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DICOM PS3.3 2020a - Information Object Definitions​

Page 681​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Presentation LUT​

(2050,0020)​

1C​

Specifies an identity transformation for the Presentation LUT, such that the​

Shape​

 

 

outputofallgrayscaletransformationsdefinedintheIODcontainingthisModule​

 

 

 

are defined to be P-Values.​

 

 

 

 

Enumerated Values:​

 

 

 

 

IDENTITY​ Output is in P-Values.​

 

 

 

 

Required if Photometric Interpretation (0028,0004) is MONOCHROME2, and​

 

 

 

Bits Stored (0028,0101) is greater than 1.​

 

 

 

 

Note​

 

 

 

 

If the VOI LUT Module is required by the IOD but no VOI LUT​

 

 

 

 

Sequence (0028,3010) or Window Center (0028,1050) is present,​

 

 

 

then the VOI LUT stage is an identity transformation.​

 

Illumination​

(2010,015E)​

3​

Luminanceofahypotheticalviewingdeviceilluminatingapieceofmonochrome​

 

 

 

transmissivefilm,orforthecaseofreflectivemedia,luminanceobtainablefrom​

 

 

 

diffuse reflection of the illumination present. Expressed as L0, in candelas per​

 

 

 

square meter (cd/m2).​

 

 

 

 

Note​

 

 

 

 

May be used together with Reflected Ambient Light (2010,0160) to​

 

 

 

recover Optical Density information from P-Values. See​

 

 

 

 

Section C.8.6.3.1.​

 

Reflected Ambient​

(2010,0160)​

3​

For scanned monochrome transmissive film viewed on a hypothetical viewing​

Light​

 

 

device, the luminance contribution due to reflected ambient light. Expressed​

 

 

 

as La, in candelas per square meter (cd/m2).​

 

 

 

 

Note​

 

 

 

 

MaybeusedtogetherwithIllumination(2010,015E)torecoverOptical​

 

 

 

Density information from P-Values. See Section C.8.6.3.1.​

 

Rescale Intercept​

(0028,1052)​

1C​

The value b in the relationship between stored values (SV) in Pixel Data​

 

 

 

(7FE0,0010) and the output units specified in Rescale Type (0028,1054).​

 

 

 

Output units = m*SV + b.​

 

 

 

 

Required if Photometric Interpretation (0028,0004) is MONOCHROME2, and​

 

 

 

Bits Stored (0028,0101) is greater than 1.​

 

 

 

 

Note​

 

 

 

 

This specifies an identity Modality LUT transformation.​

 

Rescale Slope​

(0028,1053)​

1C​

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

 

Required if Photometric Interpretation (0028,0004) is MONOCHROME2, and​

Bits Stored (0028,0101) is greater than 1.​

Note​

This specifies an identity Modality LUT transformation.​

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Page 682​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Rescale Type​

(0028,1054)​

1C​

Specifies the output units of Rescale Slope (0028,1053) and Rescale Intercept​

 

 

 

(0028,1052).​

 

 

 

Defined Terms:​

 

 

 

US​Unspecified​

 

 

 

Required if Photometric Interpretation (0028,0004) is MONOCHROME2, and​

 

 

 

Bits Stored (0028,0101) is greater than 1.​

 

 

 

Note​

 

 

 

This specifies an identity Modality LUT transformation.​

Frame Increment​

(0028,0009)​

1C​

Contains the Data Element Tag of the Attribute that is used as the frame​

Pointer​

 

 

increment in Multi-frame pixel data. See Section C.7.6.6.1.2 for further​

 

 

 

explanation.​

 

 

 

ShallbepresentifNumberofFramesisgreaterthan1,overriding(specializing)​

 

 

 

the Type 1 requirement on this Attribute in the Multi-frame Module.​

NominalScannedPixel​ (0018,2010)​

1C​

Physical distance on the media being digitized or scanned between the center​

Spacing​

 

 

of each pixel, specified by a numeric pair - adjacent row spacing (delimiter)​

 

 

 

adjacent column spacing in mm. See Section 10.7.1.3 for further explanation​

 

 

 

of the value order.​

 

 

 

Required if Conversion Type (0008,0064) is DF (Digitized Film). May also be​

 

 

 

present if Conversion Type (0008,0064) is SD (Scanned Document) or SI​

 

 

 

(Scanned Image).​

 

 

 

Shall be consistent with Pixel Aspect Ratio (0028,0034), if present.​

Include Table 10-10 “Basic Pixel Spacing Calibration​

Macro Attributes”​

 

 

 

Digitizing Device​

(0018,2020)​

3​

Enumerated Values:​

Transport Direction​

 

 

ROW​

 

 

 

 

 

 

