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DICOM PS3.3 2020a - Information Object Definitions​ Page 951​

Table C.8-88. MR Image Frame Type Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR Image Frame Type​

(0018,9226)​

1​

Identifies the characteristics of this frame.​

Sequence​

 

 

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

 

 

 

>Frame Type​

(0008,9007)​

1​

TypeofFrame.Amulti-valuedAttributeanalogoustoImage​

 

 

 

Type (0008,0008).​

Enumerated Values and Defined Terms are the same as​ those for the four values of Image Type (0008,0008),​ exceptthatthevalueMIXEDisnotallowedunlesstheSOP​ Class UID is "1.2.840.10008.5.1.4.1.1.4.4" (Legacy​ Converted).SeeSectionC.8.16.1andSectionC.8.13.1.1.1.​

>Include Table C.8-131 “Common CT/MR Image Description Macro​

Attributes”​

>Include Table C.8-84 “MR Image Description Macro Attributes”​

C.8.13.5.2 MR Timing and Related Parameters Macro​

Table C.8-89 specifies the Attributes of the MR Timing and Related Parameters Functional Group Macro.​

Table C.8-89. MR Timing and Related Parameters Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR Timing and Related​

(0018,9112)​

1​

Identifies the timing and safety information of this frame.​

Parameters Sequence​

 

 

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

 

 

 

>Repetition Time​

(0018,0080)​

1C​

The time in ms between two successive excitations of the same volume.​

 

 

 

Shall be 0 (zero) if there is a single excitation per volume.​

 

 

 

RequiredifFrameType(0008,9007)Value1ofthisframeisORIGINAL.May​

 

 

 

be present otherwise.​

>Flip Angle​

(0018,1314)​

1C​

Steady state angle in degrees to which the magnetic vector is flipped from​

 

 

 

the magnetic vector of the primary field.​

 

 

 

RequiredifFrameType(0008,9007)Value1ofthisframeisORIGINAL.May​

 

 

 

be present otherwise.​

>Echo Train Length​

(0018,0091)​

1C​

Number of lines in k-space acquired per excitation of the same volume​

 

 

 

regardless of the type of echo or the number of frames derived from them.​

 

 

 

See Section C.8.13.5.2.1.​

 

 

 

RequiredifFrameType(0008,9007)Value1ofthisframeisORIGINAL.May​

 

 

 

be present otherwise.​

>RF Echo Train Length​

(0018,9240)​

1C​

NumberofRFechoescollectedperRFshot(orexcitation)perframe.Avalue​

 

 

 

of zero shall correspond to a pure gradient echo frame. Note that this value​

 

 

 

corresponds to the current frame. Several frames may be derived from the​

 

 

 

same shot. See Section C.8.13.5.2.1.​

RequiredifFrameType(0008,9007)Value1ofthisframeisORIGINAL.May​ be present otherwise.​

- Standard -​

Page 952​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

Attribute Description​

>Gradient Echo Train​

(0018,9241)​

1C​

Number of gradient echoes collected per RF echo per shot (or excitation)​

Length​

 

 

per frame. A value of zero shall correspond to a pure RF echo frame. If RF​

 

 

 

Echo Train Length (0018,9240) is non zero and Gradient Echo Train Length​

 

 

 

is as well then only the central echo will be an RF Spin Echo, all others will​

 

 

 

be gradient echoes. See Section C.8.13.5.2.1.​

 

 

 

RequiredifFrameType(0008,9007)Value1ofthisframeisORIGINAL.May​

 

 

 

be present otherwise.​

>SpecificAbsorptionRate​

(0018,9239)​

1C​

SequencecontainingthemethodsofSARcalculationandthecorresponding​

Sequence​

 

 

values.​

 

 

 

 

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

 

 

 

Required if the system is capable of calculating Specific Absorption Rate​

 

 

 

(0018,9181).​

 

>>Specific Absorption​

(0018,9179)​

1​

SpecificationofthemethodofSARcalculationasdefinedinApplicableSafety​

Rate Definition​

 

 

Standard Description (0018,9175).​

 

 

 

Defined Terms:​

 

 

 

 

IEC_WHOLE_BODY​ [IEC 60601-2-33] Clause 201.3.241​

 

 

 

IEC_PARTIAL_BODY​[IEC 60601-2-33] Clause 201.3.225​

 

 

 

IEC_HEAD​

[IEC 60601-2-33] Clause 201.3.212​

 

