C.8.13.5.9 MR Diffusion Macro

Table C.8-96 specifies the attributes of the MR Diffusion Functional Group macro.

Table C.8-96MR DIFFUSION MACRO ATTRIBUTES

Attribute Name Tag Type Attribute Description
MR Diffusion Sequence (0018,9117) 1 Identifies the diffusion parameters of this frame. Only a single Item shall be included in this sequence.
>Diffusion b-value (0018,9087) 1C Diffusion sensitization factor in sec/mm2. This is the actual b-value for original frames and those derived from frames with the same b-value, or the most representative b-value when derived from images with different b-values. Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.
>Diffusion Directionality (0018,9075) 1C Specifies whether diffusion conditions for the frame are directional, or isotropic with respect to direction. Defined Terms: DIRECTIONAL BMATRIX ISOTROPIC NONE = to be used when Frame Type (0008,9007) value 4 equals DIFFUSION_ANISO or Diffusion b-value (0018,9087) is 0 (zero). Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.
>Diffusion Gradient Direction Sequence (0018,9076) 1C Sequence containing orientations of all diffusion sensitization gradients that were applied during the acquisition of this frame. Only a single Item shall be included in this sequence. Required if Diffusion Directionality (0018,9075) equals DIRECTIONAL May be present if Diffusion Directionality (0018,9075) equals BMATRIX.
>>Diffusion Gradient Orientation (0018,9089) 1C The direction cosines of the diffusion gradient vector with respect to the patient Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.
>Diffusion b-matrix Sequence (0018,9601) 1C The directional diffusion sensitization expressed as a 3x3 matrix with diagonal symmetry (with six unique elements from which the other elements can be derived). The rows and columns of the matrix are the X (right to left), Y (anterior to posterior) and Z (foot to head) patient-relative orthogonal axes as defined in C.7.6.2.1.1. The values are in units of ms/mm2. Only a single Item shall be included in this sequence. Required if Diffusion Directionality (0018,9075) equals BMATRIX.
>>Diffusion b-value XX (0018,9602) 1 The value of b[X,X].
>>Diffusion b-value XY (0018,9603) 1 The value of b[X,Y].
>>Diffusion b-value XZ (0018,9604) 1 The value of b[X,Z].
>>Diffusion b-value YY (0018,9605) 1 The value of b[Y,Y].
>>Diffusion b-value YZ (0018,9606) 1 The value of b[Y,Z].
>>Diffusion b-value ZZ (0018,9607) 1 The value of b[Z,Z].
>Diffusion Anisotropy Type (0018,9147) 1C Class of diffusion anisotropy calculation. Defined Terms: FRACTIONAL RELATIVE VOLUME_RATIO Required if Frame Type (0008,9007) value 4 equals DIFFUSION_ANISO.