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DICOM PS3.3 2020a - Information Object Definitions​

Page 1191​

2.​FOR PRESENTATION images may still be subjected to processing or further processing, if appropriate, depending on​ the application.​

3.​FOR PRESENTATION images are intended for display on a device, without (further) processing, since that device may​ not be capable of image processing. The quality of the displayed image or its suitability for any purpose is beyond the​ scope of the DICOM Standard.​

4.​IfalloftheframesofaFORPRESENTATIONimagearecreatedbyprocessingalloftheframesofaFORPROCESSING​ image, then a reference to the FOR PROCESSING SOP Instance only, without reference to specific frame numbers,​ intheSharedFunctionalGroupSequenceavoidstheneedforaframe-by-framereferenceineachPer-FrameFunctional​ Group, though there is no requirement that the order of the frames or the number of frames in the FOR PROCESSING​ and FOR PRESENTATION instances correspond.​

FOR PROCESSING images may have Z Offset correction applied to the A-line data and/or Refractive Index applied to A-line Pixel​ Spacing (0052,0014). However, due to irreversible loss of information, images that have had Polar to Rectangular scan conversion​ applied shall not be stored as FOR PROCESSING images.​

Polar Data

 

 

 

Processing for Presentation

 

Presented on

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Workstation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ORIGINAL

 

 

Z-Offset

 

 

 

 

Refractive

 

 

 

Polar to

 

 

ORIGINAL

 

 

 

 

 

 

 

 

 

 

 

 

 

FOR

 

 

 

 

 

 

Index

 

 

 

Rectangular

 

 

 

FOR

 

 

Correction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Correction

 

 

 

Conversion

 

 

PROCESSING

 

 

 

 

 

 

 

 

 

 

 

 

PRESENTATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Advanced Processing

(e.g., Longitudinal display, etc.)

DERIVED

Figure C.8.27-1. Explanation of Presentation Intent Type​

C.8.27.2 Intravascular OCT Image Module​

Table C.8.27.2-1 specifies the Attributes that describe an Image produced by Intravascular OCT imaging modalities.​

Table C.8.27.2-1. Intravascular OCT Image Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Image Type​

(0008,0008)​

1​

Image identification characteristics.​

 

 

 

See Section C.8.27.2.1 for specialization.​

Volumetric Properties​

(0008,9206)​

1​ Indication if geometric manipulations are possible with frames in the​

 

 

 

SOP Instance. See Section C.8.27.2.2.​

Pixel Presentation​

(0008,9205)​

1​ Indication of the presence or absence of color information that may​

 

 

 

be used during rendering. See Section C.8.27.2.3 for a description​

 

 

 

and Enumerated Values.​

Samples Per Pixel​

(0028,0002)​

1​ Number of samples (planes) in this image.​

 

 

 

Enumerated Values:​

 

 

 

1​

- Standard -​

Page 1192​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Acquisition DateTime​

(0008,002A)​

1​

The date and time that the acquisition of data started.​

 

 

 

Note​

 

 

 

The synchronization of this time with an external clock is​

 

 

 

specified in the synchronization Module in Acquisition Time​

 

 

 

synchronized (0018,1800).​

Acquisition Duration​

(0018,9073)​

1C​

ThescantimeinsecondsusedtocreateallframesofanIntravascular​

 

 

 

Optical Coherence Tomography image.​

 

 

 

Required if Image Type (0008,0008) Value 1 is ORIGINAL. May be​

 

 

 

present otherwise.​

Acquisition Number​

(0020,0012)​

1​

A number identifying the single continuous gathering of data over a​

 

 

 

period of time that resulted in this image.​

Photometric Interpretation​

(0028,0004)​

1​

Specifies the intended interpretation of the pixel data.​

 

 

 

Enumerated Values:​

 

 

 

MONOCHROME2​

Pixel Representation​

(0028,0103)​

1​

Data representation of pixel samples.​

 

 

 

Enumerated Values:​

 

 

 

0​

Bits Allocated​

(0028,0100)​

1​

Number of bits allocated for each pixel sample.​

 

