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Page 986​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Burned In Annotation​

(0028,0301)​

1C​

Indicates whether or not the image contains sufficient burned in​

 

 

 

annotation to identify the patient and date the image was acquired.​

 

 

 

Enumerated Values:​

 

 

 

NO​

 

 

 

This means that images that contain this Module shall not contain​

 

 

 

such burned in annotations.​

 

 

 

Required if SOP Class UID is not "1.2.840.10008.5.1.4.1.1.2.2"​

 

 

 

(Legacy Converted), may be present otherwise.​

Recognizable Visual​

(0028,0302)​

3​

Indicateswhetherornottheimagecontainssufficientlyrecognizable​

Features​

 

 

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.​

Lossy Image​

(0028,2110)​

1C​

Specifies whether an Image has undergone lossy compression (at​

Compression​

 

 

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.​

 

 

 

Required if SOP Class UID is not "1.2.840.10008.5.1.4.1.1.2.2"​

 

 

 

(Legacy Converted). May be present otherwise.​

Lossy Image​

(0028,2112)​

1C​

Describes the approximate lossy compression ratio(s) that have​

Compression Ratio​

 

 

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​

(0028,2114)​

1C​

A label for the lossy compression method(s) that have been applied​

Compression Method​

 

 

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.​

Icon Image Sequence​

(0088,0200)​

3​

This icon image is representative of the Image.​

 

 

 

Only a single Item is permitted in this Sequence.​

- Standard -​

 

DICOM PS3.3 2020a

- Information Object Definitions​

Page 987​

Attribute Name​

Tag​

Type​

Attribute Description​

 

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

 

See Section C.7.6.1.1.6.​

 

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.​

IncludeTable10-27“RTEquipmentCorrelationMacroAttributes​

Description”​

C.8.15.2.1 CT Image Description Attribute Description​

C.8.15.2.1.1 Image Type and Frame Type​

In addition to the requirements specified in Section C.8.16.1 Image Type and Frame Type, the following additional requirements and​ Defined Terms are specified.​

These requirements and Defined Terms are also applicable to Frame Type (0008,9007).​

C.8.15.2.1.1.1 Pixel Data Characteristics​

Value 1 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.1. No additional requirements or​ Defined Terms.​

C.8.15.2.1.1.2 Patient Examination Characteristics​

Value 2 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.2. No additional requirements or​ Defined Terms.​

C.8.15.2.1.1.3 Image Flavor​

Table C.8-115 specifies the Defined Terms for CT additional to those defined in Section C.8.16.1.3 for Value 3 for Image Type​ (0008,0008) and Frame Type (0008,9007).​

Table C.8-115. Image Type and Frame Type Value 3 for CT​

Defined Term Name​

Defined Term Description​

ATTENUATION​

Collected for the purpose of performing attenuation corrections (e.g., PET attenuation​

 

correction)​

CARDIAC_CTA​

Images of the heart collected for the purpose of CT Coronary Angiography (CTA)​

CARDIAC_CASCORE​

Images of the heart collected for the purpose of CT Coronary Calcium Scoring​

REFERENCE​

Collected for anatomical reference for PET or SPECT​

C.8.15.2.1.1.4 Derived Pixel Contrast​

 

Table C.8-116 specifies the Defined Terms for CT additional to those defined in Section C.8.16.1.4 for Value 4 for Image Type​ (0008,0008) and Frame Type (0008,9007).​

Table C.8-116. Image Type and Frame Type Value 4 for CT​

Defined Term Name​

Defined Term Description​

FILTERED​

An image filter has been applied​

MEDIAN​

Pixel by pixel median​

- Standard -​

Page 988​

DICOM PS3.3 2020a - Information Object Definitions​

Defined Term Name​

Defined Term Description​

ENERGY_PROP_WT​

Image pixels created through proportional weighting of multiple acquisitions at​

 

distinct X-Ray energies.​

C.8.15.3 Enhanced CT Image Functional Group Macros​

The following sections contain Functional Group Macros specific to the Enhanced CT Image IOD.​

Note​

The Attribute descriptions in the Functional Group Macros are written as if they were applicable to a single frame (i.e., the​ Macro is part of the Per-frame Functional Groups Sequence). If an Attribute is applicable to all frames (i.e., the Macro is part​ of the Shared Functional Groups Sequence) the phrase "this frame" in the Attribute description shall be interpreted to mean​ " for all frames".​

C.8.15.3.1 CT Image Frame Type Macro​

Table C.8-117 specifies the Attributes of the CT Image Frame Type Functional Group Macro.​

Table C.8-117. CT Image Frame Type Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

CT Image Frame Type​

(0018,9329)​

1​

Identifies the characteristics of this frame.​

Sequence​

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

>Frame Type​

(0008,9007)​

1​

Type of Frame. A multi-valued Attribute analogous to Image​

 

 

 

Type (0008,0008).​

 

 

 

Enumerated Values and Defined Terms are the same as those​

 

 

 

for the four values of Image Type (0008,0008), except that the​

 

 

 

value MIXED is not allowed unless the SOP Class UID is​

 

 

 

"1.2.840.10008.5.1.4.1.1.2.2" (Legacy Converted). See​

 

 

 

Section C.8.16.1 and Section C.8.15.2.1.1.1.​

>Include Table C.8-131 “Common CT/MR Image Description Macro​ Attributes”​

C.8.15.3.2 CT Acquisition Type Macro​

Table C.8-118 specifies the Attributes of the CT Acquisition Type Functional Group Macro.​

Table C.8-118. CT Acquisition Type Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

