DICOM PS3.3 2019c - Information Object Definitions

C.8.27.4 Intravascular OCT Processing Parameters Module

Table C.8.27.4-1 describes the parameters used for processing an Intravascular Optical Coherence Tomography polar data image.

Table C.8.27.4-1. Intravascular OCT Processing Parameters Module Attributes

Attribute Name

Tag

Type

Attribute Description

OCT Z Offset Applied

(0052,0026)

1

Indicates whether or not Z offset correction was applied to the OCT image frames.

Enumerated Values:

YES

NO

Refractive Index Applied

(0052,003A)

1

Indicates whether or not Refractive Index correction was applied.

Enumerated Values:

YES

NO

See Section C.8.27.4.1 for further explanation.

A-line Pixel Spacing

(0052,0014)

1

Spacing of pixels in the A-line (X-axis), in mm.

Pixel Intensity Relationship

(0028,1040)

1

The relationship between the pixel sample values and the IVOCT A-line intensity.

See Section C.8.27.4.2.

First A-line Location

(0052,0034)

1

Orientation in degrees at which the 1st A-line in the frame should be displayed. Value shall be between 0 and 360, with zero representing vertical.


C.8.27.4.1 Refractive Index Applied

For Refractive Index Applied (0052,003A) a value of YES indicates that Effective Refractive Index (0052,0004) correction has been applied to the reported A-line Pixel Spacing (0052,0014) Attribute. A value of NO indicates that Effective Refractive Index (0052,0004) correction has not been applied (i.e., A-line Pixel Spacing corresponds to the pixel spacing in air).

C.8.27.4.2 Pixel Intensity Relationship

Pixel Intensity Relationship (0028,1040) shall identify the relationship of the pixel values to the IVOCT A-line intensity.

Defined Terms:

LIN

Approximately proportional to A-line intensity.

LOG

Non-linear "Log Function"; A Pixel Intensity Relationship LUT shall be included with the image to allow it to be scaled back to its proportional A-line intensity value.

DICOM PS3.3 2019c - Information Object Definitions