or polygon around the affected area. For detailes on how to build see Section 2.14.5 (the ROI ellipse and ROI polygon tools). A block with the following data is displayed near the measurement:
    • The name of the artery (corresponds to the button pressed while building);
    • Area of calcified lesion. If the measurement area contains several lesions then their total area is displayed;
    • Agatston score;
    • Volume score.





To deactivate the tool click the tool selection button PIC Calcium scoring (ellipse) tool or PIC Calcium scoring (polygon) or close the Calcium scoring window. All changes made are saved until the Flat images view window is closed.

2.18.2 Actions with measurement areas

____________________________________________________________________________________________

Functionality is available in the Pro edition
____________________________________________________________________________________________

For detailes on how to move measurement areas see Section 2.14.8, how to move measurement results see Section 2.14.9.

To edit the drawing parameters:

  1. Activale the calcium scoring tool.
  2. Locate the cursor on the measurement or the mesurement results to highlight them.
  3. Right-click the mouse and select the Set render params... item from the context menu.
  4. In the dialog box that appears enter the measurement name.
  5. Set the color by clicking on the color box.
  6. Set the line thickness and font size.
  7. To connect the block with measurement results and the measurement of the dotted line the Footnote line box must be checked.
  8. To display the block with measurement results the Show labels box must be checked.
  9. To use this parameters by default check the box Set as default.
  10. To apply the settings click OK. To cancel the settings click Cancel.

2.18.3 Measurement results

____________________________________________________________________________________________

Functionality is available in the Pro edition
____________________________________________________________________________________________

The measurement results are displayed in the window shown in Fig. 2.39:

  1. For each vessel separately and total:
    • total lesion area (for all lesions);
    • lesions numder (N);
    • Agatston score (AS);
    • Volume score (VS).
  2. Patient gender
  3. Age group
  4. Percentile

The measurement results are exported in html format and can be inserted into text editors that support 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.