DICOM PS3.3 2020b - Information Object Definitions
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.


DICOM PS3.3 2020b - Information Object Definitions