Noticed discussion of fills and Flouro or barium swallow. I know a little so don't take this as being an expert. My doc flouros me after he fills just to check how contrast he has me swallow flows through the band area in stomach - has nothing to do with locating the port - that's all feel.
As far as flouro to barium swallow here's what I know.
Barium swallow study usually includes flouro. but they also take more x-rays and they are more detailed.
A quick flouro like my doc above is done without taking films or digital pictures and is just a quick check.
The contrast they use can be barium, ionic iodinated like hypaque, gastroview or gastrografin, or non-ionic where the only product approved is Omnipaque.
My doctor uses the ionic category. I've been trying to get him to use Omnipaque the non-ionic as it doesn't taste as bad and won't be as toxic to your GI track. Now keep in mind I sell Omnipaque so I must have some bias. But I have customers who will not give barium or the ionics if there is any risk of a perforation of the GI track as these older agents can cause problems. I've heard the ionics can give some irritation/diarrhea.
Omnipaque is more expensive but much less than it was 10 ears ago when it was way too expensive to use for these studies.
Bottom line is "barium swallow" is almost a generic term - they can use any of the 3 categories of contrast above. And flouro is part of it. X-rays or flouro won't show much without use of one of the contrast agents above.
Hope that helps.