C.8.17.7 Ophthalmic Tomography Image Module

Table C.8.17.7-1 specifies the Attributes that describe an Image produced by Ophthalmic Tomography imaging modalities.

Table C.8.17.7-1OPHTHALMIC TOMOGRAPHY IMAGE MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Image Type (0008,0008) 1 Image identification characteristics. See C.7.6.1.1.2 for Enumerated Values and Defined Terms and further explanation.
Samples Per Pixel (0028,0002) 1 Number of samples (planes) in this image. See C.7.6.3.1.1 for further explanation. Value shall be 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 Ophthalmic 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 which resulted in this image.
Photometric Interpretation (0028,0004) 1 Specifies the intended interpretation of the pixel data. Enumerated Value shall be: MONOCHROME2
Pixel Representation (0028,0103) 1 Data representation of pixel samples. Enumerated Value shall be 0.
Bits Allocated (0028,0100) 1 Number of bits allocated for each pixel sample. Each sample shall have the same number of bits allocated. Bits Allocated (0028,0100) shall be 8 or 16
Bits Stored (0028,0101) 1 Number of bits stored for each pixel sample. Each sample shall have the same number of bits stored. Bits Stored (0028,0101) shall be 8, 12 or 16
High Bit (0028,0102) 1 Most significant bit for pixel sample data. Each sample shall have the same high bit. High Bit (0028,0102) shall be one less than Bits Stored
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.
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 tag has been set to 01 it shall not be reset. If this tag is empty, no information is explicitly available. See 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. Required when compression has been applied. See C.7.6.1.1.5 for further explanation. May be multivalued if successive lossy compression steps have been applied. Notes: 1. For example, a compression ratio of 30:1 would be described in this Attribute with a single value of 30. 2. For historical reasons, the lossy compression ratio should also be described in Derivation Description (0008,2111).
Lossy Image Compression Method (0028,2114) 1C A label for the lossy compression method(s) that have been applied to this image. See 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) has a value of “01”. Note: For historical reasons, the lossy compression method should 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 Value: 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.
Concatenation Frame Offset Number (0020,9228) 1 Offset of the first frame in a multi-frame image of a concatenation. Value shall be 0.
In-concatenation Number (0020,9162) 1 Identifier for one SOP Instance belonging to a concatenation. Value shall be 1.
In-concatenation Total Number (0020,9163) 1 The number of SOP Instances sharing the same Concatenation UID (0020,9161). Value Shall be 1.
Image Comments (0020,4000) 3 User-defined comments about the image

The value constraints on Concatenation Frame Offset Number (0020,9228), In-concatenation Number (0020,9162), and In-concatenation Total Number (0020,9163) have the effect of requiring the entire image to be in one concatenation.