 

 

IEC_LOCAL​

[IEC 60601-2-33] Clause 201.3.216​

>>Specific Absorption​

(0018,9181)​

1​

Specific Absorption Rate in W/kg.​

Rate Value​

 

 

 

 

>Gradient Output Type​

(0018,9180)​

1C​

Definition of gradient output unit, for which the value is stored in Gradient​

 

 

 

Output (0018,9182).​

 

 

 

Defined Terms:​

 

 

 

 

DB_DT​

in T/s​

 

 

 

ELECTRIC_FIELD​in V/m​

 

 

 

PER_NERVE_STIM​percentage of peripheral nerve stimulation​

 

 

 

RequiredifthesystemiscapableofcalculatingGradientOutput(0018,9182).​

>Gradient Output​

(0018,9182)​

1C​

Unit is defined by Gradient Output Type (0018,9180).​

 

 

 

RequiredifthesystemiscapableofcalculatingGradientOutput(0018,9182).​

>Operating Mode​

(0018,9176)​

1C​

Sequence of operating mode information relating to the frame/SOP instance​

Sequence​

 

 

asrequiredtoadheretotheApplicableSafetyStandardAgency(0018,9174)​

 

 

 

regulations.​

 

 

 

 

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

 

 

 

Required if required by law or regulations. May be present otherwise.​

>>Operating Mode Type​

(0018,9177)​

1​

Defined Terms:​

 

 

 

 

STATIC FIELD​

 

 

 

 

RF​

 

 

 

 

GRADIENT​

 

>>Operating Mode​

(0018,9178)​

1​

Operating mode applicable for the defined by the applicable standard.​

 

 

 

Defined Terms:​

 

 

 

 

IEC_NORMAL​

[IEC 60601-2-33] Clause 201.3.224​

 

 

 

IEC_FIRST_LEVEL​ [IEC 60601-2-33] Clause 201.3.208​

 

 

 

IEC_SECOND_LEVEL​[IEC 60601-2-33] Clause 201.3.231​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​

Page 953​

C.8.13.5.2.1 RF Echo Train Length and Gradient Echo Train Length Attributes Usage​

The three Echo Train Length Attributes all specify information related to the pulse sequence, one or more frames, and the echo type.​ The following examples illustrate their usage.​

For a sequence with each excitation/shot producing 2 spin echoes that produce a line of k-Space for 2 different frames, the following​ values would be used for each frame:​

Echo Train Length​

2​

Gradient Echo Train Length​

0​

RF Echo Train Length​

1​

For a sequence with each excitation/shot producing 2 gradient echoes that produce a line of k-Space for 2 different frames, the fol-​ lowing values would be used:​

Echo Train Length​

2​

Gradient Echo Train Length​

1​

RF Echo Train Length​

0​

For a sequence with each excitation/shot producing 8 spin echoes that produce 8 lines of k-Space for 1 frame, the following values​ would be used:​

Echo Train Length​

8​

Gradient Echo Train Length​

0​

RF Echo Train Length​

8​

C.8.13.5.3 MR FOV/Geometry Macro​

Table C.8-90 specifies the Attributes of the MR FOV/Geometry Functional Group Macro.​

Table C.8-90. MR FOV/Geometry Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR FOV/Geometry Sequence​

(0018,9125)​

1​

Identifies the geometry parameters of this frame.​

 

 

 

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

>In-plane Phase Encoding​

(0018,1312)​

1C​

The axes of the in-plane phase encoding with respect to the frame.​

Direction​

 

 

Enumerated Values:​

 

 

 

 

 

 

COLUMN​

 

 

 

ROW​

 

 

 

OTHER​

 

 

 

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

 

 

 

ORIGINAL. May be present otherwise.​

>MR Acquisition Frequency​

(0018,9058)​

1C​

Number of Frequency Encoding steps (kx) acquired​

Encoding Steps​

 

 

Required if Frame Type (0008,9007) Value 1 is ORIGINAL. May be​

 

 

 

 

 

 

present otherwise.​

>MR Acquisition Phase​

(0018,9231)​

1C​

Number of In-Plane Phase Encoding steps (ky) acquired​

Encoding Steps in-plane​

 

 

Required if Frame Type (0008,9007) Value 1 is ORIGINAL. May be​

 

 

 

 

 

 

present otherwise.​

- Standard -​

Page 954​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>MR Acquisition Phase​