 

 

See Section C.8.27.2.4 for specialization.​

Bits Stored​

(0028,0101)​

1​

Number of bits stored for each pixel sample.​

 

 

 

See Section C.8.27.2.4 for specialization.​

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).​

Presentation LUT Shape​

(2050,0020)​

1C​

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.​

 

Required if Presentation Intent Type (0008,0068) equals FOR​

 

PRESENTATION.​

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.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1193​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Lossy Image Compression​

(0028,2112)​

1C​

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

Ratio​

 

 

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​

(0028,2114)​

1C​

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

Method​

 

 

to this image.​

 

 

 

 

See Section C.7.6.1.1.5.1.​

 

 

 

 

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

 

 

 

Note​

 

 

 

 

For historical reasons, the lossy compression method may​

 

 

 

also be described in Derivation Description (0008,2111).​

Burned In Annotation​

(0028,0301)​

1​

Indicateswhetherornotimagecontainssufficientburnedinannotation​

 

 

 

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

 

 

 

 

Enumerated Values:​

 

 

 

 

NO​

 

Recognizable Visual​

(0028,0302)​

1​

Indicates whether or not the image contains sufficiently recognizable​

Features​

 

 

visual features to allow the image or a reconstruction from a set of​

 

 

 

images to identify the patient.​

 

 

 

 

Enumerated Values:​

 

 

 

 

NO​

 

Referenced Instance​

(0008,114A)​

3​

A Sequence that provides reference to a set of non-image SOP​

Sequence​

 

 

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 are permitted in this Sequence.​

 

>Include Table 10-11 “SOP Instance Reference Macro​

 

 

Attributes”​

 

 

 

 

>Purpose of Reference​

(0040,A170)​

1​

Code describing the purpose of the reference to the SOP Instances.​

Code Sequence​

 

 

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

 

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

Defined CID is CID 7004 “Waveform Purposes of Reference” for​

 

 

 

referenced waveforms.​

 

Image Comments​

(0020,4000)​

3​

User-defined comments about the image.​

 

Recommended Display​

(0008,2144)​

3​

RecommendedrateatwhichtheframesofanIntravascularOCTimage​

Frame Rate​

 

 

should be displayed in frames/second.​

 

Interpolation Type​

(0052,0039)​

1C​

The type of interpolation used for the Polar to Cartesian​

 

 

 

 

scan-conversion.​

 

Defined Terms:​

REPLICATE​

BILINEAR​

CUBIC​

Required if Presentation Intent Type (0008,0068) equals FOR​

PRESENTATION.​

- Standard -​

Page 1194​

DICOM PS3.3 2020a

- Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Referenced Color Palette​

(0028,0304)​

1C​

The identifier of a color palette (i.e., an instance of the Color Palette​

Instance UID​

 

 

Storage SOP Class "1.2.840.10008.5.1.4.39.1") that may be used​

 

 

 

during rendering. SeePS3.4 Color PaletteStorage Service Class and​

 

 

 

PS3.6 Well-Known Color Palettes.​

Required if Pixel Presentation (0008,9205) is COLOR_REF.​

C.8.27.2.1 Image Type and Frame Type​

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

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.​

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.​

Value 3 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.3.​

Table C.8.27.2-2 specifies the Defined Terms for IVOCT for Value 3 for Image Type (0008,0008) and Frame Type (0008,9007).​

Table C.8.27.2-2. IVOCT Image Type and Frame Type Value 3​

Defined Term Name​

Defined Term Description​

AXIAL​

An image that has an orientation that is perpendicular to the long axis of the vessel. (i.e.,​

 

cross-sectional).​

LONGITUDINAL​

An image that has an orientation that is parallel to the long axis of the vessel.​

Value 4 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.4. No additional requirements or​ Defined Terms.​

C.8.27.2.2 Volumetric Properties​

The value of Volumetric Properties (0008,9206) Attribute allows applications doing geometric manipulations to determine if the image​ is an appropriate candidate for an operation without having to know all the details of the generating application.​

