DICOM PS3.3 2019b - Information Object Definitions
C.8.22.5.6 PET Reconstruction Macro

Table C.8.22-17 specifies the Attributes of the PET Reconstruction Functional Group Macro, which describe the method used to reconstruct this image.

Table C.8.22-17. PET Reconstruction Macro Attributes

Attribute Name

Tag

Type

Attribute Description

PET Reconstruction Sequence

(0018,9749)

1

Contains the Attributes describing the reconstruction process for this frame.

Only a single Item shall be included in this Sequence.

>Reconstruction Type

(0018,9756)

1C

Description of the type of algorithm used when reconstructing the image from the data acquired during the acquisition process.

Defined Terms:

2D

3D

3D_REBINNED

Required if Frame Type (0008,9007) Value 1 equals ORIGINAL. May be present otherwise.

>Reconstruction Algorithm

(0018,9315)

1C

Description of the algorithm used when reconstructing the image from the data acquired during the acquisition process.

Defined Terms:

FILTER_BACK_PROJ

REPROJECTION

RAMLA

MLEM

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.

>Iterative Reconstruction Method

(0018,9769)

1

Iterative Reconstruction Method used.

Enumerated Values:

YES

NO

>Number of Iterations

(0018,9739)

1C

Number of iterations.

Required if Frame Type (0008,9007) Value 1 equals ORIGINAL and Iterative Reconstruction Method (0018,9769) equals YES. May be present otherwise.

>Number of Subsets

(0018,9740)

1C

Number of subsets.

Required if Frame Type (0008,9007) Value 1 equals ORIGINAL and Iterative Reconstruction Method (0018,9769) equals YES. May be present otherwise.

>Reconstruction Diameter

(0018,1100)

1C

The diameter in mm of the region from which data were used in creating the reconstruction of the image. Data may exist outside this region and portions of the patient may exist outside this region. See Section C.8.22.5.4.1.

The diameter defines a circular region that is entirely contained within the encoded Pixel Data (7FE0,0010), unless the encoded image has been cropped after reconstruction.

Note

If not cropped or padded, for square images with square pixels, both values of Pixel Spacing (0028,0030) will be equal and equal to Reconstruction Diameter (0018,1100) / Rows (0028,0010) and Reconstruction Diameter (0018,1100) / Columns (0028,0011).

Required if Frame Type (0008,9007) Value 1 equals ORIGINAL and Reconstruction Field of View (0018,9317) is not present.

Otherwise may be present if Frame Type (0008,9007) Value 1 equals DERIVED and Reconstruction Field of View (0018,9317) is not present.

>Reconstruction Field of View

(0018,9317)

1C

The field of view width followed by height as used for reconstruction in mm.

Note

If not cropped or padded, for both Pixel Spacing (0028,0030) and Reconstruction Pixel Spacing (0018,9322):

  • The first value (adjacent row spacing) will be equal to the second value of Reconstruction Field of View (0018,9317) / Rows (0028,0010).

  • The second value (adjacent column spacing) will be equal to the first value of Reconstruction Field of View (0018,9317) / Columns (0028,0011).

Required if Image Type (0008,9007) Value 1 equals ORIGINAL and Reconstruction Diameter (0018,1100) is not present.

Otherwise may be present if Frame Type (0008,9007) Value 1 equals DERIVED and Reconstruction Diameter (0018,1100) is not present.


DICOM PS3.3 2019b - Information Object Definitions