Table C.188.8.131.52-1 specifies the attributes of the Intravascular OCT Frame Content Functional Group.
Table C.184.108.40.206-1INTRAVASCULAR 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.220.127.116.11.1 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.18.104.22.168.2 for further explanation.|
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
Figure C.8.27-2 OCT Z Offset Correction Example
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.