The Format of FBR Files

FBR files are text files containing the fiber coordinates. The fiber data in the *.fbr format can be checked via any text editor. 

FBR format version 5: binary


 

FBR file parameter

Sample values

Description

 

Magic number (integer 32-bit):

0xB1C2D3A4
 
Value should be as specified in sample value for binary fiber files
FileVersion (integer 32-bit):

5

File version of the *.fbr file

CoordsType (integer 32-bit):

FibersOriginX (float 32-bit):
FibersOriginY (float 32-bit): 
FibersOriginZ (float 32-bit): 

 

BV I

128

128

128

 

BrainVoyager coordinate system: 2 - BVI (default), 1 - SYS, 0 - TAL (see https://helpdesk.brainvoyager.com/507721-BrainVoyager-Coordinate-Systems)

Origin of fibers (FileVersion 4)

 

NrOfGroups (int 32-bit):

1

 
Loop over groups:

 

 
Name (0-terminated 8-bit characters):

"Tracked From VOI: testvoi_ACPC"

 
Visible (integer 32-bit):

1

Boolean value indicating whether the fiber should be shown
Animate (integer 32-bit):

-1

 
Thickness (float 32-bit):

0.3

Thickness of the shown fiber in mm (?)
Color (3 * 8-bit):

25 25 127

RGB values for fiber (between 0 and 255)
NrOfFibers:

121

 
   
In group, loop over number of fibers:

 

 
NrOfPoints (integer 32-bit):

<points>

 

X positions (float) * number of points

Y positions (float) * number of points

Z positions (float) * number of points

101.209 128.266 120.192 

 

R colour (char) * number of points

G colour (char) * number of points

B colour (char) * number of points

  

 

FBR format version 4: text


 

FBR file parameter

Sample values

Description

 

 

 

 

 

 

FileVersion:

4

File version of the *.fbr file

CoordsType:

FibersOriginX:
FibersOriginY: 
FibersOriginZ: 

 

BV I

128

128

128

 

BrainVoyager coordinate system

Origin of fibers (FileVersion 4)

 

NrOfGroups:

1

 
 

 

 
Name:

"Tracked From VOI: testvoi_ACPC"

 
Visible:

1

Boolean value indicating whether the fiber should be shown
Animate:

-1

 
Thickness:

0.3

Thickness of the shown fiber in mm (?)
Color:

25 25 127

RGB values for fiber (between 0 and 255)
NrOfFibers:

121

 
   
Loop over number of fibers:

 

 
NrOfPoints:

<points>

 
X Y Z * points (float)

101.209 128.266 120.192 

 

 

Newer information (see DTI Getting Started Guide 1.1):

This is the coordinate system in the OpenGL/3D Viewer window.
Origin: [x, y, z] = 0.5*VMR slice X-resolution, 0.5*VMR slice Y-resolution, 0.5*number of slices 

x-axis: anterior to posterior 0 to X-resolution 

y-axis: superior to inferior 0 to Y-resolution 

z-axis: right to left 0 to Z-resolution