(0018,9232)​

1C​

Number of Out-of-Plane Phase Encoding steps (kz) acquired​

Encoding Steps out-of-plane​

 

 

Required if MR Acquisition Type (0018,0023) equals 3D and Frame​

 

 

 

 

 

 

Type (0008,9007) Value 1 is ORIGINAL. May be present otherwise.​

>Percent Sampling​

(0018,0093)​

1C​

Fractionofacquisitionmatrixlinesacquired,expressedasapercent.​

 

 

 

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

 

 

 

ORIGINAL. May be present otherwise.​

>Percent Phase Field of View​

(0018,0094)​

1C​

Ratio of field of view dimension in phase direction to field of view​

 

 

 

dimension in frequency direction, expressed as a percent.​

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

ORIGINAL. May be present otherwise.​

C.8.13.5.4 MR Echo Macro​

Table C.8-91 specifies the Attributes of the MR Echo Functional Group Macro.​

Table C.8-91. MR Echo Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR Echo Sequence​

(0018,9114)​

1​

Identifies echo timing of this frame.​

 

 

 

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

>Effective Echo Time​

(0018,9082)​

1C​

The time in ms between the middle of the excitation pulse and the​

 

 

 

peak of the echo produced for kx=0.​

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

ORIGINAL. May be present otherwise.​

C.8.13.5.5 MR Modifier Macro​

Table C.8-92 specifies the Attributes of the MR Modifier Functional Group Macro.​

Table C.8-92. MR Modifier Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

MR Modifier Sequence​

(0018,9115)​

1​

Identifies general acquisition parameters of this frame.​

 

 

 

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

>Inversion Recovery​

(0018,9009)​

1C​

Inversion Recovery preparatory sequence.​

 

 

 

Enumerated Values:​

 

 

 

YES​

 

 

 

NO​

 

 

 

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

 

 

 

be present otherwise.​

>Inversion Times​

(0018,9079)​

1C​

Times in ms after the middle of inverting RF pulse to middle of excitation pulse​

 

 

 

to detect the amount of longitudinal magnetization.​

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

Inversion Recovery (0018,9009) equals YES.​

OtherwisemaybepresentifFrameType(0008,9007)Value1isDERIVEDand​

Inversion Recovery (0018,9009) equals YES.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 955​

Attribute Name​

Tag​

Type​

 

Attribute Description​

 

>Flow Compensation​

(0018,9010)​

1C​

Flow Compensation.​

 

 

 

 

Defined Terms:​

 

 

 

 

 

ACCELERATION​

 

 

 

 

 

VELOCITY​

 

 

 

 

 

OTHER​

 

 

 

 

 

NONE​

 

 

 

 

 

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

 

 

 

be present otherwise.​

 

>Flow Compensation​

(0018,9183)​

1C​

Flow Compensation Direction.​

 

Direction​

 

 

Enumerated Values:​

 

 

 

 

 

 

 

 

PHASE​

 

 

 

 

 

FREQUENCY​

 

 

 

 

 

SLICE_SELECT​

 

 

 

 

 

SLICE_AND_FREQ​

 

 

 

 

 

SLICE_FREQ_PHASE​

 

 

 

 

PHASE_AND_FREQ​

 

 

 

 

SLICE_AND_PHASE​

 

 

 

 

OTHER​

 

 

 

 

 

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

 

 

 

Flow Compensation (0018,9010) equals other than NONE.​

 

 

 

 

OtherwisemaybepresentifFrameType(0008,9007)Value1isDERIVEDand​

 

 

 

Flow Compensation (0018,9010) equals other than NONE.​

 

>Spoiling​

(0018,9016)​

1C​

Spoiling.​

 

 

 

 

 

Enumerated Values:​

 

 

 

 

RF​

RF spoiled​

 

 

 

 

GRADIENT​

gradient spoiled​

 

 

 

 

RF_AND_GRADIENT​

 

 

 

 

 

NONE​

 

 

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

Echo Pulse Sequence (0018,9008) equals GRADIENT or BOTH.​

OtherwisemaybepresentifFrameType(0008,9007)Value1isDERIVEDand​

Echo Pulse Sequence (0018,9008) equals GRADIENT or BOTH.​

>T2 Preparation​

(0018,9021)​

1C​ T2 prepared Pulse Sequence.​

Enumerated Values:​

YES​

NO​

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May​ be present otherwise.​

- Standard -​

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