DICOM PS3.3 2019a - Information Object Definitions

C.8.13.4 MR Pulse Sequence Module

The primary purpose of this Module is to identify the pulse sequence and variations on that, which was used in creation of the image. Terminology is intended to be neutral, and allow equivalent sequences provided by different vendors to be classified the same.

Table C.8-87 specifies the Attributes of the MR Pulse Sequence Module.

Table C.8-87. MR 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 Acquisition Type

(0018,0023)

1C

Identification of spatial data encoding scheme.

Defined Terms:

1D

2D

3D

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.

Phase Contrast

(0018,9014)

1C

Phase contrast pulse sequence is a pulse sequence in which the flowing spins are velocity encoded in phase.

Enumerated Values:

YES

NO

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

Velocity Encoding Acquisition Sequence

(0018,9092)

1C

Velocity encoding directions used for acquisition.

Required if Phase Contrast (0018,9014) equals YES.

One or more Items shall be included in this Sequence.

>Velocity Encoding Direction

(0018,9090)

1

The direction cosines of the velocity encoding vector with respect to the patient. See Section C.7.6.2.1.1 for further explanation.

Time of Flight Contrast

(0018,9015)

1C

Time of Flight contrast is created by the inflow of blood in the saturated plane.

Enumerated Values:

YES

NO

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

Arterial Spin Labeling Contrast

(0018,9250)

1C

Arterial Spin Labeling contrast technique.

Enumerated Values:

CONTINUOUS

a single long low powered RF pulse

PSEUDOCONTINUOUS

multiple short low powered RF pulses

PULSED

a single short high powered RF pulse

Required if Image Type (0008,0008) Value 3 is ASL. 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.

Saturation Recovery

(0018,9024)

1C

Saturation recovery pulse sequence.

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:

FAT

WATER

FAT_AND_WATER

SILICON_GEL

NONE

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

Oversampling Phase

(0018,9029)

1C

Oversampling Phase.

Enumerated Values:

2D

phase direction

3D

out of plane direction

2D_3D

both

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 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 in the ky-kz plane.

Defined Terms:

FULL

CYLINDRICAL

ELLIPSOIDAL

WEIGHTED

Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and MR Acquisition Type (0018,0023) equals 3D.

Otherwise may be present if Image Type (0008,0008) Value 1 is DERIVED and MR Acquisition Type (0018,0023) equals 3D.

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.


DICOM PS3.3 2019a - Information Object Definitions