COLUMN​

Rotation of Scanned​

(0018,2030)​

3​

Angleoftheedgeofthefilmrelativetothetransportdirectionindegreesgreater​

Film​

 

 

than or equal to -45 and less than or equal to +45.​

C.8.6.3.1 Scanned Film, Optical Density and P-Values​

Illumination(2010,015E)andReflectedAmbientLight(2010,0160)maybeusedtorecoverOpticalDensityinformationfromP-Values.​

MonochromemediathatisbeingdigitizedisoftenmeasuredinOpticalDensityvalues.ThesevaluesneedtobeconvertedtoP-Values​ for storage and display. The P-Values used in an image correspond to the perception of a human observer viewing the film on a hy-​ pothetical viewing device (such as a light box), using the specified values of Illumination (2010,015E) and Reflected Ambient Light​ (2010,0160).​

The Grayscale Standard Display Function defined in PS3.14 is used to convert Luminance to P-Values. In the case of scanned film,​ the Luminance is derived from Optical Density using the specified values of Illumination (2010,015E) and Reflected Ambient Light​ (2010,0160). An example of this derivation, as well as typical "default" values for these parameters, is specified in PS3.14.​

C.8.6.4 SC Multi-frame Vector Module​

Table C.8-25c contains IOD Attributes that may be the target of the Frame Increment Pointer (0028,0009) for SC Multi-frame images.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 683​

Table C.8-25c. SC Multi-frame Vector Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Frame Time Vector​

(0018,1065)​

1C​

An array that contains the real time increments (in msec) between frames for​

 

 

 

a Multi-frame image.​

 

 

 

See Section C.7.6.5.1.2 for further explanation.​

 

 

 

Required if Frame Increment Pointer (0028,0009) points to Frame Time Vector​

 

 

 

(0018,1065).​

 

 

 

Note​

 

 

 

Frame Time Vector arrays may not be properly encoded if Explicit VR​

 

 

 

Transfer Syntax is used and the VL of this Attribute exceeds 65534​

 

 

 

bytes.​

Page Number Vector​

(0018,2001)​

1C​

An array that contains, for each of the image frames, the corresponding page​

 

 

 

numbers of the original document.​

 

 

 

RequiredifFrameIncrementPointer(0028,0009)pointstoPageNumberVector​

 

 

 

(0018,2001).​

Frame Label Vector​

(0018,2002)​

1C​

An array that contains, for each of the image frames, a descriptive label.​

 

 

 

RequiredifFrameIncrementPointer(0028,0009)pointstoFrameLabelVector​

 

 

 

(0018,2002).​

Frame Primary Angle​

(0018,2003)​

1C​

Anarraythatcontains,foreachoftheimageframes,theprimaryangleofrotation​

Vector​

 

 

about an undefined axis, in degrees. May be used for annotative purposes for​

 

 

 

"cine loops" of 3D reprojected images​

 

 

 

RequiredifFrameIncrementPointer(0028,0009)pointstoFramePrimaryAngle​

 

 

 

Vector (0018,2003).​

FrameSecondaryAngle​ (0018,2004)​

1C​

An array that contains, for each of the image frames, the secondary angle of​

Vector​

 

 

rotationaboutanundefinedaxisthatisorthogonaltothatusedforFramePrimary​

 

 

 

Angle Vector (0018,2003), in degrees. May be used for annotative purposes​

 

 

 

for "cine loops" of 3D reprojected images​

 

 

 

Required if Frame Increment Pointer (0028,0009) points to Frame Secondary​

 

 

 

Angle Vector (0018,2004).​

Slice Location Vector​

(0018,2005)​

1C​

An array that contains, for each of the image frames, the relative position of the​

 

 

 

image plane expressed in mm, as defined for Slice Location (0020,1041). See​

 

 

 

Section C.7.6.2.1.2 for further explanation.​

 

 

 

RequiredifFrameIncrementPointer(0028,0009)pointstoSliceLocationVector​

 

 

 

(0018,2005).​

Display Window Label​

(0018,2006)​

1C​

An array that contains, for each of the image frames, a label or number of the​

Vector​

 

 

displaywindowofagraphicaluserinterfacefromwhichtheframewascaptured.​

Required if Frame Increment Pointer (0028,0009) points to Display Window​

Label Vector (0018,2006).​

C.8.7 X-Ray Modules​

ThisSectiondescribesModulesusedinoneormoreX-RayIODs.TheseModulescontainAttributesthatarespecifictoX-Rayimages.​

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Page 684​ DICOM PS3.3 2020a - Information Object Definitions​

C.8.7.1 X-Ray Image Module​

Table C.8-26. X-Ray Image Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Frame Increment Pointer​

(0028,0009)​

1C​

Required if Multi-frame Image.​

 

 

 

