Vector Grid Data Attribute
| Tag | (0064,0009) |
|---|---|
| Type | Required (1) |
| Keyword | VectorGridData |
| Value Multiplicity | 1 |
| Value Representation | Other Float String (OF) |
A data stream of vectors describing the direction and magnitude of the deformation in mm. See Section C.20.3.1.3 for further explanation.
Section C.20.3.1.3
C.20.3.1.3 Vector Grid Data
Vector Grid Data (0064,0009) contains the vector data. Each voxel in Vector Grid Data (0064,0009) is represented by an
vector. The vector describes the direction and magnitude of the deformation (in mm) at the center of the deformation voxel.
The order of vectors encoded for each vector plane shall be left to right, top to bottom, i.e., the upper left vector (labeled 1,1) is encoded first followed by the remainder of row 1, followed by the first vector of row 2 (labeled 2,1) then the remainder of row 2 and so on.
A vector triple with values of (NaN,NaN,NaN) shall indicate that the transformation at that point of the deformation grid is undefined.
The size of this Attribute value is determined by the dimensions specified in Grid Dimensions (0064,0007). For dimensions of XD\YD\ZD, the size of the Attribute value can be calculated with Equation C.20.3-2.
Equation C.20.3-2.