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xff_-_vtc_format [2011/04/04 17:57]
jochen created
xff_-_vtc_format [2011/04/04 19:43] (current)
jochen finished list of fields
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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 ​ |
  
xff_-_vtc_format.txt ยท Last modified: 2011/04/04 19:43 by jochen