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DICOM PS3.3 2020a - Information Object Definitions​ Page 631​

Table C.8.2.2-4. Multi-energy CT Path Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Multi-energyCTPathSequence​

(0018,9379)​

1​ Describes the paths corresponding to each energy level of a​

 

 

 

Multi-energy acquisition. Each path consists of a source (see​

 

 

 

Section C.8.2.1.1.1) and a detector (see Section C.8.2.2.1.1).​

 

 

 

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

 

 

 

See also Section C.8.2.2.1 and Section C.8.2.2.2.​

>Multi-energy CT Path Index​

(0018,937A)​

1​ Identification number of the element in the Multi-energy CT Path​

 

 

 

Sequence.​

 

 

 

The number shall be 1 for the first Item and increase by 1 for each​

 

 

 

subsequent Item.​

>Referenced X-Ray Source​

(0018,9377)​

1​ References the X-Ray Source Index (0018,9366) in the Multi-energy​

Index​

 

 

CT X-Ray Source Sequence (0018,9365) in this path.​

>Referenced X-Ray Detector​

(0018,9376)​

1​ ReferencestheX-RayDetectorIndex(0018,9370)intheMulti-energy​

Index​

 

 

CT X-Ray Detector Sequence (0018,936F) in this path.​

C.8.3 MR Modules​

This Section describes the MR Image Module. This Module contains all Attributes that are specific to MR images.​

C.8.3.1 MR Image Module​

Table C.8-4 contains the Attributes that describe MR images.​

Table C.8-4. MR Image Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Image Type​

(0008,0008)​

1​ Image identification characteristics. See Section C.8.3.1.1.1 for​

 

 

 

specialization.​

Samples per Pixel​

(0028,0002)​

1​ Number of samples (planes) in this image. See Section C.8.3.1.1.2​

 

 

 

for specialization.​

Photometric Interpretation​

(0028,0004)​

1​ Specifies the intended interpretation of the pixel data. See​

 

 

 

Section C.8.3.1.1.3 for specialization.​

Bits Allocated​

(0028,0100)​

1​ Number of bits allocated for each pixel sample. Each sample shall​

 

 

 

have the same number of bits allocated. See Section C.8.3.1.1.4 for​

 

 

 

specialization.​

Bits Stored​

(0028,0101)​

1​ Numberofbitsstoredforeachpixelsample.Eachsampleshallhave​

 

 

 

the same number of bits stored.​

High Bit​

(0028,0102)​

1​ Most significant bit for pixel sample data. Each sample shall have​

 

 

 

the same high bit. High Bit (0028,0102) shall be one less than Bits​

 

 

 

Stored (0028,0101).​

- Standard -​

Page 632​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

 

Attribute Description​

Scanning Sequence​

(0018,0020)​

1​

Description of the type of data taken.​

 

 

 

Enumerated Values:​

 

 

 

SE​Spin Echo​

 

 

 

IR​Inversion Recovery​

 

 

 

GR​Gradient Recalled​

 

 

 

EP​Echo Planar​

 

 

 

RM​Research Mode​

 

 

 

Note​

 

 

 

Multi-valued,butnotallcombinationsarevalid(e.g.,SE/GR,​

 

 

 

etc.).​

Sequence Variant​

(0018,0021)​

1​

Variant of the Scanning Sequence.​

 

 

 

Defined Terms:​

 

 

 

SK​

segmented k-space​

 

 

 

MTC​ magnetization transfer contrast​

 

 

 

SS​

steady state​

 

 

 

TRSS​time reversed steady state​

 

 

 

SP​

spoiled​

 

 

 

MP​

MAG prepared​

 

 

 

OSP​ oversampling phase​

 

 

 

NONE​no sequence variant​

Scan Options​

(0018,0022)​

2​

Parameters of scanning sequence.​

 

 

 

Defined Terms:​

 

 

 

PER​Phase Encode Reordering​

 

 

 

RG​ Respiratory Gating​

 

 

 

CG​ Cardiac Gating​

 

 

 

PPG​Peripheral Pulse Gating​

 

 

 

FC​ Flow Compensation​

 

 

 

PFF​Partial Fourier - Frequency​

 

 

 

PFP​Partial Fourier - Phase​

 

 

 

SP​ Spatial Presaturation​

 

 

 

FS​ Fat Saturation​

MR Acquisition Type​

(0018,0023)​

2​

Identification of data encoding scheme.​

 

 

 

Enumerated Values:​

 

 

 

2D​frequency x phase​

 

 

 

3D​frequency x phase x phase​

Repetition Time​

(0018,0080)​

2C​

The period of time in msec between the beginning of a pulse​

 

 

 

sequenceandthebeginningofthesucceeding(essentiallyidentical)​

 

 

 

pulse sequence.​

 

 

 

Required if Sequence Variant (0018,0021) is SK or if Scanning​

 

