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(0008,2218) Anatomic Region Sequence1Sequence
(0008,2228) Primary Anatomic Structure Sequence3Sequence
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(0022,001D) Relative Image Position Code Sequence2CSequence
(0022,1624) Ophthalmic Anatomic Reference Point X-Coordinate2CSingle
(0022,1626) Ophthalmic Anatomic Reference Point Y-Coordinate2CSingle
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Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 18 April 2024. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Ophthalmic Anatomic Reference Point Y-Coordinate Attribute

Tag(0022,1626)
TypeConditionally Required, Empty if Unknown (2C)
KeywordOphthalmicAnatomicReferencePointYCoordinate
Value Multiplicity1
Value RepresentationSingle (FL)

The vertical offset location (row) of the anatomic reference point identified by Attribute 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 must be within the range 0\0 to Rows.

Required if Ophthalmic Volumetric Properties Flag (0022,1622) is set to YES. May be present otherwise.

Section C.8.17.5.1

C.8.17.5.1 Ocular Region Imaged Module Attribute Descriptions
C.8.17.5.1.1 Ophthalmic Anatomic Reference Point Location

The Attributes Ophthalmic Anatomic Reference Point X-Coordinate (0022,1624) and Ophthalmic Anatomic Reference Point Y-Coordinate (0022,1626) 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 region conveyed in Attribute Primary Anatomic Region Sequence (0008,2228). The most common anatomic regions identified for an OCT angiography are the fovea centralis and optic nerve head.

Note

The Anatomic Region Sequence (0008,2218) is typically set to (81745001, SCT, "Eye").

Figure C.8.17.5-1 shows an Ophthalmic Tomography 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, Attribute Ophthalmic Anatomic Reference Point X-Coordinate (0022,0024) is equal to 194 and Attribute Ophthalmic Anatomic Reference Point Y-Coordinate (0022,0026) is equal to 132.

Figure C.8.17.5-1. En face Image - Ophthalmic Anatomic Reference Point Location Example


Figure C.10.5-1

Figure C.10.5-1. Sub-pixel Addressing Units in PIXEL Space