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DICOM PS3.3 2020a - Information Object Definitions​ Page 961​

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.​

 

 

 

RequiredifFrameType(0008,9007)Value1ofthisframeisORIGINAL.​

 

 

 

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​

To be used when Frame Type (0008,9007) value 4​

 

 

 

NONE​

 

 

 

 

equals DIFFUSION_ANISO or Diffusion b-value​

 

 

 

 

(0018,9087) is 0 (zero).​

 

 

 

RequiredifFrameType(0008,9007)Value1ofthisframeisORIGINAL.​

 

 

 

May be present otherwise.​

>DiffusionGradientDirection​

(0018,9076)​

1C​

Sequencecontainingorientationsofalldiffusionsensitizationgradients​

Sequence​

 

 

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​

 

 

 

MaybepresentifDiffusionDirectionality(0018,9075)equalsBMATRIX.​

>>Diffusion Gradient​

(0018,9089)​

1C​

The direction cosines of the diffusion gradient vector with respect to​

Orientation​

 

 

the patient​

 

 

 

 

RequiredifFrameType(0008,9007)Value1ofthisframeisORIGINAL.​

 

 

 

May be present otherwise.​

>Diffusion b-matrix​

(0018,9601)​

1C​

The directional diffusion sensitization expressed as a 3x3 matrix with​

Sequence​

 

 

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].​

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Page 962​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>>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.​

C.8.13.5.10 MR Averages Macro​

Table C.8-97 specifies the Attributes of the MR Averages Functional Group Macro.​

Table C.8-97. MR Averages Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR Averages Sequence​

(0018,9119)​

1​

Identifies the averaging parameters of this frame.​

 

 

 

Only a single Item shall be included in this Sequence.​

>Number of Averages​

(0018,0083)​

1C​

Maximum number of times any point in k-space is acquired.​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

ORIGINAL. May be present otherwise.​

C.8.13.5.11 MR Spatial Saturation Macro​

Table C.8-98 specifies the Attributes of the MR Spatial Saturation Functional Group Macro.​

Table C.8-98. MR Spatial Saturation Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR Spatial Saturation​

(0018,9107)​

2​ A Sequence that provides the position of spatial saturation bands​

Sequence​

 

 

deposited as part of the pulse sequence.​

 

 

 

Zero or more Items shall be included in this Sequence.​

>Slab Thickness​

(0018,9104)​

1​ Thickness of slab in mm.​

>Slab Orientation​

(0018,9105)​

1​ The direction cosines of a normal vector perpendicular to the​

 

 

 

saturationplanewithrespecttothepatient.SeeSectionC.7.6.2.1.1​

 

 

 

for further explanation.​

>Mid Slab Position​

(0018,9106)​

1​ The x, y, and z coordinates of the midpoint of the slab plane in mm​

 

 

 

with respect to the patient. See Section C.7.6.2.1.1 for further​

 

 

 

explanation.​

C.8.13.5.12 MR Metabolite Map Macro​

Table C.8-99 specifies the Attributes of the MR Metabolite Map Functional Group Macro.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 963​

Table C.8-99. MR Metabolite Map Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR Metabolite Map Sequence​

(0018,9152)​

1​

Describes the chemical shift parameters used to measure the​

 

 

 

resonantpeaksfromwhichtheMRmetabolitemaprepresented​

 

 

 

by this frame was derived.​

 

 

 

Only a single Item shall be included in this Sequence.​

>Metabolite Map Description​

(0018,9080)​

1C​

Text describing the Metabolite Map.​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

ORIGINAL. May be present otherwise.​

>MetaboliteMapCodeSequence​

(0018,9083)​

3​

When the measured peaks or their ratios can be related to​

 

 

 

metabolitesubstances,thisSequencemaybeusedtodescribe​

 

 

 

the metabolite substance whose resonant peaks are mapped​

 

 

 

in the Metabolite Map, or the ratio of substance resonant peaks​

 

 

 

that is mapped.​

 

 

 

