Voyager disk map
VOYAGER DISK MAP CODE
In the screenshot below, the intent code "3" specifies that the stored data contains t test values and the intent parameter 1 (see "intent_p1" entry) contains the degrees-of-freedom of the t test.
Depending on the stored statistical data, additional parameters (up to 3) may be stored in additional intent parameter fields such as the degrees of freedom of the respective statistical tests. whether the map contains t test, F test, correlation or z score values (among others). The header also contains an intent code that, if filled, specifies the stored (statistical) data, e.g. In a similar way either the standard volume map type or the NIfTI file type can be selected when adding maps or when saving volume map data to disk.Ī NIfTI file is identified as a (statistical) map if its header specifies a 3D or 4D data volume containing float or double values (see screenshot below). Using the selection box in the right lower area (see red arrow), either the Volume map files (VMPs) or the NIfTI volume map files file type can be chosen for selecting a file on disk. The (Windows 10) screenshot below shows the Volume Maps dialog on the left and the Open VMP File dialog on the right that appears after clicking the Load button (see red rectangle) in the Volume Maps dialog. When opening or saving volume map data, the appearing Open File or Save File dialog offers two file type options, one for standard BrainVoyager volume map (VMP) files and one for NIfTI volume map files. BrainVoyager v22.2 NIfTI Volume Map FilesīrainVoyager supports (since version 21.2) direct loading and saving of NIfTI volume maps using the Load, Add and Save buttons in the Volume Maps dialog.