Table C.8.27.2-3 specifies the Enumerated Values for Volumetric Properties (0008,9206).​

Table C.8.27.2-3. Volumetric Properties Attribute Values​

Enumerated Value Name​

Enumerated Value Description​

DISTORTED​

Frames do not represent the true geometry of the vessel.​

C.8.27.2.3 Pixel Presentation​

PixelPresentation(0008,9205)isusedtoindicatewhetheracolortintisintendedtobeappliedtotheIVOCTimage.SeeTableC.8.27.2-​ 4.​

 

Table C.8.27.2-4. Pixel Presentation Attribute Values​

Enumerated Value Name​

Enumerated Value Description​

COLOR​

Image is intended to be displayed in color using Supplemental Palette Color LUTs, but can be​

 

displayed in grayscale if current display does not support color or with a user selected LUT. See​

 

Section C.8.16.2.1.1.1.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1195​

Enumerated Value Name​

Enumerated Value Description​

 

COLOR_REF​

Image is intended to be displayed in color using an externally defined Palette Color LUTs, but can​

 

be displayed in grayscale if current display does not support color, or with a user selected LUT.​

 

I.e., the encoded pixel values are still continuous grayscale values (and not arbitrarily order indices​

 

into a lookup table).​

 

MONOCHROME​

Image is intended to be displayed in grayscale only.​

 

C.8.27.2.4 Bits Allocated, Bits Stored and Samples Per Pixel​

For IVOCT images, Bits Allocated (0028,0100), Bits Stored (0028,0101) Samples Per Pixel (0028,0002) are specified to use the fol-​ lowing values for Presentation Intent Type (0008,0068) Attribute:​

Table C.8.27.2-5. Bits Allocated/Stored​

Presentation Intent Type​

Bits Allocated / Bits Stored​

Samples Per Pixel​

FOR PRESENTATION​

8/8, 16/12 or 16/16​

1​

FOR PROCESSING​

8/8, 16/12 or 16/16​

1​

C.8.27.3 Intravascular OCT Acquisition Parameters Module​

Table C.8.27.3-1 describes the parameters used to acquire an Intravascular Optical Coherence Tomography image.​

Table C.8.27.3-1. Intravascular OCT Acquisition Parameters Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

OCT Focal Distance​

(0052,0002)​

2​

Distance from focal point to center of catheter, in mm (measured in​

 

 

 

air).​

Beam Spot Size​

(0052,0003)​

2​

The full width at half maximum (FWHM) of the point spread function​

 

 

 

(PSF) or line spread function (LSF), in µm (measured in air). Also​

 

 

 

known as Transverse Resolution.​

Effective Refractive Index​

(0052,0004)​

2C​

Index of refraction of the tissue and flush medias used during the​

 

 

 

Intravascular OCT acquisition.​

 

 

 

Required if Presentation Intent Type (0008,0068) is FOR​

 

 

 

PROCESSING. May be present otherwise.​

OCT Acquisition Domain​

(0052,0006)​

1​

The type of OCT acquisition domain.​

 

 

 

Defined Terms:​

 

 

 

TIME​

 

 

 

FREQUENCY​

 

 

 

SPECTRAL​

OCT Optical Center​

(0052,0007)​

2​

Center optical wavelength of the OCT light source, in µm.​

Wavelength​

 

 

 

Axial Resolution​

(0052,0008)​

2​

The full width at half maximum (FWHM) of the axial plane response​

 

 

 

function, in µm (measured in air)​

Ranging Depth​

(0052,0009)​

1​

Maximum detectable sample-to-reference path displacement, in mm​

 

 

 

(measured in air). This is the radius of the FOR PRESENTATION​

 

 

 

image in air.​

 

 

 

Note​

 

 

 

Ranging Depth is distinct from Penetration Depth, which is​

 

 

 

the depth to which one can obtain an OCT signal in tissue.​

A-line Rate​

(0052,0011)​

1​

The number of IVOCT A-lines acquired per second in Hz.​

- Standard -​

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