Only a single Item shall be included in this Sequence.​

>>Include Table 8.8-1 “Code Sequence Macro Attributes”​

DCID 4032 “MR Spectroscopy Metabolites”.​

>Chemical Shift Sequence​

(0018,9084)​

3​

The list of frequencies that were used to create the Metabolite​

 

 

 

Map.​

 

 

 

One or more Items are permitted in this Sequence.​

>>Chemical Shift Minimum​

(0018,9295)​

1​

Minimal value of Chemical Shift Frequency in ppm.​

Integration Limit in ppm​

 

 

 

>>Chemical Shift Maximum​

(0018,9296)​

1​

Maximum value of Chemical Shift Frequency in ppm.​

Integration Limit in ppm​

 

 

 

C.8.13.5.13 MR Velocity Encoding Macro​

Table C.8-100 specifies the Attributes of the MR Velocity Encoding Functional Group Macro. This Functional Group contains the ve-​ locity encoding values as valid for the reconstructed Images, rather than for their acquisition. The velocity encoding directions for​ acquisition are described in the Velocity Encoding Acquisition Sequence (0018,9092) defined in the MR Pulse Sequence Module.​

Table C.8-100. MR Velocity Encoding Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MRVelocityEncodingSequence​

(0018,9197)​

1​

Identifies the velocity encoding of this frame.​

 

 

 

One or more Items shall be included in this Sequence.​

>Velocity Encoding Direction​

(0018,9090)​

1C​

The direction cosines of the velocity encoding vector with respect​

 

 

 

to the patient. See Section C.7.6.2.1.1 and Section C.8.13.5.13.1​

 

 

 

for further explanation.​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

ORIGINAL. May be present otherwise.​

>Velocity Encoding Minimum​

(0018,9091)​

1C​

Minimum velocity in cm/s.​

Value​

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

 

 

 

ORIGINAL. May be present otherwise.​

>Velocity Encoding Maximum​

(0018,9217)​

1C​

Maximum velocity in cm/s.​

Value​

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

 

 

 

ORIGINAL. May be present otherwise.​

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Page 964​

DICOM PS3.3 2020a - Information Object Definitions​

C.8.13.5.13.1 Velocity Encoding Direction​

The direction of the flow in a flow image is defined by the direction of the relevant flow vector in the MR Velocity Encoding Sequence​ (0018,9197).​

Theactualflowvalue(asspecifiedintheRealWorldValueMappingSequence(0040,9096))hasapositivesignwhentheflowdirection​ coincides with the Velocity Encoding Direction (0018,9090) vector.​

C.8.13.5.14 MR Arterial Spin Labeling Macro​

Table C.8-100b specifies the Attributes of the MR Arterial Spin Labeling Functional Group Macro.​

Table C.8-100b. MR Arterial Spin Labeling Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR Arterial Spin Labeling​

(0018,9251)​

1​

A Sequence that provides the position of Arterial Spin Labeling​

Sequence​

 

 

regions deposited as part of the pulse sequence.​

 

 

 

One or more Items shall be included in this Sequence.​

>ASL Technique Description​

(0018,9252)​

2​

Text describing the used labeling technique in more detail.​

>ASL Context​

(0018,9257)​

1C​

The purpose of the Arterial Spin Labeling.​

 

 

 

Enumerated Values:​

 

 

 

LABEL​

 

 

 

CONTROL​

 

 

 

M_ZERO_SCAN​

 

 

 

RequiredifFrameType(0008,9007)isORIGINAL.Maybepresent​

 

 

 

otherwise.​

 

 

 

See Section C.8.13.5.14.1 for further explanation.​

>ASL Slab Sequence​

(0018,9260)​

1C​

SequencedescribingtheASLSlabgeometryandanatomicalregion.​

 

 

 

One or more Items shall be included in this Sequence.​

 

 

 

RequiredifASLContext(0018,9257)isCONTROLorLABEL.May​

 

 

 

be present otherwise.​

>>ASL Slab Number​

(0018,9253)​

1​

Consecutivenumberidentifyingthedifferentslabsusedforlabeling,​

 

