A.52.4.3 Ophthalmic Tomography Image Functional Group Macros

A.52.4.3 Ophthalmic Tomography Image Functional Group Macros (Current)
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Table A.52.4.3-1 specifies the use of the Functional Group Macros used in the Multi-frame Functional Groups Module for the Ophthalmic Tomography Image IOD.

Table A.52.4.3-1. Ophthalmic Tomography Image Functional Group Macros

Functional Group Macro	Section	Usage
Pixel Measures	C.7.6.16.2.1	M
Frame Content	C.7.6.16.2.2	M - May not be used as a Shared Functional Group.
Plane Position (Patient)	C.7.6.16.2.3	C - Required if no Ophthalmic Photography Reference Image is available or if Ophthalmic Volumetric Properties Flag (0022,1622) is YES; May be present otherwise
Plane Orientation (Patient)	C.7.6.16.2.4	C - Required if no Ophthalmic Photography Reference Image is available or if Ophthalmic Volumetric Properties Flag (0022,1622) is YES; May be present otherwise
Referenced Image	C.7.6.16.2.5	C - Required if Ophthalmic Photography Reference Image is available.
Derivation Image	C.7.6.16.2.6	C - Required if the image or frame has been derived from another SOP Instance.
Frame Anatomy	C.7.6.16.2.8	M
Cardiac Synchronization	C.7.6.16.2.7	C - Required if Cardiac Synchronization Technique (0018,9037) equals other than NONE. May be present otherwise.
Frame VOI LUT With LUT	C.7.6.16.2.10b	U
Contrast/Bolus Usage	C.7.6.16.2.12	C - Required if Contrast/Bolus Agent Sequence (0018,0012) is used. May not be used as a Shared Functional Group
Ophthalmic Frame Location	C.8.17.10.1	U

A.52.4.3.1 Ophthalmic Tomography Image Functional Group Macro Constraints

The Patient-based Coordinate System of the Plane Position (Patient) and Plane Orientation (Patient) Functional Groups presumes an orthogonal Cartesian right-handed system representing real-world positions and orientations in the patient. The Pixel Measures Functional Group presumes consistent column and row spacing across an image frame. However, the nature of the Ophthalmic Tomography modality and the anatomic structure of the eye as imaged introduce deformations in the OPT images, such that the position and orientation at the first (top left) pixel of a frame cannot be used to accurately compute the position of other pixels of the frame. Therefore, for the Ophthalmic Tomography Image IOD, the Attribute Values of those Functional Groups are nominal values.

Note

The deformed Patient-based Coordinate System used in Ophthalmic Tomography might treat the curved retinal surface as if it were a flat coronal plane.

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