16. Measure with the CT chamber in all
positions.
17. The weighted CTDI is shown. It is
calculated according to the definition in
the topic Definition of CTDI .
If you move the CT chamber when the message box is not shown a false
trig will most likely occur. This is normal and just tap Reset after
repositioning the CT chamber.
In the topic Typical Parameters for CT Scanner Models you can find references to
finding out standard TF and CTDI values for many different CT models.
Return to the real-time display by tapping Back. It is also possible to look at the
waveform to study how the dose rate varies during the scan.
1. Place the chamber in a peripheral hole.
2. With the CT dose real-time display active tap Reset.
3. Make one scan.
4. You will get a CT dose value in the display. Tap Wave to get the waveform.
5. You will now see the dose rate intensity in the phantom position you selected. The
shape of the waveform will depend on which position you selected and starting
position for the gantry. It may look like in the figure below.
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