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>> In this regard, suppose we have 2 voxels whose MNI coordinates are (1 2 >> 3) and (2 2 3). Is the distance between the two 1mm? > The answer is no Actually Marko, I think the answer is yes (as they are MNI coordinates, which are in mm).. v1 = [1 2 3]; v2 = [2 2 3]; distance = norm(v2-v1) Best regards, -John On 27 June 2012 07:34, Marko Wilke <[log in to unmask]> wrote: > Ce, > > >> Thank you very much for your response, Dr Mclaren. > > > I'll answer for Donald so he gets a break ;) > > >> In this regard, suppose we have 2 voxels whose MNI coordinates are (1 2 >> 3) and (2 2 3). Is the distance between the two 1mm? > > > The answer is no: you are looking at a distance in 3D, for which you will > have to calculate the Euclidian distance. In order to obtain this, you may > want to you play with an extension of Pythagoras' theorem to get the length > of the vector between two points in space. In other words, "the length of > the vector results from the square root of the sum of squared translations > in each dimension". See PMID 22036679. > > Cheers, > Marko > -- > ____________________________________________________ > PD Dr. med. Marko Wilke > Facharzt für Kinder- und Jugendmedizin > Leiter, Experimentelle Pädiatrische Neurobildgebung > Universitäts-Kinderklinik > Abt. III (Neuropädiatrie) > > > Marko Wilke, MD, PhD > Pediatrician > Head, Experimental Pediatric Neuroimaging > University Children's Hospital > Dept. III (Pediatric Neurology) > > > Hoppe-Seyler-Str. 1 > D - 72076 Tübingen, Germany > Tel. +49 7071 29-83416 > Fax +49 7071 29-5473 > [log in to unmask] > > http://www.medizin.uni-tuebingen.de/kinder/epn/ > ____________________________________________________