Table C.8.17.5-1 specifies the Attributes of the Ocular Region Imaged Module, which describe the anatomy imaged in an Ophthalmic Photography or Ophthalmic Tomography Image Storage SOP Instance.
Table C.8.17.5-1. Ocular Region Imaged Module Attributes
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Laterality of object imaged (as described in Anatomic Region Sequence (0008,2218)) examined. Shall be consistent with any laterality information contained in Primary Anatomic Structure Modifier Sequence (0008,2230), if present. NoteLaterality (0020,0060) is a Series level Attribute and must be the same for all Images in the Series, hence it must be absent if Image Laterality (0020,0062) has different values for Images in the same Series. Since most Ophthalmic Photographic Image Series contain images of both eyes, the Series level Attribute will rarely be present. |
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The position of this image on the retina (as defined by a specified nomenclature; the nomenclature is implicit in the code used). Only a single Item is permitted in this Sequence. Required if Ophthalmic Volumetric Properties Flag (0022,1622) is set to YES and Ophthalmic Anatomic Reference Point X-Coordinate (0022,1624) and Ophthalmic Anatomic Reference Point Y-Coordinate (0022,1626) do not contain a value, or Ophthalmic Anatomic Reference Point Sequence (0022,1632) is not present. May be present otherwise. NoteThis Attribute is used to provide the user with a general reference point when viewing the image. If the implementation is able to identify precise anatomic locations, it will convey that information in Ophthalmic Anatomic Reference Point X-Coordinate (0022,1624) and Ophthalmic Anatomic Reference Point Y-Coordinate (0022,1626), or Ophthalmic Anatomic Reference Point Sequence (0022,1632). |
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The horizontal offset location (column) of the anatomic reference point identified by Primary Anatomic Region Sequence (0008,2228). See Section C.8.17.5.1 for further explanation. Image relative position specified with sub-pixel resolution such that the origin at the Top Left Hand Corner (TLHC) of the TLHC pixel is 0.0\0.0, the Bottom Right Hand Corner (BRHC) of the TLHC pixel is 1.0\1.0, and the BRHC of the BRHC pixel is Columns\Rows (see Figure C.10.5-1). The value shall be within the range 0 to Columns (0028,0011). Required if Ophthalmic Anatomic Reference Point Sequence (0022,1632) is not present and Ophthalmic Volumetric Properties Flag (0022,1622) is set to YES. May be present otherwise. |
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The vertical offset location (row) of the anatomic reference point identified by Primary Anatomic Region Sequence (0008,2228). See Section C.8.17.5.1 for further explanation. Image relative position specified with sub-pixel resolution such that the origin at the Top Left Hand Corner (TLHC) of the TLHC pixel is 0.0\0.0, the Bottom Right Hand Corner (BRHC) of the TLHC pixel is 1.0\1.0, and the BRHC of the BRHC pixel is Columns\Rows (see Figure C.10.5-1). The value shall be within the range 0 to Rows (0028,0010). Required if Ophthalmic Anatomic Reference Point Sequence (0022,1632) is not present and Ophthalmic Volumetric Properties Flag (0022,1622) is set to YES. May be present otherwise. |
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Locations of the anatomic reference points identified by Items in Primary Anatomic Structure Sequence (0008,2228). Required if Ophthalmic Volumetric Properties Flag (0022,1622) is set to YES and SOP Instance is a Multi-frame Image, or if Primary Anatomic Structure Sequence (0008,2228) contains multiple Items. May be present otherwise. |
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Sequence Item index of the referenced Primary Anatomic Structure. Value shall be in the range 1 to number of Items in Primary Anatomic Structure Sequence (0028,2228). |
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Type of method used to localize the anatomic structure in the image. |
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The horizontal offset location (column) of the anatomic reference point identified by Primary Anatomic Structure Sequence (0008,2228). See Section C.8.17.5.1 for further explanation. Image relative position specified with sub-pixel resolution such that the origin at the Top Left Hand Corner (TLHC) of the TLHC pixel is 0.0\0.0, the Bottom Right Hand Corner (BRHC) of the TLHC pixel is 1.0\1.0, and the BRHC of the BRHC pixel is Columns\Rows (see Figure C.10.5-1). The value shall be within the range 0.0 to Columns (0028,0011). |
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The vertical offset location (row) of the anatomic reference point identified by Primary Anatomic Structure Sequence (0008,2228). See Section C.8.17.5.1 for further explanation. Image relative position specified with sub-pixel resolution such that the origin at the Top Left Hand Corner (TLHC) of the TLHC pixel is 0.0\0.0, the Bottom Right Hand Corner (BRHC) of the TLHC pixel is 1.0\1.0, and the BRHC of the BRHC pixel is Columns\Rows (see Figure C.10.5-1). The value shall be within the range 0.0 to Rows (0028,0010). |
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The frame number offset of the anatomic reference point identified by Primary Anatomic Structure Sequence (0008,2228). Required if SOP Instance is a Multi-frame Image, and frames are parallel and equally spaced. Image relative position specified with sub-voxel resolution such that the middle position of the image plane of the first frame is 0.5 and the middle position of the image plane of the last frame is Number of Frames (0028,0008) - 0.5. The value shall be within the range 0.0 to Number of Frames (0028,0008). |
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Include Table 10-5 “General Anatomy Mandatory Macro Attributes” |
DCID 4209 “Ophthalmic Anatomic Structure Imaged” for Anatomic Region Sequence. DCID 4266 “Ophthalmic Anatomic Structure Reference Point” for Primary Anatomic Structure Sequence. In this Module, Primary Anatomic Structure Sequence (0008,2228) is specialized to be Type 1C; required if Ophthalmic Anatomic Reference Point X-Coordinate (0022,0024) and Ophthalmic Anatomic Reference Point Y-Coordinate (0022,0026) contain a value, or Ophthalmic Anatomic Reference Point Sequence (0022,1632) is present; may be present otherwise. |
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The Ophthalmic Anatomic Reference Point X-Coordinate (0022,1624), Ophthalmic Anatomic Reference Point Y-Coordinate (0022,1626) and Ophthalmic Anatomic Reference Point Frame Coordinate (0022,1623) are used when an Ophthalmic Tomography Image Storage SOP Instance contains Attributes to convey volumetric properties (such as when using the Ophthalmic Tomography image for angiography). These Attributes identify the location of the anatomic structures conveyed in Primary Anatomic Region Sequence (0008,2228). The most common anatomic structures identified for an OCT angiography are the fovea centralis and optic nerve head.
Individual coordinate values are Type 2 Attributes. If the implementation is not able to provide all three coordinates, unknown coordinates shall be conveyed as empty values. Ophthalmic Anatomic Reference Point Frame Coordinate (0022,1623) is required only for volumetric Multi-frame Images.
Note
The Anatomic Region Sequence (0008,2218) is typically set to (81745001, SCT, "Eye").
Figure C.8.17.5-1 shows an Ophthalmic Tomography En Face image displaying the fovea centralis. The image Row/Column is defined as 245 x 245 and the location of the fovea centralis is horizontal row = 194 and vertical row = 132. Therefore, Ophthalmic Anatomic Reference Point X-Coordinate (0022,0024) is equal to 194 and Ophthalmic Anatomic Reference Point Y-Coordinate (0022,0026) is equal to 132. Because the Image is two-dimensional, Ophthalmic Anatomic Reference Point Frame Coordinate (0022,1623) is not present.
