Digital
We finally got to play around with our new digital processor in lab today. We did some comparisons between film and digital, and there are some new questions in my mind now that simply don’t make sense at all. We did a lab to show the relationship between kVp and density, but we did the same exposures on film and on digital (CR). Our film images behaved as expected… the density increased each time we increased the kVp and left the mAs at the same settings. The digital images, on the other hand, all displayed with relatively similar densities, but we could see the differences in penetration on our step wedge. The digital system compensates for improper exposures (LGM). The big question that I had, that our instructor couldn’t answer (yet) is why can’t we see the unaltered image in the digital system? There is probably a way to look at the image as captured before the system manipulates it. If we could see these images, they should look similar to our film exposures with one minor exception. The detail screen we used for the film exposures was a 50 speed screen and the digital image receptors are 100 speed. More research to come…
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