# DICOM Standard Browser

Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 18 April 2024. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

## Image Index Attribute

Tag (0054,1330) Required (1) ImageIndex 1 Unsigned Short (US) 1322355

An index identifying the position of this image within a PET Series. See Section C.8.9.4.1.9 for explanation.

## Section C.8.9.4.1.9

###### C.8.9.4.1.9 Image Index

Image Index (0054,1330) is an index identifying the position of this image within a PET Series.

### Note

The scheme for encoding Image Index (0054,1330) is as follows. Images within a PET Series can be viewed as a multi-dimensional array whose possible dimensions include R-R Intervals, Time Slots, Time Slices, and Slices. The dimensions of the array are defined by Series Type (0054,1000) Value 1. Each dimension of the array has an index that identifies the position of this image in the array. The indices are: R-R Interval Index, Time Slot Index, Time Slice Index, Slice Index. The indices are calculated as follows:

Index

Range of Index

Order of Images along that Dimension

R-R Interval Index

1 to Number of R-R Intervals (0054,0061)

Increasing Low R-R Value (0018,1081).

Time Slot Index

1 to Number of Time Slots (0054,0071)

Increasing Trigger Time (0018,1060).

Time Slice Index

1 to Number of Time Slices (0054,0101)

Increasing Frame Reference Time (0054,1300).

Slice Index

1 to Number of Slices (0054,0081)

If Series Type (0054,1000) Value 2 is IMAGE: Order is in increasing position along the normal, where the normal is determined by the cross product of the direction cosines of the row and column of the image. See Image Orientation (0020,0037) in the Image Plane Module.

If Series Type (0054,1000) Value 2 is REPROJECTION: Order is in increasing or decreasing angle of the normal, where the normal is determined by the cross product of the direction cosines of the row and column of the image. See Image Orientation (0020,0037) in the Image Plane Module. (Note that reprojection images rotate about only a single axis as described in Section C.8.9.1.1.1. Therefore, all normals are co-planar and make a single angle with respect to each other.)

Using these index values the position of this image within the multi-dimensional array (Image Index (0054,1330)) is calculated as follows:

Series Type (0054,1000), Value 1

Dimensions of Array (Last dimension is most rapidly changing)

Encoding of Image Index (0054,1330)

STATIC

Slice

Slice Index

WHOLE BODY

Slice

Slice Index

DYNAMIC

Time Slice \Slice

((Time Slice Index - 1) * (Number of Slices (0054,0081))) + Slice Index

GATED

R-R Interval \Time Slot \Slice

((R-R Interval Index - 1) * (Number of Time Slots (0054,0071)) * (Number of Slices (0054,0081))) + ((Time Slot Index - 1) * (Number of Slices (0054,0081))) + Slice Index