 

 

starting with 1.​

>>Include Table 10-7 “General Anatomy Optional Macro​ Attributes”​

>>ASL Slab Thickness​

(0018,9254)​

1​

>>ASL Slab Orientation​

(0018,9255)​

1​

The anatomical region where the slab is positioned.​

Defined CID for the Anatomic Region Sequence (0008,2218) is​ CID 4030 “CT, MR and PET Anatomy Imaged”.​

Defined CID for Anatomic Region Modifier Sequence (0008,2220)​ and Primary Anatomic Structure Modifier Sequence (0008,2230)​ is CID 2 “Anatomic Modifier”.​

Thickness of slab in mm.​

The direction cosines of a normal vector perpendicular to the ASL​ slab with respect to the patient. See Section C.7.6.2.1.1 for further​ explanation.​

>>ASL Mid Slab Position​

(0018,9256)​

1​

The x, y, and z coordinates of the midpoint of the slab in mm with​

 

 

 

respect to the patient. See Section C.7.6.2.1.1 for further​

 

 

 

explanation.​

>>ASL Pulse Train Duration​

(0018,9258)​

1​

Duration (in milliseconds) of the Label or Control pulse.​

 

 

 

See Section C.8.13.5.14.3 for further explanation.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 965​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>ASL Crusher Flag​

(0018,9259)​

1​

Indicates if an ASL Crusher Method has been used.​

 

 

 

 

Enumerated Values:​

 

 

 

 

YES​

 

 

 

 

NO​

 

 

 

 

See Section C.8.13.5.14.2 for further explanation.​

 

>ASL Crusher Flow Limit​

(0018,925A)​

1C​

Maximum Flow Limit (in cm/s).​

 

 

 

 

Required if ASL Crusher Flag (0018,9259) is YES.​

 

>ASL Crusher Description​

(0018,925B)​

1C​

Description of the ASL Crusher Method. Required if ASL Crusher​

 

 

 

Flag (0018,9259) is YES.​

 

>ASL Bolus Cut-off Flag​

(0018,925C)​

1​

Indicates if a Bolus Cut-off technique is used.​

 

 

 

 

Enumerated Values:​

 

 

 

 

YES​

 

 

 

 

NO​

 

>ASL Bolus Cut-off Timing​

(0018,925D)​

1C​

Sequence that specifies the timing of the Bolus Cut-off technique​

Sequence​

 

 

and possibly its (scientific) description.​

 

 

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

 

Required if ASL Bolus Cut-off Flag (0018,925C) is YES.​

>>ASL Bolus Cut-off Delay​

(0018,925F)​

1​

Bolus Cut-off pulse delay time (in ms).​

 

Time​

 

 

See Section C.8.13.5.14.3 for further explanation.​

 

 

 

 

 

>>ASL Bolus Cut-off​

(0018,925E)​

2​

Text describing the cut-off technique.​

 

Technique​

 

 

 

 

C.8.13.5.14.1 ASL Context​

The Attribute ASL Context (0018,9257) categorize the Original ASL images according to three contexts. This categorization allows​ post processing applications to select the correct type of image.​

LABEL: Images are acquired with magnetically labeled arterial blood supply.​

CONTROL: Images are acquired with a 'control' pulse in the proximal vessels.​

M_ZERO_SCAN: Images are acquired with no label or control pulse in the proximal vessels.​

C.8.13.5.14.2 ASL Crusher Flag​

Inordertoquantifytheperfusionaccurately,itmaybenecessarytosuppresssignalswithinthemacroscopicbloodvessels(crushing).​ Thiscanbeusedtoseparatethearterialinputfunctionfromthebrainparenchymalsignal.TheASLCrusherFlag(0018,9259)indicates​ the application of an ASL crushing technique.​

Note​

Frames with and without crushing may be present in one SOP Instance.​

C.8.13.5.14.3 Relationship of ASL Timing Attributes​

The general description of the ASL Acquisition technique requires a number of time related Attributes that are depicted in Fig-​ ure C.8.13.5.14-1.​

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