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DICOM PS3.3 2020a - Information Object Definitions |
C.8.25.14.1.1 Ophthalmic Axial Measurements Macro Attribute Descriptions
C.8.25.14.1.1.1 Lens Status Code Sequence
LensStatusCodeSequence(0022,1024)referstoeitherthenaturallensoftheeye(phakic),orvarioustypesoflensimplantsinserted in cataract surgery, or lack of a lens in the eye (aphakic).
C.8.25.14.1.1.2 Vitreous Status Code Sequence
Vitreous Status Code Sequence (0022,1025) refers to either the natural status of the vitreous cavity (vitreous only) or to various possible states after vitreous surgery.
C.8.25.14.1.1.3 Ophthalmic Axial Length
IfOphthalmicAxialMeasurementsDeviceType(0022,1009)isULTRASOUND,theOphthalmicAxialLength(0022,1019)measurement is taken from the anterior vertex of the cornea to the anterior surface of the retina (internal limiting membrane).
If Ophthalmic Axial Measurements Device Type (0022,1009) is OPTICAL, the Ophthalmic Axial Length (0022,1019) measurement is taken from the anterior vertex of the cornea to the level of the photoreceptors in the retina and compensated to adjust for the thickness of the retina to mimic the ultrasound technique.
This difference is an inherent property of the measurement method. Since optical devices measure to retinal pigment epithelium and ultrasound devices measure to internal limiting membrane, the difference must be subtracted to obtain comparable results for use in intraocular lens calculation formulas. The difference is the thickness of the retina, which has been determined empirically and varies with the axial length of the eye.
The intent is to measure along the patient's visual axis.
C.8.25.14.1.1.4 Ophthalmic Axial Length Measurements Segment Name Code Sequence
When the acquisition device type is ultrasound, the Ophthalmic Axial Length (0022,1019) may represent distance calculated using a single time value and an average presumed velocity for the entire eye. Alternatively it may represent the sum of multiple segmental axial length measurements with each distance value calculated using a different time value and a presumed velocity specific to that segment of the eye.
Whentheacquisitiondevicetypeisoptical,thewholelengthcanbemeasuredinsteadofmeasuringandsummingupdifferentsegments of the eye. Nevertheless, optical axial measurement devices can also measure segments of the eye independently(e.g., the Anterior Chamber depth).
Each segment of the eye that is measured shall be identified by the Ophthalmic Axial Length Measurements Segment Name Code Sequence (0022,1101).
C.8.25.14.1.1.5 Observer Type
ForAttributeObserverType(0040,A084),Ultrasoundaxiallengthmeasurementdevicestakemanymeasurementsinrapidsequence. The machine can be set to select a good quality measurement automatically, or it can be set so that the user presses a footswitch when he/she sees a quality measurement based on the graphical display.
C.8.25.14.1.1.6 Referenced Ophthalmic Axial Length Measurement QC Image Sequence
TheAttributeReferencedOphthalmicAxialLengthMeasurementQCImageSequence(0022,1330)referencesaqualitycontrolimage that is a secondary capture of the presentation of a one dimensional waveform produced when performing ophthalmic axial measure- ments. It is acquired by the modality creating the ophthalmic axial measurements. The purpose of these images is to judge the quality of an axial length measurement for use in calculating the power of intraocular lens to place in a patient's eye in cataract surgery. The image is used for quality control and not for diagnostic purposes. See PS3.17.
The SOP Instance for the quality control image will meet the following requirements:
•Frame Increment Pointer (0028,0009) is set to 00182002 = sequencing by Frame Label Vector (0018,2002).
Note
The frame number is the recommended value for the label.
>IncludeTableC.8.25.14-2“OphthalmicAxialMeasurementsMacroAttributes”
