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| xff_-_vtc_format [2011/04/04 15:57] – created jochen | xff_-_vtc_format [2011/04/04 17:43] (current) – finished list of fields jochen |
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| | | Resolution | uint16 | ''1x1'' | indicates the spatial resolution in mm of the data (VTC files must store data in iso-metric resolution with an integer size argument; commonly supported values are ''1'', ''2'', and ''3'' representing 1mm-, 2mm-, and 3mm-resolution data; higher resolutions might not be fully supported by BrainVoyager) | | | | Resolution | uint16 | ''1x1'' | indicates the spatial resolution in mm of the data (VTC files must store data in iso-metric resolution with an integer size argument; commonly supported values are ''1'', ''2'', and ''3'' representing 1mm-, 2mm-, and 3mm-resolution data; higher resolutions might not be fully supported by BrainVoyager) | |
| | | XStart | uint16 | ''1x1'' | gives the X-coordinate (in BrainVoyager's internal coordinate system, this goes from front to back of the brain) where the data "starts" in space (a value between ''0'' and ''255'') | | | | XStart | uint16 | ''1x1'' | gives the X-coordinate (in BrainVoyager's internal coordinate system, this goes from front to back of the brain) where the data "starts" in space (a value between ''0'' and ''255'') | |
| | | | XEnd | uint16 | ''1x1'' | gives the X-coordinate (in BrainVoyager's internal coordinate system, this goes from front to back of the brain) where the data "ends" in space (a value between ''0'' and ''255'' that must be greater than XStart), **together with XStart and Resolution gives the number of voxels in X direction by the formula ''DimX = (XEnd - XStart) / Resolution''** | |
| | | | YStart | uint16 | ''1x1'' | gives the Y-coordinate (in BrainVoyager's internal coordinate system, this goes from the top to the bottom of the brain) where the data "starts" in space (a value between ''0'' and ''255'') | |
| | | | YEnd | uint16 | ''1x1'' | gives the Y-coordinate (in BrainVoyager's internal coordinate system, this goes from the top to the bottom of the brain) where the data "ends" in space (a value between ''0'' and ''255'' that must be greater than YStart), **together with YStart and Resolution gives the number of voxels in Y direction by the formula ''DimY = (YEnd - YStart) / Resolution''** | |
| | | | ZStart | uint16 | ''1x1'' | gives the Z-coordinate (in BrainVoyager's internal coordinate system, this goes from the right to the left side of the brain) where the data "starts" in space (a value between ''0'' and ''255'') | |
| | | | ZEnd | uint16 | ''1x1'' | gives the Z-coordinate (in BrainVoyager's internal coordinate system, this goes from the right to the left side of the brain) where the data "ends" in space (a value between ''0'' and ''255'' that must be greater than ZStart), **together with ZStart and Resolution gives the number of voxels in Z direction by the formula ''DimZ = (ZEnd - ZStart) / Resolution''** | |
| | | FileVersion > 2 | Convention | uint8 | ''1x1'' | indicates the spatial convention in which the data is stored/to be displayed (radiological or neurological; **this flag is not heeded by NeuroElf, which expects data to be stored according to the original standard of BrainVoyager**) | |
| | | FileVersion > 2 | ReferenceSpace | uint8 | ''1x1'' | indicates the type of reference space of the data (raw/native data space, AC/PC space, TAL space; **NeuroELf does not heed this flag either, and data is simply shown at the locations indicated by the X/Y/ZStart/End fields**) | |
| | | FileVersion < 3 | HemodynamicDelay | int16 | ''1x1'' | gives the number of milliseconds for the hemodynamic response function's delay parameter (no longer used, dropped in FileVersion 3) | |
| | | | TR | single | ''1x1'' | gives the temporal resolution (time-of-repetition, TR) in milliseconds | |
| | | FileVersion < 3 | HrfDelta | single | ''1x1'' | gives the HRF delta parameter (no longer used, dropped in FileVersion 3) | |
| | | FileVersion < 3 | HrfTau | single | ''1x1'' | gives the HRF tau parameter (no longer used, dropped in FileVersion 3) | |
| | | FileVersion < 3 | SegmentSize | uint16 | ''1x1'' | gives the size of one "segment" (block length) in volumes for protocol overlay (no longer used, dropped in FileVersion 3) | |
| | | FileVersion < 3 | SegmentOffset | int16 | ''1x1'' | gives the offset of the first "segment" (block) in volumes for protocol overlay (no longer used, dropped in FileVersion 3) | |
| | | DataType == 1 | VTCData | uint16 | ''NrOfVolumes-x-DimX-x-DimY-x-DimZ'' | uint16-based data with time being the innermost (fastest increasing) index/loop | |
| | | DataType == 2 | VTCData | single | ''NrOfVolumes-x-DimX-x-DimY-x-DimZ'' | float-based data with time being the innermost (fastest increasing) index/loop | |
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