 

 

Sequence (0018,0020) is not EP. May be present otherwise.​

Echo Time​

(0018,0081)​

2​

Time in ms between the middle of the excitation pulse and the peak​

 

 

 

of the echo produced (kx=0). In the case of segmented k-space, the​

 

 

 

TE(eff) is the time between the middle of the excitation pulse to the​

 

 

 

peak of the echo that is used to cover the center of k-space (i.e.,​

 

 

 

-kx=0, ky=0).​

Echo Train Length​

(0018,0091)​

2​

Number of lines in k-space acquired per excitation per image.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 633​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Inversion Time​

(0018,0082)​

2C​

Time in msec after the middle of inverting RF pulse to middle of​

 

 

 

excitation pulse to detect the amount of longitudinal magnetization.​

 

 

 

Required if Scanning Sequence (0018,0020) has values of IR.​

Trigger Time​

(0018,1060)​

2C​

Time, in msec, between peak of the R wave and the peak of the​

 

 

 

echoproduced.Inthecaseofsegmentedk-space,theTE(eff)isthe​

 

 

 

time between the peak of the echo that is used to cover the center​

 

 

 

ofk-space.RequiredforScanOptions(0018,0022)thatincludeheart​

 

 

 

gating (e.g., CG, PPG, etc.)​

 

Sequence Name​

(0018,0024)​

3​

User defined name for the combination of Scanning Sequence​

 

 

 

(0018,0020) and Sequence Variant (0018,0021).​

 

Angio Flag​

(0018,0025)​

3​

Angio Image Indicator. Primary image for Angio processing.​

 

 

 

Enumerated Values:​

 

 

 

 

Y​Image is Angio​

 

 

 

 

N​Image is not Angio​

 

Number of Averages​

(0018,0083)​

3​

Number of times a given pulse sequence is repeated before any​

 

 

 

parameter is changed​

 

Imaging Frequency​

(0018,0084)​

3​

Precession frequency in MHz of the nucleus being addressed​

Imaged Nucleus​

(0018,0085)​

3​

Nucleus that is resonant at the imaging frequency. Examples: 31P,​

 

 

 

1H​

 

Echo Number(s)​

(0018,0086)​

3​

The echo number used in generating this image. In the case of​

 

 

 

segmented k-space, it is the effective Echo Number.​

 

Magnetic Field Strength​

(0018,0087)​

3​

Nominal field strength of MR magnet, in Tesla​

 

Spacing Between Slices​

(0018,0088)​

3​

Spacing between slices, in mm. The spacing is measured from the​

 

 

 

center-to-center of each slice.​

 

NumberofPhaseEncoding​

(0018,0089)​

3​

Total number of lines in k-space in the 'y' direction collected during​

Steps​

 

 

acquisition.​

 

Percent Sampling​

(0018,0093)​

3​

Fractionofacquisitionmatrixlinesacquired,expressedasapercent.​

Percent Phase Field of​

(0018,0094)​

3​

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

View​

 

 

dimension in frequency direction, expressed as a percent.​

Pixel Bandwidth​

(0018,0095)​

3​

Reciprocal of the total sampling period, in hertz per pixel.​

Nominal Interval​

(0018,1062)​

3​

Average R-R interval used for the scans, in msec​

 

Beat Rejection Flag​

(0018,1080)​

3​

Beat length sorting has been applied.​

 

 

 

 

Enumerated Values:​

 

 

 

 

Y​yes​

 

 

 

 

N​no​

 

Low R-R Value​

(0018,1081)​

3​

R-R interval low limit for beat rejection, in msec​

 

High R-R Value​

(0018,1082)​

3​

R-R interval high limit for beat rejection, in msec​

 

Intervals Acquired​

(0018,1083)​

3​

Number of R-R intervals acquired.​

 

Intervals Rejected​

(0018,1084)​

3​

Number of R-R intervals rejected.​

 

PVC Rejection​

(0018,1085)​

3​

Description of type of PVC rejection criteria used.​

 

Skip Beats​

(0018,1086)​

3​

Number of beats skipped after a detected arrhythmia.​

 

Heart Rate​

(0018,1088)​

3​

Beats per minute.​

 

Cardiac Number of Images​

(0018,1090)​

3​

Number of images per cardiac cycle.​

 

Trigger Window​

(0018,1094)​

3​

PercentofR-Rinterval,basedonHeartRate(0018,1088),prescribed​

 

 

 

as a window for a valid/usable trigger.​

 

- Standard -​

Page 634​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Reconstruction Diameter​

(0018,1100)​

3​ Diameter in mm. of the region from within which data were used in​

 

 

 

creatingthereconstructionoftheimage.Datamayexistoutsidethis​

 

 

 

region and portions of the patient may exist outside this region.​

 

 

 

Thediameterdefinesacircularregionthatisentirelycontainedwithin​

 