CT Acquisition Type​

(0018,9301)​

1​

Contains the Attributes defining the CT acquisition mode.​

Sequence​

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

>Acquisition Type​

(0018,9302)​

1C​

Description of the method used during acquisition of this frame. See​

 

 

 

Section C.8.15.3.2.1 for Defined Terms.​

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​ present otherwise.​

- Standard -​

 

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 989​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Tube Angle​

 

(0018,9303)​

1C​

The constant angle at which the X-Ray source is located during acquisition. 0​

 

 

 

 

degrees means that the source is located at the highest point of the gantry orbit.​

 

 

 

 

Degrees increase from 0 to positive 360 in a clockwise direction as viewed when​

 

 

 

 

facing the gantry where the table enters the gantry.​

 

 

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and​

 

 

 

 

Acquisition Type (0018,9302) is CONSTANT_ANGLE.​

 

 

 

 

 

May be present otherwise if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

 

DERIVED and Acquisition Type (0018,9302) is CONSTANT_ANGLE.​

>Constant Volume​

(0018,9333)​

1C​

Identifies that the acquisition was performed by repetitively acquiring the same​

Flag​

 

 

 

volume set over a period of time.​

 

 

 

 

 

Note​

 

 

 

 

 

Acquisition Type (0018,9302) may be SEQUENCED, SPIRAL or​

 

 

 

 

STATIONARY depending on whether table movement is necessary to​

 

 

 

 

cover the volume.​

 

 

 

 

 

Enumerated Values:​

 

 

 

 

 

YES​

 

 

 

 

 

NO​

 

 

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​

 

 

 

 

present otherwise.​

 

>Fluoroscopy Flag​

(0018,9334)​

1C​

Identifies that near real-time display of a block of continuously acquired data was​

 

 

 

 

performed, which may result in a lower than usual image quality.​

 

 

 

 

 

Enumerated Values:​

 

 

 

 

 

YES​

 

 

 

 

 

NO​

 

 

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​

 

 

 

 

present otherwise.​

 

C.8.15.3.2.1 Acquisition Type​

 

 

 

Defined Terms:​

 

 

 

 

 

SEQUENCED​

identifies that the acquisition was performed by acquiring single or multi detector data while rotating the source​

 

about the gantry while the table is not moving; additional slices may be acquired by incrementing the table pos-​

 

ition and again rotating the source about the gantry while the table is not moving​

 

SPIRAL​

identifies that the acquisition was performed by acquiring data while rotating the source about the gantry while​

 

continuously moving the table​

 

CONSTANT_ANGLE​identifies that the acquisition was performed by holding the source at a constant angle and moving the table to​

 

obtain a projection image (e.g., a localizer image)​

STATIONARY​

identifies that the acquisition was performed by holding the table at a constant position and performing one or​

 

more acquisitions over time at the same location​

FREE​

identifiesthattheacquisitionwasperformedwhilerotatingthesourceaboutthegantrywhilethetablemovement​

 

is under direct control of a human operator or under the control of an analysis application (e.g., fluoroscopic​

 

image)​

C.8.15.3.3 CT Acquisition Details Macro​

Table C.8-119 specifies the Attributes of the CT Acquisition Details Functional Group Macro.​

- Standard -​

Page 990​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8-119. CT Acquisition Details Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

CTAcquisitionDetails​ (0018,9304)​

1​

Contains the Attributes defining the details of the acquisition.​

Sequence​

 

 

If Multi-energy CT Acquisition (0018,9361) is NO or is absent, only a single Item​

 

 

 

 

 

 

shall be included in this Sequence.​

 

 

 

If Multi-energy CT Acquisition (0018,9361) is YES, one or more Items shall be​

 

 

 

included in this Sequence.​

>Referenced Path​

(0018,9378)​

1C​

References the X-Ray Path Index (0018,937A) in the Multi-energy CT Path​

Index​

 

 

Sequence (0018,9379) for this exposure.​

 

 

 

Note​

 

 

 

This attribute may contain multiple values if this item describes multiple​

 

 

 

paths.​

 

 

 

Required if Multi-energy CT Acquisition (0018,9361) is YES.​

>Rotation Direction​

(0018,1140)​

1C​

Direction of rotation of the source about the gantry, as viewed while facing the​

 

 

 

gantry where the table enters the gantry.​

 

 

 

Enumerated Values:​

 

 

 

CW​clockwise​

 

 

 

CC​counter clockwise​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and​

 

 

 

Acquisition Type (0018,9302) is other than CONSTANT_ANGLE.​

 

 

 

Otherwise may be present if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

DERIVED and Acquisition Type (0018,9302) is other than CONSTANT_ANGLE.​

>Revolution Time​

(0018,9305)​

1C​

The time in seconds of a complete revolution of the source around the gantry orbit.​

 

 

 

This value is independent of the Reconstruction Angle (0018,9319) of the frame.​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and​

 

 

 

Acquisition Type (0018,9302) is other than CONSTANT_ANGLE.​

 

 

 

Otherwise may be present if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

DERIVED and Acquisition Type (0018,9302) is other than CONSTANT_ANGLE.​

>Single Collimation​

(0018,9306)​

1C​

The width of a single row of acquired data (in mm).​

Width​

 

 

Note​

 

 

 

 

 

 

Adjacentphysicaldetectorrowsmayhavebeencombinedtoformasingle​

 

 

 

effective acquisition row.​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​

 

 

 

present otherwise.​

>Total Collimation​

(0018,9307)​

1C​

The width of the total collimation (in mm) over the area of active X-Ray detection.​

Width​

 

 

Note​

 

 

 

This will be equal to the number of effective detector rows multiplied by​ single collimation width.​

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​ present otherwise.​

- Standard -​

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