C.8.27.2 Intravascular OCT Image Module
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#### 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
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 | The scan time in seconds used to create all frames of an Intravascular 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.
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 for further explanation. May be multi-valued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Method (0028,2114). ### Note For example, a compression ratio of 30:1 would be described in this Attribute with a single value of 30. For historical reasons, the lossy compression ratio may also be described in Derivation Description (0008,2111). 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 for further explanation. May be multi-valued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Ratio (0028,2112). 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 | 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) | 1 | 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: NO
Referenced Instance Sequence | (0008,114A) | 3 | 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 are permitted in this sequence.
>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 SOP Instances. 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 Frame Rate | (0008,2144) | 3 | Recommended rate at which the frames of an Intravascular OCT image 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.
Referenced Color Palette Instance UID | (0028,0304) | 1C | The identifier of a color palette (i.e., an instance of the Color Palette Storage SOP Class "1.2.840.10008.5.1.4.39.1") that may be used during rendering. See PS3.4 Color Palette Storage 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.

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