Siemens ARTIS 2 S Service Manual Page 446

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Quantification
Calibration
30 / 104 AXA4-100.620.08.01.02 Operator Manual
Catheter calibration
Starting At the system console
u Click on this icon.
The previous calibration factor - if there is one - is displayed.
In order to mark the known diameter, you must trace the outer contours of the
catheter.
Some catheter brands cannot be used for calibration as their outer dimensions
are not accurate enough.
To improve the calibration accuracy, we recommend measuring the actual cath-
eter thickness before calibrating.
The smaller the calibration object, the greater the calibration error.
You must also take a possible error into account due to the difference in the de-
gree of magnification of the catheter and the vessel to be analyzed, if the cath-
eter and the vessel are located at different tissue depths, that is, at different
distances from the image intensifier or flat detector. The error is estimated to
be 1 to 1.5 % for each cm of difference in depth.
Catheter calibration is not recommended for LVA because the calibration object
is much smaller than the measured object, and even slight deviations in calibra-
tion can result in significant errors in volume calculation.
For QVA, catheter calibration should be used with I.I./FD zoom stages only (not
in overview format).
The catheter calibration software is validated for a catheter size of 7 French.
Using catheter calibration with catheter sizes of 4 French or smaller is not al-
lowed because accuracy would not be sufficient.
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