DICOM PS3.3 2020a - Information Object Definitions

C.11.24 Volume Cropping Module (Current)
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### C.11.24 Volume Cropping Module

Table C.11.24-1 contains the Attributes of the Volume Cropping Module. This Module limits the spatial extent of inputs in Volumetric Presentation State Input Sequence (0070,1201) that are used.

Table C.11.24-1. Volume Cropping Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Volume Cropping Sequence | (0070,1301) | 1 | Regions cropped from volumetric presentation inputs. One or more Items shall be included in this Sequence.
>Cropping Specification Number | (0070,1309) | 1 | Identification number of the cropping specification, as an ordinal number starting from 1 and monotonically increasing by 1 within the Volumetric Presentation State Instance.
>Volume Cropping Method | (0070,1302) | 1 | Method of volume cropping applied. Enumerated Values: BOUNDING_BOX OBLIQUE_PLANES INCLUDE_SEG EXCLUDE_SEG See Section C.11.24.1 for description of terms.
>Bounding Box Crop | (0070,1303) | 1C | A cuboid containing the source volume data to be included. The axes of the cuboid are aligned to the axes of encoded source volume. The bounding box is defined by the (x,y,z) coordinates in mm of two opposite corners in the Volumetric Presentation State Reference Coordinate System. ### Note If the source volume consists of gantry tilted slices (e.g., CT) then the bounding box will be a cuboid in the encoded image space, but a parallelepiped in the VPS-RCS. Required if Volume Cropping Method (0070,1302) has a value of BOUNDING_BOX.
>Oblique Cropping Plane Sequence | (0070,1304) | 1C | Oblique cropping planes that contain the source volume data to be included. One or more Items shall be included in this Sequence. Required if Volume Cropping Method (0070,1302) has a value of OBLIQUE.
>>Plane | (0070,1305) | 1 | A plane described by a four-tuple (A,B,C,D) describing coordinates in mm of the plane equation Ax+By+Cz+D=0 relative to the Volumetric Presentation State Reference Coordinate System.
>>Plane Normal | (0070,1306) | 1 | Vector of the normal to the plane pointing outside of the volume to be included, encoded as x, y and z values of a unit vector (direction cosine) in the Volumetric Presentation State Reference Coordinate System.
>Referenced Image Sequence | (0008,1140) | 1C | Instances of the Segmentation Storage SOP Class (1.2.840.10008.​5.​1.​4.​1.​1.​66.​4) containing segments specifying the included or excluded source volume data. Each referenced Segmentation Instance shall have Segmentation Type (0062,0001) value of BINARY and shall share a Frame of Reference with one or more Input Volumes. One or more Items shall be included in this Sequence. Required if Volume Cropping Method (0070,1302) has a value of INCLUDE_SEG or EXCLUDE_SEG. ### Note Surface Segmentation instances are not referenced by this element.
>>Include Table 10-3 “Image SOP Instance Reference Macro Attributes” |

#### C.11.24.1 Volume Cropping

Cropping is an operation in which a portion of the source volume is ignored during subsequent volumetric processing, using one of the methods specified by Volume Cropping Method (0070,1302) :

BOUNDING_BOX

  The source volume data within a bounding box are included in the View

OBLIQUE_PLANES

  The source volume data within a closed surface described by a set of arbitrarily-oriented planes are included in the View

INCLUDE_SEG

  Source volume data should be included in the View if and only if the data is within any of the referenced Segments that share its value of Input Sequence Position Index (0070,1203) (if specified)

EXCLUDE_SEG

  Source volume data should be included in the View if and only if the data is not within any of the referenced Segments that share its value of Input Sequence Position Index (0070,1203) (if specified)

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DICOM PS3.3 2020a - Information Object Definitions