C.8.17.9 Ophthalmic Tomography Parameters Module
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#### C.8.17.9 Ophthalmic Tomography Parameters Module

Table C.8.17.9-1 describes the parameters and characteristics of the acquisition device related to an Ophthalmic Tomography image acquisition.

Table C.8.17.9-1. Ophthalmic Tomography Parameters Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Acquisition Device Type Code Sequence | (0022,0015) | 1 | Describes the type of acquisition device. Only a single Item shall be included in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes” | Baseline CID 4210 “Ophthalmic Tomography Acquisition Device”.
Light Path Filter Type Stack Code Sequence | (0022,0017) | 2 | Filters used in the light source path. Zero or more Items shall be included in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes” | Baseline CID 4204 “Ophthalmic Filter”.
>Light Path Filter Pass-Through Wavelength | (0022,0001) | 3 | Nominal pass-through wavelength of light path filter in nm
>Light Path Filter Pass Band | (0022,0002) | 3 | Pass band of light path filter in nm. This Attribute has two Values. The first is the shorter and the second the longer wavelength relative to the peak. The values are for the - 3dB nominal (1/2 of peak) pass through intensity. One of the two Values may be zero length, in which case it is a cutoff filter.
Detector Type | (0018,7004) | 1 | Type of detector used for creating this image. Defined Terms: CCD Charge Coupled Device CMOS Complementary Metal Oxide Semiconductor PHOTO Photodetector INT Interferometer
Illumination Wave Length | (0022,0055) | 1C | Wavelength of the illuminator in nm. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.
Illumination Power | (0022,0056) | 1C | Power of the illuminator in microwatts at corneal plane. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.
Illumination Bandwidth | (0022,0057) | 1C | Bandwidth of the illuminator in nm. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.
Depth Spatial Resolution | (0022,0035) | 1C | The inherent limiting resolution in microns for depth of the acquisition equipment for high contrast objects for the data gathering and reconstruction technique chosen. If variable, the value at the center of the scanning volume. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.
Maximum Depth Distortion | (0022,0036) | 1C | Maximum distortion in depth direction in % of Depth Spatial Resolution. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.
Along-scan Spatial Resolution | (0022,0037) | 1C | The inherent limiting resolution in microns of the acquisition equipment in the direction of a row. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.
Maximum Along-scan Distortion | (0022,0038) | 1C | Maximum distortion in along-scan direction in % of Along-scan Spatial Resolution. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.
Across-scan Spatial Resolution | (0022,0048) | 1C | The inherent limiting resolution in microns of the acquisition equipment perpendicular to the slice. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.
Maximum Across-scan Distortion | (0022,0049) | 1C | Maximum distortion in across-scan direction in % of cross-scan Spatial Resolution. Required if Acquisition Device Type Code Sequence (0022,0015) contains an item with the value (A-00FBE, SRT, "Optical Coherence Tomography Scanner"). May be present otherwise.

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