4.
Click [Erase selected graphics] to erase all annotations.
4.2 Use MIROI density reading to calculate bolus timing
Use this procedure to calculate the scan delay for a contrast enhanced exam.
Scale for HU, there are two selections.
•
Absolute: has an actual Hounsfield Unit number for each ROI plotted on the graph.
•
Relative: the ROI measured for the first image is set to zero and the change from zero is
plotted for the rest of the images.
1. From the viewport control panel, click the arrow next to
Measure/Annotate
to display
measurement icons.
2.
Click the [MIROI] button to open the MIROI controls window.
3.
Define the region of interest using either the eillipse ROI button or the rect ROI button.
4. Click and drag the ROI to the anatomy of interest. Size the ROI to fit completely inside the
aorta.
5.
Click [Plot].
6. Use the graph to calculate the scan delay.
7. Optionally, screen save the graph. Right click and select
Screen Save
Revolution CT User Manual
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