Hi, I don't expect a drastic change, only a slight loss of spatial resolution if the ray distance at the isocenter (I agree with Chao that it plays an important role) is larger than the original voxel size. Maybe it's there but you would need to zoom more to see it. You would see a more realistic difference if you were adding photon noise to your data. Simon
On Tue, Jun 28, 2016 at 9:14 AM, Chao Wu <[email protected]> wrote: > What is the magnification factor of your geometry? > > 2016-06-27 23:56 GMT+02:00 Solomon Tang <[email protected]>: > >> Hi Simon, >> >> I am using RTK to simulate CT acquisitions using different detector sizes >> to see how this impact on image quality might change some of our in-house >> metrics. >> >> The images I have linked to below have been created using >> rtkforwardprojections with different projection spacings (0.3 isometric and >> 0.75 isometric) reconstructed with rtkfdk with the same pixel spacing and >> image dimensions (0.4688x0.4688x0.6 | 512x512x225). The CUDA projection >> stepsize is equal to the projection spacing. The window levels between >> images of their respective rows are the same. >> >> I am simply wondering if the differences between these images are >> realistic. I would expect the image with a detector size than is more than >> twice as large as the original would be drastically different when in fact >> they turn out to be incredibly similar. Are the assumptions made about >> projection spacing == cuda stepsize == simulated hardware detector size >> incorrect? >> >> <http://goog_1486088111> >> https://gyazo.com/e86436826f687a2db4b234699d050450 >> >> https://gyazo.com/ca9612218f082e78ba3082950a27fa4c >> >> Solomon >> >> _______________________________________________ >> Rtk-users mailing list >> [email protected] >> http://public.kitware.com/mailman/listinfo/rtk-users >> >> > > _______________________________________________ > Rtk-users mailing list > [email protected] > http://public.kitware.com/mailman/listinfo/rtk-users > >
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