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Re-Hello, The dataset 'WhereIsRight' under the link below was corrupted, it's now OK, http://www.madic.org/fiac/how_to_participate.html#data_format very best jb > Hello, > > > There was a right/left question on the list for the FMRI analysis > contest (FIAC) data. > > Thanks to the marseille center, we have now put on the web an anatomical > image with a visible landmark on the right : > http://www.madic.org/fiac/how_to_participate.html#data_format > This may be useful generally to check the display convention > > best > > jb > John Ashburner a écrit : >>This e-mail won't be quite as easy as the last. Sorry. Because I've also >>been having trouble with the orientation of our fMRI images, I've been >>following these e-mails (specifically about image orientation). Can you >>please tell me what LPI and RPI are? >> >> > >LPI is left, posterior, anterior, and RPI is right, posterior, inferior. The >first element (L or R in this case) indicates the fastest changing direction >within the file. The last element (I in this case) indicates the slowest - >i.e. the way that the planes of data are stored. > >Best regards, >-John > > > >>Quoting John Ashburner <[log in to unmask]>: >> >> >>>>after John's emails I'd like to be sure about a couple of things. >>>>1- What matters for flipping is the handness of storage, is that >>>>correct? >>>> >>>> >>>Yes. >>> >>> >>> >>>>2- Data stored in Right hand system needs not to be flipped, while Left >>>>hand stored data need to be flipped.? >>>> >>>> >>>Yes. >>> >>> >>> >>>>3- To tell the handnees of the actual >>>>data, John suggested to look at voxel (1,1,1) for axial images. Now if >>>>voxel (1,1,1) is LPI my data are right hand and need not to be flipped >>>>in x dimension. is that correct? >>>> >>>> >>>Yes. >>> >>> >>> >>>>If voxel (1,1,1) is RPI data need to be flipped >>>>in x dimension. is that correct? >>>> >>>> >>>Yes. >>> >>> >>> >>>>thanks for any help >>>> >>>> >>>That was easy. >>> >>>best regards, >>>-John >>> >>> > > > > -- +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ | Jean-Baptiste Poline [log in to unmask] | | 4 Pl General Leclerc www.madic.org | | CEA/DRM/SHFJ Tel +33 (0) 1 69 86 78 37 | | 91406 ORSAY FRANCE Fax +33 (0) 1 69 86 77 86 | +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+