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+Alternative
*Posteroanterior projection, or slightly oblique to avoid superimposing the spine.<ref name=Helsingborg/>
*First image the contrast filling of the port chamber and the catheter to exclude malfunction.<ref name=Helsingborg/>
*Imaging of the outflow from the catheter is imaged at 10-15 <ref name="Frequency" group="note"/> images per second.<ref name=Helsingborg/>
After the procedure, the system should be flushed with 20 - 30 ml normal saline.<ref name=Helsingborg/>
*Position of the catheter tip in relation to the central veins
*Presence or absence of fibrin sheath
==Notes==
{{reflist|group="note"|
refs=
<ref name="Frequency" group="note">A frequency of 2-4 images per second has also been suggested (Knutstad, 2016), which confers a lower radiation dose but makes it more difficult to determine the dynamic flow of contrast.</ref>
}}
==References==
{{reflist}}
