Editing Scanco Administration (section)

====Dose calculation====

Assuming the following settings on the vivaCT for "high mode", we will calculate the CTDI dose.

 2000 projections (360 degrees)
 0.109 mA
 200 ms IT

I calculate the time current value as:

 0.109 mA * (0.200 + 0.012) S * 2000 proj= 46.22 mAs

The 0.012 is the integration time between projections.

Taking the proportion of the 68 mAs at 55 kV resulting in 720 mGy (see the document on example
dose calculation on this Wiki site), we have:

 46.22 / 68 * 720 = 490 mGy

Since CTDI in air is approximately two times the weighted CTDI, and since our setup is more like in air, we get:

 2 * 490 = 980 mGy per scan.

It's always a good idea to look at the time-current product in the control file to get an approximate estimate.


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