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DICOM PS3.3 2020a - Information Object Definitions​

Page 651​

Attribute Name​

Tag​

Type​

 

Attribute Description​

 

Type of Detector Motion​

(0054,0202)​

3​

Describes the detector motion during acquisition.​

 

 

 

 

Enumerated Values:​

 

 

 

 

STEP AND SHOOT​Interrupted motion, acquire only while stationary​

 

 

 

CONTINUOUS​

Gantrymotionandacquisitionaresimultaneousand​

 

 

 

 

continuous​

 

 

 

 

ACQDURINGSTEP​Interrupted motion, acquisition is continuous​

C.8.4.12.1 NM Tomo Acquisition Attribute Descriptions​

C.8.4.12.1.1 Angular Step​

AngularStep(0018,1144)isthenominalframe-to-frame incrementalangleforTOMOandGATEDTOMOacquisitionimages,defined​ in degrees. Angular Step (0018,1144) shall be a positive number. Summation of Angular Step values is not defined to give accurate​ Angular Position or Scan Arc values. The Angular Step is the effective angular spacing between resultant frames of the Multi-framed​ planar image data.​

C.8.4.13 NM Multi-gated Acquisition Module​

TableC.8-13containsAttributesthatdescribeamulti-gatedacquisitionimageperformedonthepatient.Thisreferstoframesacquired​ while the patient is connected to a gating device.​

Table C.8-13. NM Multi-Gated Acquisition Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Beat Rejection Flag​

(0018,1080)​

3​

Heart beat duration sorting has been applied.​

 

 

 

Enumerated Values:​

 

 

 

Y​yes​

 

 

 

N​no​

PVC Rejection​

(0018,1085)​

3​

Description of type of arrhythmic beat rejection criteria used.​

Skip Beats​

(0018,1086)​

3​

Number of beats skipped after a detected arrhythmia​

Heart Rate​

(0018,1088)​

3​

Average number of heart beats per minute for the collection period for​

 

 

 

these frames. This shall include all accepted beats as well as rejected​

 

 

 

beats.​

Gated Information​

(0054,0062)​

2C​

Sequence of Items that describe R-R intervals. Each gated interval is​

Sequence​

 

 

defined by an upper and lower range of heart beat durations. Required​

 

 

 

if the Frame Increment Pointer (0028,0009) contains the Tag for R-R​

 

 

 

Interval Vector (0054,0060).​

 

 

 

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

 

 

 

The number of Items shall be equal to Number of R-R Intervals​

 

 

 

(0054,0061). The first Item corresponds to frames with value of 1 in the​

 

 

 

R-R Interval Vector (0054,0060), the second Item with value 2, etc.​

>Trigger Time​

(0018,1060)​

3​

Time interval measured in msec from the start of the R-wave to the​

 

 

 

beginning of the data taking.​

>Cardiac Framing Type​

(0018,1064)​

3​

Description of type of framing performed.​

 

 

 

See Section C.7.6.18.1.1.1 for description and Defined Terms.​

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Page 652​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Data Information​

(0054,0063)​

2​

Sequence of Items that describe gating criteria.​

Sequence​

 

 

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

 

 

 

 

 

 

See Section C.8.4.13.1.1.​

>>Frame Time​

(0018,1063)​

1​

Nominal time per individual frame in msec.​

>>Nominal Interval​

(0018,1062)​

3​

Average duration of accepted beats, in msec.​

>>Low R-R Value​

(0018,1081)​

3​

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

>>High R-R Value​

(0018,1082)​

3​

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

>>Intervals Acquired​

(0018,1083)​

3​

Number of heartbeats that fall within Low R-R Value (0018,1081) and​

 

 

 

HighR-RValue(0018,1082),andwerethereforeacceptedandcontribute​

 

 

 

gamma events to this R-R Interval.​

>>Intervals Rejected​

(0018,1084)​

3​

Number of heartbeats that fall outside Low R-R (0018,1081) and High​

 

 

 

R-R Value (0018,1082), and do not contribute gamma events to this​

 

 

 

R-RInterval.However,theymaycontributegammaeventstootherR-R​

 

 

 

Intervals.​

>>Time Slot Information​

(0054,0072)​

2C​

Sequence of Items that describe Time Slot Information. Required if the​

Sequence​

 

 

Frame Increment Pointer (0028,0009) contains the Tag for Time Slot​

 

 

 

Vector (0054,0070).​

 

 

 

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

 

 

 

The number of Items shall be equal to Number of Time Slots​

 

 

 

(0054,0071). The first Item corresponds to frames with value of 1 in the​

 

 

 

