On Fri, Mar 5, 2010 at 1:36 AM, Søren Hauberg <so...@hauberg.org> wrote: > 2. It would be nice if the help text more clear explains what a > 'phantom' is. Personally, I don't know what it is.
FYI, A "phantom" is basically a non-human object used to assess image reconstruction quality in medical imaging. The Shepp-Logan is a digital 3D phantom that is designed to have grossly brain-like features but also at the same time have a precisely defined mathematical structure so that reconstruction algorithms can be tested by simulation and comparision to the known ground truth. (The concept of truth is problematic in medical imaging because there are multiple (if not infinite) plausible images that correspond to the acquired data) I think Shepp-Logan is in designed to even be analytically useful. Physical phantoms also exist that are placed in the imagers. For example, there is the a series of phantoms produced by the American College of Radiologists (and the European equivalent--I'm blocking on the name at the moment) that are used to calibrate imagers. If you google for "ACR phantom" you'll find lots of pictures. --judd ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
