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C.8.13.5.9 MR Diffusion Macro (Current)
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##### C.8.13.5.9 MR Diffusion Macro

Table C.8-96 specifies the Attributes of the MR Diffusion Functional Group Macro.

Table C.8-96. MR 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 Section 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.

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DICOM PS3.3 2020e - Information Object Definitions