DICOM PS3.3 2021a - Information Object Definitions
C.8.27.6.3 Intravascular OCT Frame Content Macro

Table C.8.27.6.3-1 specifies the Attributes of the Intravascular OCT Frame Content Functional Group.

Table C.8.27.6.3-1. Intravascular OCT Frame Content Macro Attributes

Attribute Name

Tag

Type

Attribute Description

Intravascular OCT Frame Content Sequence

(0052,0029)

1

A Sequence that describes a general description of this image or frame.

Only a single Item shall be included in this Sequence.

>OCT Z Offset Correction

(0052,0030)

1

The amount to shift the frame along the axial direction, in pixels, to correct for interferometer path-length mismatch.

See Section C.8.27.6.3.1 for further explanation.

>Seam Line Index

(0052,0036)

1

The A-line number (zero index) that coincides with the seam line as indicated with the First A-line Location (0052,0034) Attribute.

>Number of Padded A-lines

(0052,0038)

1C

The number of padded A-lines contained in the FOR PROCESSING image frame. Required if the FOR PROCESSING image contains padded A-lines.

See Section C.8.27.6.3.2 for further explanation.


C.8.27.6.3.1 OCT Z Offset Correction

OCT Z Offset Correction (0052,0030) specifies the number of pixels to shift the A-lines of the frame to correct for the path length difference between the OCT Sample arm and Reference arm (in air). A positive value of Z Offset correction means pixels are shifted further away from the catheter optics. A negative value of Z Offset correction means pixels are shifted closer to the catheter optics. See Figure C.8.27-2

OCT Z Offset Correction Example

Figure C.8.27-2. OCT Z Offset Correction Example


C.8.27.6.3.2 A-line Padding

Padded A-lines shall not be used in FOR PRESENTATION frames. Padded A-lines shall only be encoded in the high order rows of the FOR PROCESSING frame and shall be contiguous. Padded A-lines may contain arbitrary pixel values.

DICOM PS3.3 2021a - Information Object Definitions