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curv_thresh = cos( angle in radian ) --> angle in deg = acos(thresh)*180/pi saad. On 5 Jan 2011, at 19:54, Woodman, Sandra wrote: > Hello FSL! > > Our lab is wondering if anyone could tell us what the calculation is to get from > a curvature threshold to an angle. We wish to run Probtrackx looking at the > effect of various angles, and need to know how to translate the angle into > curvature threshold, ie what is the curvature threshold for an angle of 20 > degrees? What is the exact calculation? > > Any help is appreciated. > > Thank you! > > Sandra > > Sandra Woodman > Mood and Motor Control Laboratory > Athinoula Martinos Center for Biomedical Imaging > Massachusetts General Hospital > 120 6th St. > Charlestown, MA 02129 > Tel: 617-643-6245 > Fax: 617-726-1351 > Email: [log in to unmask] > > > > > The information in this e-mail is intended only for the person to whom it is > addressed. If you believe this e-mail was sent to you in error and the e-mail > contains patient information, please contact the Partners Compliance HelpLine at > http://www.partners.org/complianceline . If the e-mail was sent to you in error > but does not contain patient information, please contact the sender and properly > dispose of the e-mail. > -- Saad Jbabdi University of Oxford, FMRIB Centre JR Hospital, Headington, OX3 9DU, UK (+44)1865-222466 (fax 717) www.fmrib.ox.ac.uk/~saad