Contains the Data Element Tag of the Attribute that is used as the​

 

 

 

Frame increment in Multi-frame image pixel data (see​

 

 

 

Section C.7.6.6).​

 

 

 

Enumerated Values:​

 

 

 

00181063H​ Frame Time (0018,1063)​

 

 

 

00181065H​ Frame Time Vector (0018,1065)​

Lossy Image Compression​

(0028,2110)​

1C​

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​

 

 

 

RequiredifLossyCompressionhasbeenperformedontheImage.​

 

 

 

May be present otherwise.​

Image Type​

(0008,0008)​

1​

Image identification characteristics.​

 

 

 

See Section C.8.7.1.1.1 for specialization.​

Pixel Intensity Relationship​

(0028,1040)​

1​

The relationship between the Pixel sample values and the X-Ray​

 

 

 

beam intensity.​

 

 

 

See Section C.8.7.1.1.2.​

Samples per Pixel​

(0028,0002)​

1​

Number of samples (color planes) in this image shall have a value​

 

 

 

of 1.​

Photometric Interpretation​

(0028,0004)​

1​

Specifies the intended interpretation of the pixel data. Only​

 

 

 

MONOCHROME2 may be used.​

Bits Allocated​

(0028,0100)​

1​

Number of bits allocated for each pixel sample.​

 

 

 

See Section C.8.7.1.1.6.​

Bits Stored​

(0028,0101)​

1​

Number of bits stored for each pixel sample.​

 

 

 

See Section C.8.7.1.1.7.​

High Bit​

(0028,0102)​

1​

Most significant bit for pixel sample data.​

 

 

 

See Section C.8.7.1.1.8.​

Pixel Representation​

(0028,0103)​

1​

Data representation of the pixel samples.​

 

 

 

Shall have the value:​

 

 

 

0000H = Unsigned Integer.​

Scan Options​

(0018,0022)​

3​

Parameters of scanning sequence.​

 

 

 

See Section C.8.7.1.1.4.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 685​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Include Table 10-7 “General Anatomy Optional Macro Attributes”​No CID for the Anatomic Region Sequence is defined.​

R Wave Pointer​

(0028,6040)​

3​

Marks the location(s) of the R Wave in the cardiac cycles by​

 

 

 

referencing frame numbers; frame numbers begin with 1.​

Referenced Image​

(0008,1140)​

1C​

Other images significantly related to this image. Shall be present​

Sequence​

 

 

if Image Type (0008,0008) Value 3 is BIPLANE A or BIPLANE B.​

 

 

 

May be present otherwise.​

 

 

 

 

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

 

 

 

See Section C.8.7.1.1.13.​

 

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

 

 

Attributes”​

 

 

 

 

>Purpose of Reference​

(0040,A170)​

3​

Describes the purpose for which the reference is made.​

Code Sequence​

 

 

Only a single Item is permitted in this Sequence.​

 

 

 

 

 

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

DCID 7201 “Referenced Image Purposes of Reference”.​

Derivation Description​

(0008,2111)​

3​

A text description of how this image was derived.​

 

 

 

 

See Section C.8.7.1.1.5 for further explanation.​

 

Acquisition Device​

(0018,1400)​

3​

Indicates any visual processing performed on the images prior to​

Processing Description​

 

 

exchange.​

 

 

 

 

See Section C.8.7.1.1.3.​

 

Frame Label Vector​

(0018,2002)​

3​

A multi-valued Attribute that contains a descriptive label for each​

 

 

 

oftheimageframes.Thenumberofvaluesshallequalthenumber​

 

 

 

of frames.​

 

Frame Dimension Pointer​

(0028,000A)​

3​

Contains the Data Element Tags of one or more Attributes that​

 

 

 

vary or increment for the frames of a multi-frame image. See​

 

 

 

Section C.8.7.1.1.12.​

 

 

 

 

Shall not be present if it would contain only one value and that​

 

 

 

value would be Frame Time (0018,1063) or Frame Time Vector​

 

 

 

(0018,1065).​

 

Calibration Image​

(0050,0004)​

3​

Indicates whether a reference object (phantom) of known size is​

 

 

 

present in the image and was used for calibration.​

 

Enumerated Values:​

YES​

NO​

DeviceisidentifiedusingtheDeviceModule.SeeSectionC.7.6.12.​

C.8.7.1.1 X-Ray Image Attribute Descriptions​

C.8.7.1.1.1 Image Type​

The Image Type Attribute identifies important image characteristics in a multiple valued Data Element. For X-Ray, Image Type is​ specialized as follows:​

•​Value 1 shall identify the Pixel Data Characteristics in accordance with Section C.7.6.1.1.2​

Enumerated Values:​

ORIGINAL​

DERIVED​

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