Time Slot Vector (0054,0070), the second Item with value 2, etc.​

>>>Time Slot Time​

(0054,0073)​

3​

The total amount of time, in msec, that the acquisition accumulates​

 

 

 

gamma events into this frame. See Section C.8.4.13.1.2.​

C.8.4.13.1 NM Multi-gated Acquisition Attribute Descriptions​

C.8.4.13.1.1 Data Information Sequence​

Data Information Sequence (0054,0063) shall contain a single Item that applies to the sum of all angular views, except when Image​ Type (0008,0008) Value 3 is GATED TOMO. In this case it shall have either a single Item that applies to the sum of all angular views,​ or it shall have one Item for each angular view.​

C.8.4.13.1.2 Time Slot Time​

The Time Slot Time (0054,0073) records the effective imaging time of each Time Slot. For example, if some of the accepted beats​ are shorter than others then the last frames may not receive a contribution from the shorter beats. The Time Slot Time for a Time​ Slot is the total acquisition time for that Time Slot. It is approximately equal to Frame Time (0018,1063) multiplied by the number of​ accepted beats contributing to the Time Slot.​

C.8.4.14 NM Phase Module​

Table C.8-14 contains Attributes that describe dynamic phases of a dynamic acquisition image performed on the patient. This Module​ is present only when Image Type (0008,0008), Value 3, is equal to DYNAMIC. A phase is defined as a collection of frames in which​ the acquisition time per frame and the time delay between frames remains constant. A new phase shall be defined whenever there​ is a change in the time between frames, the acquisition time per frame, or the position of the patient relative to the detector.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 653​

Table C.8-14. NM Phase Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Phase Information Sequence​

(0054,0032)​

2C​

Sequence of Items that describes each dynamic phase. Required if​

 

 

 

theFrameIncrementPointer(0028,0009)containstheTagforPhase​

 

 

 

Vector (0054,0030).​

 

 

 

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

 

 

 

The number of Items shall be equal to Number of Phases​

 

 

 

(0054,0031). The first Item corresponds to frames with value of 1 in​

 

 

 

Phase Vector (0054,0030), the second Item with value 2, etc.​

>Phase Delay​

(0054,0036)​

1​

Time paused between the last frame of the previous phase and the​

 

 

 

first frame of this phase, in msec.​

>Actual Frame Duration​

(0018,1242)​

1​

Nominal time of acquisition per individual frame, in msec.​

>Pause Between Frames​

(0054,0038)​

1​

Time paused between each frame of this phase (in msec).​

>Number of Frames in Phase​

(0054,0033)​

1​

Number of frames in this phase.​

>Trigger Vector​

(0054,0210)​

3​

An array of trigger times when gating information is acquired​

 

 

 

simultaneously with the dynamic image data. See​

 

 

 

Section C.8.4.14.1.1 for further explanation.​

>NumberofTriggersinPhase​

(0054,0211)​

1C​

The number of entries in Trigger Vector (0054,0210) for this phase.​

 

 

 

Required if Trigger Vector (0054,0210) is present.​

>Phase Description​

(0054,0039)​

3​

Description of this phase of the Dynamic image.​

 

 

 

Enumerated Values:​

FLOW​

WASHOUT​

UPTAKE​

EMPTYING​

EXCRETION​

C.8.4.14.1 NM Phase Module Attributes Description​

C.8.4.14.1.1 Trigger Vector​

Trigger Vector (0054,0210) is an array containing a list of the inter-trigger interval times in milliseconds in the order in which they were​ acquired, with the first being measured from the start time of the first frame of the image data in the Phase. If this element is used,​ the start times are required to be the same so that a mathematical correlation can be made between trigger times and frame start​ times.​

C.8.4.15 NM Reconstruction Module​

Table C.8-15 contains Attributes that describe Nuclear Medicine reconstructed volumes. Reconstructed volumes are created by ap-​ plying a transformation (reconstruction) process to the acquired TOMO frames. This Module is present only when Image Type​ (0008,0008) Value 3 is equal to RECON TOMO or RECON GATED TOMO.​

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Page 654​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8-15. NM Reconstruction Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Spacing Between​

(0018,0088)​

2​ Spacing between slices, in mm, measured from center-to-center of each slice​

Slices​

 

 

along the normal to the first image. The sign of the Spacing Between Slices​

 

 

 

(0018,0088) determines the direction of stacking. The normal is determined by​

 

 

 

the cross product of the direction cosines of the first row and first column of the​

 

 

 

first frame, such that a positive spacing indicates slices are stacked behind the​

 

 

 

first slice and a negative spacing indicates slices are stacked in front of the first​

 

 

