DICOM PS3.3 2019d - Information Object Definitions

C.8.24.3 Enhanced US Image Module

Table C.8.24.3-1 specifies the Attributes that describe the Enhanced US Image Module. As described in Section A.1.2.6, the Attributes in this Module apply to the first frame of a multi-frame image; any or all of this information may be overridden by Attributes in Per-frame Functional Groups.

Table C.8.24.3-1. Enhanced US Image Module Attributes

Attribute Name

Tag

Type

Attribute Description

Image Type

(0008,0008)

1

Image identification characteristics.

See Section C.8.24.3.2 for specialization.

Samples Per Pixel

(0028,0002)

1

Number of samples per pixel in this image.

Enumerated Values:

1

Photometric Interpretation

(0028,0004)

1

Specifies the intended interpretation of the pixel data.

Enumerated Values:

MONOCHROME2

Bits Allocated

(0028,0100)

1

Number of bits allocated for each pixel sample.

Enumerated Values:

8

16

Bits Stored

(0028,0101)

1

Number of bits stored for each pixel sample. Shall be equal to Bits Allocated (0028,0100).

High Bit

(0028,0102)

1

Most significant bit for pixel sample data. High Bit (0028,0102) shall be one less than Bits Stored (0028,0101).

Pixel Representation

(0028,0103)

1

Data representation of pixel samples. The constrained Enumerated Value implies the VR of all Palette Color Lookup Table Descriptors be US (and not SS).

Enumerated Values:

0000H

unsigned integer

See Section C.8.24.3.1 for specialization.

Dimension Organization Type

(0020,9311)

1

Dimension organization of the instance.

Enumerated Values:

3D

3D_TEMPORAL

See Section C.8.24.3.3 for details.

Acquisition DateTime

(0008,002A)

1

The date and time that the acquisition of data that resulted in this image started.

Acquisition Duration

(0018,9073)

1

Duration of the image acquisition in seconds.

Position Measuring Device Used

(0018,980C)

1C

Describes the type of position measuring device used in the acquisition of the image, if any. This gives an indication of the degree of precision of Pixel Spacing (0028,0030) and the spacing between adjacent planes.

Enumerated Values:

RIGID

The image was acquired with a position measuring device.

FREEHAND

The image was acquired without a position measuring device.

Required if Volumetric Properties (0008,9206) is VOLUME and Volume Based Calculation Technique (0008,9207) is NONE. May be present otherwise.

Lossy Image Compression

(0028,2110)

1

Specifies whether an Image has undergone lossy compression (at a point in its lifetime).

Enumerated Values:

00

Image has NOT been subjected to lossy compression.

01

Image has been subjected to lossy compression.

Once this value has been set to 01 it shall not be reset.

See Section C.7.6.1.1.5.

Lossy Image Compression Ratio

(0028,2112)

1C

Describes the approximate lossy compression ratio(s) that have been applied to this image.

See Section C.7.6.1.1.5.2.

Required if Lossy Image Compression (0028,2110) is "01".

Lossy Image Compression Method

(0028,2114)

1C

A label for the lossy compression method(s) that have been applied to this image.

See Section C.7.6.1.1.5.1.

Required if Lossy Image Compression (0028,2110) is "01".

Presentation LUT Shape

(2050,0020)

1

Specifies an identity transformation for the Presentation LUT, such that the output of all grayscale transformations defined in the IOD containing this Module are defined to be P-Values.

Enumerated Values:

IDENTITY

output is in P-Values.

Rescale Intercept

(0028,1052)

1

The value b in relationship between stored values (SV) and the output units.

Output units = m*SV + b.

Enumerated Values:

0

Rescale Slope

(0028,1053)

1

m in the equation specified by Rescale Intercept (0028,1052).

Enumerated Values:

1

Source Image Sequence

(0008,2112)

1C

A Sequence that identifies the set of Image SOP Class/Instance pairs of the Images that were used to derive this Image.

One or more Items shall be included in this Sequence.

See Section C.12.4.1.2 for further explanation.

Required if Image Type (0008,0008) Value 1 is DERIVED.

>Include Table 10-3 “Image SOP Instance Reference Macro Attributes”

>Purpose of Reference Code Sequence

(0040,A170)

1

Describes the purpose for which the reference is made.

Only a single Item shall be included in this Sequence.

>>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 7202 “Source Image Purposes of Reference”.

Referenced Image Sequence

(0008,1140)

3

A Sequence that references other images significantly related to this image. (e.g., an image containing spatially related frames)

One or more Items are permitted in this Sequence.

>Include Table 10-3 “Image SOP Instance Reference Macro Attributes”

>Purpose of Reference Code Sequence

(0040,A170)

1

Describes the purpose for which the reference is made.

Only a single Item shall be included in this Sequence.

>>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 7201 “Referenced Image Purposes of Reference”.

Referenced Raw Data Sequence

(0008,9121)

3

A Sequence that identifies the set of Raw Data SOP Class/Instance pairs of the raw data that were used to derive this Image.

One or more Items are permitted in this Sequence.

>Include Table C.17-3 “Hierarchical SOP Instance Reference Macro Attributes”

Referenced Instance Sequence

(0008,114A)

1C

A Sequence that provides reference to a set of non-image SOP Class/Instance pairs significantly related to this Image, including waveforms that may or may not be temporally synchronized with this image.

One or more Items shall be included in this Sequence.