 

 

the encoded Pixel Data (7FE0,0010), unless the encoded image​

 

 

 

has been cropped after reconstruction.​

 

 

 

Note​

 

 

 

If not cropped or padded, for square images with square​

 

 

 

pixels, both values of Pixel Spacing (0028,0030) will be​

 

 

 

equal and equal to Reconstruction Diameter (0018,1100)​

 

 

 

/ Rows (0028,0010) and Reconstruction Diameter​

 

 

 

(0018,1100) / Columns (0028,0011).​

Receive Coil Name​

(0018,1250)​

3​

Receive coil used.​

Transmit Coil Name​

(0018,1251)​

3​

Transmit coil used.​

Acquisition Matrix​

(0018,1310)​

3​ Dimensions of the acquired frequency /phase data before​

 

 

 

reconstruction.​

 

 

 

Multi-valued:frequencyrows\frequencycolumns\phaserows\phase​

 

 

 

columns.​

In-plane Phase Encoding​

(0018,1312)​

3​ The axis of phase encoding with respect to the image.​

Direction​

 

 

Enumerated Values:​

 

 

 

 

 

 

ROW​phase encoded in rows.​

 

 

 

COL​phase encoded in columns.​

Flip Angle​

(0018,1314)​

3​ Steadystateangleindegreestowhichthemagneticvectorisflipped​

 

 

 

from the magnetic vector of the primary field.​

SAR​

(0018,1316)​

3​ Calculated whole body Specific Absorption Rate in watts/kilogram.​

Variable Flip Angle Flag​

(0018,1315)​

3​ Flip angle variation applied during image acquisition.​

 

 

 

Enumerated Values:​

 

 

 

Y​yes​

 

 

 

N​no​

dB/dt​

(0018,1318)​

3​ The rate of change of the gradient coil magnetic flux density with​

 

 

 

time (T/s).​

TemporalPositionIdentifier​

(0020,0100)​

3​ Temporal order of a dynamic or functional set of Images.​

Number of Temporal​

(0020,0105)​

3​ Total number of temporal positions prescribed.​

Positions​

 

 

 

Temporal Resolution​

(0020,0110)​

3​ TimedeltabetweenImagesinadynamicorfunctionalsetofImages.​

IncludeTable10-7“GeneralAnatomyOptionalMacroAttributes”​Defined CID for the Anatomic Region Sequence is CID 4030 “CT,​ MR and PET Anatomy Imaged”.​

Include Table 10-25 “Optional View and Slice Progression​

Direction Macro Attributes”​

Isocenter Position​ (300A,012C)​ 3​ Isocenter coordinates (x,y,z), in mm. Specifies the location of the​ machine isocenter in the Patient-Based Coordinate System​ associated with the Frame of Reference. It allows transformation​ fromtheEquipment-BasedCoordinateSystemtothePatient-Based​ Coordinate System.​

- Standard -​

 

DICOM PS3.3 2020a

- Information Object Definitions​

Page 635​

Attribute Name​

Tag​

Type​

Attribute Description​

 

B1rms​

(0018,1320)​

3​

 

B1+ rms value in units of micro_tesla (uT) for the acquisition​

 

 

 

 

producing the image. See [IEC 60601-2-33].​

 

C.8.3.1.1 MR Image Attribute Descriptions​

C.8.3.1.1.1 Image Type​

For MR Images, Image Type (0008,0008) is specified to be Type 1.​

Defined Terms for Value 3:​

DENSITY MAP​

DIFFUSION MAP​

IMAGE ADDITION​

MODULUS​

SUBTRACT​

MPR​

OTHER​

PHASE MAP​

PHASE SUBTRACT​

PROJECTIONIMAGE​

T1 MAP​

T2 MAP​

VELOCITY MAP​

C.8.3.1.1.2 Samples Per Pixel​

Enumerated Values:​

1​

C.8.3.1.1.3 Photometric Interpretation​

Enumerated Values:​

MONOCHROME1​

MONOCHROME2​

See Section C.7.6.3.1.2 for definition of these terms.​

C.8.3.1.1.4 Bits Allocated​

Enumerated Values:​

16​

C.8.4 Nuclear Medicine Modules​

This Section describes Nuclear Medicine Series, Equipment, and Image Modules. These Modules contain Attributes that are specific​ to the NM Image IOD.​

Note​

There are some cases where it may be necessary to use several SOP Instances to encode a single NM acquisition. For​ example, the matrix size must remain constant within a SOP instance. Multiple matrix sizes require multiple SOP instances.​ Similarly, multiple gated stress levels require separate SOP instances for each stress level. However, a receiving AE is not​ expected to recombine them.​

C.8.4.1 NM Series Module (Retired)​

This Section was defined in a previous version of the DICOM Standard. The Section is now retired.​

- Standard -​

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