 

slice. See Image Orientation (0020,0037) in the NM Detector Module.​

Reconstruction​

(0018,1100)​

3​ Diameter, in mm, of the region from within which the data was used in creating​

Diameter​

 

 

the reconstruction of the image. Data may exist outside this region and portions​

 

 

 

of the patient may exist outside this region.​

 

 

 

Thediameterdefinesacircularregionthatisentirelycontainedwithintheencoded​

 

 

 

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).​

Convolution Kernel​

(0018,1210)​

3​ A label describing the convolution kernel or algorithm used to reconstruct the​

 

 

 

data.​

Slice Thickness​

(0018,0050)​

2​ Nominal slice thickness, in mm.​

Slice Location​

(0020,1041)​

3​ Relative position of the image plane expressed in mm.​

 

 

 

See Section C.7.6.2.1.2 for further explanation.​

Slice Progression​

(0054,0500)​

3​ Describes the anatomical direction that slices are progressing as the slices are​

Direction​

 

 

considered in order (as defined by Slice Vector (0054,0080)). Meaningful only for​

 

 

 

cardiac images.​

When View Code Sequence (0054,0220) indicates a short axis view, then the​

Enumerated Values are:​

Enumerated Values:​

APEX_TO_BASE​

BASE_TO_APEX​

C.8.5 Ultrasound Modules​

This Section describes Modules that contain Attributes that are specific to Ultrasound images.​

C.8.5.1 US Frame of Reference Module (Retired)​

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

C.8.5.2 US Region Calibration (Retired)​

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

C.8.5.3 US Image Module (Retired)​

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

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DICOM PS3.3 2020a - Information Object Definitions​

Page 655​

C.8.5.4 US Frame of Reference Module​

This Section was defined in a previous version of the DICOM Standard. The Section is now retired. See PS3.3-2003.​

C.8.5.5 US Region Calibration Module​

The US Region Calibration Module has been introduced into the ultrasound IOD to provide access to the full range of data that may​ be present in a single US image. US images often contain multiple regions that have independent data regions, e.g., quad screen​ loops that may have different calibration information. The data presented in the various regions of a US image can represent a multi-​ plicity of physical parameters, e.g., spatial distance, blood velocity, time, volume, etc., and these are often contained in the value of​ the pixel itself. It is therefore imperative that physical information be available for the various regions of a single region independent​ of each other.​

Table C.8-17 contains IOD Attributes that describe an ultrasound region calibration.​

Table C.8-17. US Region Calibration Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Sequence of Ultrasound​

(0018,6011)​

1​ Defines a Sequence of Ultrasound Regions.​

Regions​

 

 

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

 

 

 

>Region Location Min x0​

(0018,6018)​

1​ The bounds of a rectangle specifying the location of the region,​

 

 

 

x0,y0,x1,y1.​

 

 

 

See Section C.8.5.5.1.14 for further explanation.​

>Region Location Min y0​

(0018,601A)​

1​ The bounds of a rectangle specifying the location of the region,​

 

 

 

x0,y0,x1,y1.​

 

 

 

See Section C.8.5.5.1.14 for further explanation.​

>Region Location Max x1​

(0018,601C)​

1​ The bounds of a rectangle specifying the location of the region,​

 

 

 

x0,y0,x1,y1.​

 

 

 

See Section C.8.5.5.1.14 for further explanation.​

>Region Location Max y1​

(0018,601E)​

1​ The bounds of a rectangle specifying the location of the region,​

 

 

 

x0,y0,x1,y1.​

 

 

 

See Section C.8.5.5.1.14 for further explanation.​

>Physical Units X Direction​

(0018,6024)​

1​ The physical units of the dimensions of the region.​

 

 

 

See Section C.8.5.5.1.15 for Enumerated Values.​

>Physical Units Y Direction​

(0018,6026)​

1​ The physical units of the dimensions of the region.​

 

 

 

See Section C.8.5.5.1.15 for Enumerated Values.​

>Physical Delta X​

(0018,602C)​

1​ The physical value increments per positive X pixel increment. The units​

 

 

 

are as specified in the Physical Units X Direction (0018,6024).​

 

 

 

See Section C.8.5.5.1.17 for further explanation.​

>Physical Delta Y​

(0018,602E)​

1​ The physical value increments per positive Y pixel increment. The units​

 

 

 

are as specified in the Physical Units Y Direction (0018,6026).​

 

 

 

See Section C.8.5.5.1.17 for further explanation.​

>Reference Pixel x0​

(0018,6020)​

3​ This coordinate pair, x0,y0, defines the location of a virtual "reference"​

 

 

 

pixel.​

See Section C.8.5.5.1.16 for further explanation.​

- Standard -​

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