Required if waveforms are acquired in conjunction with image acquisition. May be present otherwise.

>Include Table 10-11 “SOP Instance Reference Macro Attributes”

>Purpose of Reference Code Sequence

(0040,A170)

1

Code describing the purpose of the reference to the Instance(s).

Only a single Item shall be included in this Sequence.

>>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 7004 “Waveform Purposes of Reference” for referenced waveforms.

Number of Stages

(0008,2124)

1C

Number of stages in this protocol.

Required if Performed Protocol Type (0040,0261) is present with value STAGED.

Stage Number

(0008,2122)

1C

A number that identifies the Stage. Stage Number starts at one.

Required if Performed Protocol Type (0040,0261) is present with value STAGED.

Stage Code Sequence

(0040,000A)

1C

Sequence describing the performed Ultrasound Protocol Stage.

Only a single Item shall be included in this Sequence.

Required if Performed Protocol Type (0040,0261) is present with value STAGED.

>Include Table 8.8-1 “Code Sequence Macro Attributes”

BCID 12002 “Ultrasound Protocol Stage Types”.

Include Table 10-24 “Mandatory View and Slice Progression Direction Macro Attributes”

See Section C.8.5.6.1.19 for CIDs.

Event Timer Sequence

(0008,2133)

3

Sequence of time intervals of significance to this image. Each Item describes one time interval either beginning or ending at Acquisition DateTime (0008,002A).

One or more Items are permitted in this Sequence.

>Event Time Offset

(0008,2134)

1

Signed value of the time between Acquisition DateTime (0008,002A) and the event, in milliseconds. Positive values indicate the event occurs after Acquisition DateTime (0008,002A).

>Event Code Sequence

(0008,2135)

1

Type of event.

Only a single Item shall be included in this Sequence.

>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 12031 “Protocol Interval Events”.

>Event Timer Name(s)

(0008,2132)

3

Name that identifies the event timer. May be used in addition to Event Time Code Sequence to offer site-specific user-readable event time names.

Only a single value shall be included.

Include Table 10-5 “General Anatomy Mandatory Macro Attributes”

No Context IDs are specified.

Burned In Annotation

(0028,0301)

1

Indicates whether or not image contains sufficient burned in annotation to identify the patient and date the image was acquired.

Enumerated Values:

NO

Recognizable Visual Features

(0028,0302)

3

Indicates whether or not the image contains sufficiently recognizable visual features to allow the image or a reconstruction from a set of images to identify the patient.

Enumerated Values:

YES

NO

If this Attribute is absent, then the image may or may not contain recognizable visual features.

Icon Image Sequence

(0088,0200)

3

This icon image is representative of the image.

Only a single Item is permitted in this Sequence.

>Include Table C.7-11b “Image Pixel Macro Attributes”

See Section C.7.6.1.1.6 for further explanation.

Transducer Data

(0018,5010)

3

Manufacturer defined code or description

Transducer Scan Pattern Code Sequence

(0018,9809)

1

The scan pattern the transducer is capable of.

Only a single Item shall be included in this Sequence.

See Section C.8.24.3.4 for further explanation.

>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 12032 “Transducer Scan Pattern”.

Transducer Geometry Code Sequence

(0018,980D)

1

Geometric structure of the transducer.

Only a single Item shall be included in this Sequence.

See Section C.8.24.3.4 for further explanation.

>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 12033 “Ultrasound Transducer Geometry”.

Transducer Beam Steering Code Sequence

(0018,980E)

1

Technique used by the transducer for beam steering.

One or more Items shall be included in this Sequence.

If more than one Item is present, the order is significant from plane-forming technique to volume-forming technique.

See Section C.8.24.3.4 for further explanation.

>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 12034 “Ultrasound Transducer Beam Steering”.

Transducer Application Code Sequence

(0018,980F)

1

The primary clinical application of the transducer.

Only a single Item shall be included in this Sequence.

See Section C.8.24.3.4 for further explanation.

>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 12035 “Ultrasound Transducer Application”.

Processing Function

(0018,5020)

3

Manufacturer defined description of processing of echo information. Data may include code or description of gain (initial, overall, TGC, dynamic range, etc.), pre-processing, post-processing, Doppler processing parameters, e.g., cutoff filters, etc., as used in generating a given image.

Mechanical Index

(0018,5022)

1

See Section C.8.5.6.1.8 for Description.

Bone Thermal Index

(0018,5024)

1

See Section C.8.5.6.1.8 for Description.

Cranial Thermal Index

(0018,5026)

1

See Section C.8.5.6.1.8 for Description.

Soft Tissue Thermal Index

(0018,5027)

1

See Section C.8.5.6.1.8 for Description.

Depth(s) of Focus

(0018,9801)

1

The depth or depths from the transducer face, of the manufacturer defined beam focus points used for the image, in mm.

Depth of Scan Field

(0018,5050)

1

The depth, in mm, from the transducer face to the deepest point included in the image- the field of view.


C.8.24.3.1 Pixel Representation

Pixel Representation (0028,0103) is specified to be Type 1 with the constraint that VR for all the pixel data will always be unsigned (US) and not signed (SS).

Enumerated Values:

0000H

unsigned integer

Note

The real-world values that are inherently signed (e.g., Flow Velocity, Tissue Velocity, Variance) are represented as unsigned, unitless pixel values and may be mapped to signed real-world quantities via the Real World Value Mapping Macro.

DICOM PS3.3 2019d - Information Object Definitions