DICOM PS3.3 2019c - Information Object Definitions

C.8.14.2 MR Spectroscopy Pulse Sequence Module

The primary purpose of this Module is to identify the pulse sequence and variations that were used in creation of the spectroscopic data. Terminology is intended to be neutral, and allow equivalent pulse sequences provided by different vendors to be classified together.

Table C.8-103 specifies the Attributes of the MR Spectroscopy Pulse Sequence Module.

Table C.8-103. MR Spectroscopy Pulse Sequence Module Attributes

Attribute Name

Tag

Type

Attribute Description

Pulse Sequence Name

(0018,9005)

1C

Name of the pulse sequence for annotation purposes. Potentially vendor-specific name.

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

MR Spectroscopy Acquisition Type

(0018,9200)

1C

Identification of data encoding scheme.

Defined Terms:

SINGLE_VOXEL

ROW

PLANE

VOLUME

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Echo Pulse Sequence

(0018,9008)

1C

Echo category of pulse sequences.

Enumerated Values:

SPIN

GRADIENT

BOTH

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Multiple Spin Echo

(0018,9011)

1C

Multiple Spin Echo category of pulse sequence used to collect different lines in k-space for a single frame.

Enumerated Values:

YES

NO

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Echo Pulse Sequence (0018,9008) equals SPIN or BOTH.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and Echo Pulse Sequence (0018,9008) equals SPIN or BOTH.

Multi-planar Excitation

(0018,9012)

1C

Technique that simultaneously excites several volumes.

Enumerated Values:

YES

NO

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Steady State Pulse Sequence

(0018,9017)

1C

Steady State Sequence.

Defined Terms:

FREE_PRECESSION

TRANSVERSE

TIME_REVERSED

LONGITUDINAL

NONE

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Echo Planar Pulse Sequence

(0018,9018)

1C

Echo Planar category of pulse sequences.

Enumerated Values:

YES

NO

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Spectrally Selected Suppression

(0018,9025)

1C

Spectrally Selected Suppression.

Defined Terms:

WATER

FAT

FAT_AND_WATER

SILICON_GEL

NONE

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Geometry of k-Space Traversal

(0018,9032)

1C

Geometry category of k-Space traversal.

Defined Terms:

RECTILINEAR

RADIAL

SPIRAL

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Rectilinear Phase Encode Reordering

(0018,9034)

1C

Rectilinear phase encode reordering.

Defined Terms:

LINEAR

CENTRIC

SEGMENTED

REVERSE_LINEAR

REVERSE_CENTRIC

Required if Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Geometry of k-Space Traversal (0018,9032) equals RECTILINEAR.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and Geometry of k-Space Traversal (0018,9032) equals RECTILINEAR.

Segmented k-Space Traversal

(0018,9033)

1C

Segmented k-Space traversal. If Geometry of k-Space Traversal is rectilinear, multiple lines can be acquired at one time. If Geometry of k-Space Traversal is spiral or radial, paths can be interleaved and acquired at one time.

Enumerated Values:

SINGLE

successive single echo coverage

PARTIAL

segmented coverage

FULL

single shot full coverage

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Coverage of k-Space

(0018,9094)

1C

Coverage of k-Space.

Defined Terms:

FULL

CYLINDRICAL

ELLIPSOIDAL

WEIGHTED

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and MR Spectroscopy Acquisition Type (0018,9200) equals VOLUME.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and MR Spectroscopy Acquisition Type (0018,9200) equals VOLUME.

Number of k-Space Trajectories

(0018,9093)

1C

Number of interleaves or shots.

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED. May be present otherwise.

Echo Peak Position

(0018,9298)

3

Number specifying the sample that coincides with the echo peak used during acquisition of the data. First sample will be numbered 1.


DICOM PS3.3 2019c - Information Object Definitions