Hi Anastasia!
That makes sense, thank you! So the question is how do I evaluate the noisiness of a path? 1) Most of my isosurfaces look a lot noisier than your example on the wiki. There's obviously no hard and fast rule here but is there any way to gauge the noisiness of a reconstructed path? And can that information be used for quality control? 2) Another source of information on outliers is the log files that are produced when running -trac-all -stat (based on the shape of the tract). It doesn't seem to flag tracts that are (almost) completely missing (which are spotted by visual inspection in Freeview) - but they may fall under the minimum threshold and therefore not be evaluated? Would you recommend automatically excluding the subjects that are flagged as outliers here? >Hi Lars - A path with fewer control points will generally be smoother. So >if the tract is pretty much a straight line, you might get a noisier >result if you increase the number of control points. But if the tract is >more convoluted than a straight line, then you need more control points to >define it accurately. So it's hard to predict the result of increasing the >control points in general, it depends on the specific case. >BTW, if you change the number of control points, you don't need to use the >reinit variable - that's only for rerunning with the same control points >as before. > >Best, >a.y sincerely yours, Lars M. Rimol, PhD Senior researcher, Norwegian Advisory Unit for functional MRI Department of Radiology, St. Olav's University hospital, 7006 Trondheim, Norway
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