CT Scan image reconstruction (80 KeV vs 80 kVp)

  • #1

Main Question or Discussion Point

Hello everyone,

I was wondering what would be the differences in case that we had to reconstruct a set of 80 kvp images vs a set of 80 kev images.

I suppose that it would be faster in the first case since there would be less time needed since the attenuation coefficient would be fixed in the absence of an energy spectrum, but I would be curious to find out some extra thoughts.
 

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  • #2
Choppy
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Interesting question. What filter does the 80 kVp system have?

I think the main advantage of a monoenergetic source would be that if you could rig up a means of energy discretion in your detectors you would have a much easier time isolating your primary signal because everything with a lower energy can be attributed to be scatter. You would still have coherent scatter to contend with, I suppose, but you'd still likely be able to generate a much better signal to noise ratio. Inherently I would think that there would be more contrast from a monoenergetic source as well, but you did say 80 keV vs 80 kVp, so you're comparing a spectrum to it's maximum energy. The maximum energy in a spectrum will, in most cases have the least attenuation, and therefore generate the least contrast..

You could take it a step further. If you could use two monoenergetic sources, you could place them above and below the K-edge of a given element to generate high contrast in regions where that element exists.

I'm not sure how much faster the reconstruction process would be. I'm thinking you'd still have to go through the whole filtered back-projection process. You ight save time on any additional processing to remove the scatter though.
 

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