Appendix: Sdt File Format

 

The sdt file format actually consists of a file pair designated by the extensions, ``.sdt'' and ``.spr''.

{ } xxxx


.sdt
Contains the Signal DaTa and consists of only raw binary data.

.spr
Contains the Signal PaRameters and consists of ASCII attribute:value pairs.

The ``.spr'' file has one ASCII parameter string per line (i.e. newline 'n' terminated). The parameters format consists first of a colon terminated attribute name, followed by a newline terminated value.

There are three mandatory parameters:

{ } xxxxxxxxxx


numDim
The number of dimensions for the data.
dim
The number of data points in each dimension.
dataType
The data type. There are five data types supported as given with their corresponding sizes in Table 13.

  
Table 13: Supported Values for the dataType Attribute.

A minimal ``.spr'' example:

 
numDim: 		 4

dim: 		 64 64 27 110

dataType: 		  REAL

Optional parameters:

{ } xxxxxxxxxxxxx


origin
Position of the center of the first voxel. One value for each dimension. If the origin is not specified, but the fov is, then the image is assumed to be centered:

fov
Field of view: The distance between the outside edges of the first and last voxel along each dimension; one value for each dimension. If the fov is not specified it is calculated according to: fov = interval * dim

interval
The center to center distance between adjacent voxels along each dimension; one value for each dimension. If the interval is not specified it is calculated according to: interval = fov / dim

displayRange
Two values giving the low_value and high_value. Voxel values below the low_value will be displayed as black and voxels with values above the high_value will be displayed as white. Voxels with values within the display range are displayed with a grey value that is scaled linearly between the low_value and high_value.

A typical stimulate ``.spr'' example:

 
numDim: 		 4

dim: 		 128 128 20 150

origin: 		 -10.000000 -10.000000 0.000000 0.000000

fov: 		 20.000000 20.000000 2.000000 15.000000

interval: 		 0.156250 0.156250 1.000000 1.000000

dataType: 		 REAL

displayRange: 		 0.000000 347.904358

fidName: 		 stimFid.sdt

sdtOrient: 		 sag