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A CT scan is essentially a series of many x-rays. These x-rays are essentially slices of your body. These slices are perpendicular to your spine.
So... say you have a hot dog. And embedded in this hot dog is a BB - a small metal sphere. Now, say you can cut the hotdog into many slices looking for this BB. You can only cut the hotdog perpendicularly to the length, you can only look at the areas of the hotdog exposed by the slicing, and all slices must be the same thickness. The shape of these slices is a disk, BTW. If the thickness of the hotdog slices are wider than the BB - you might actually slice through the whole hotdog and not see a BB on any surface exposed by a the slicing.
Now... it stands to reason that if you have thinner slices, you have a greater chance at cutting into the BB or exposing the BB with one of the cuts.
The CT scan is a lot like this... but the 'slices' are essentially x-ray pictures of your body. If the slices are closer together, you have a greater chance of finding something. The pancreatic protocol has thinner slicing AND has the contrast application timed a bit differently (I think) to maximize the possibility for the tumor lighting/being seen.
Hope this helps.
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