DICOM PS3.3 2017b - Information Object Definitions

C.11.26 Multi-Planar Reconstruction Geometry Module
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### C.11.26 Multi-Planar Reconstruction Geometry Module

Table C.11.26-1 contains Attributes that describe the geometry of this Multi-Planar Reconstruction view.

Table C.11.26-1. Multi-Planar Reconstruction Geometry Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Multi-Planar Reconstruction Style | (0070,1501) | 1 | Style of the MPR view. Enumerated Values: PLANAR by a Euclidean plane
MPR Thickness Type | (0070,1502) | 1 | Specifies whether the Multi-Planar Reconstruction surface has thickness. Enumerated Values: THIN a rendering of nominally minimal but unspecified thickness SLAB an orthographic rendering of a volume with a defined thickness See Section C.11.26.1.
MPR Slab Thickness | (0070,1503) | 1C | Thickness of the Multi-Planar Reconstruction slab as a value greater than zero, in mm. See Section C.11.26.1. Required if MPR Thickness Type (0070,1502) has a value of SLAB.
MPR View Width Direction | (0070,1507) | 1C | Direction cosine (x,y,z) indicating the direction within the VPS RCS of the top row of the MPR view. See Section C.11.26.1. Required if Multi Planar Reconstruction Style (0070,1501) is PLANAR.
MPR View Width | (0070,1508) | 1C | Width of the MPR view, in mm. See Section C.11.26.1. Required if Multi Planar Reconstruction Style (0070,1501) is PLANAR.
MPR View Height Direction | (0070,1511) | 1C | Direction cosine (x,y,z) indicating the direction within the VPS RCS of the leftmost column of the MPR view. See Section C.11.26.1. Required if Multi Planar Reconstruction Style (0070,1501) is PLANAR.
MPR View Height | (0070,1512) | 1C | Height of the MPR view, in mm. See Section C.11.26.1. Required if Multi Planar Reconstruction Style (0070,1501) is PLANAR.
MPR Top Left Hand Corner | (0070,1505) | 1C | The 3D location in the Volumetric Presentation State - Reference Coordinate System of the upper left hand corner of the MPR View rectangle, in mm. See Section C.11.26.1.1. Required if Multi-Planar Reconstruction Style (0070,1501) has a value of PLANAR.

#### C.11.26.1 Multi-Planar Reconstruction Styles

A Multi-Planar Reconstruction (or MPR) is one of the styles described in this section.

##### C.11.26.1.1 Planar Style

Figure C.11.26-1. Volume Rendering with visualization of MPR plane orientation and resulting PLANAR MPR rendering

A PLANAR MPR is a thin slice or thick slab of the input volume defined by a geometric plane as illustrated by Figure C.11.26-1. Figure C.11.26-2 and Figure C.11.26-3 depict the relationships between MPR Geometry Module attributes and Thin and Slab MPR views, respectively.

Figure C.11.26-2. Planar MPR THIN Geometry

The following attributes describe the PLANAR MPR:

- MPR View Width Direction (0070,1507) and MPR View Height Direction (0070,1511) specify the orientation of the MPR view rectangle in the Volumetric Presentation State Reference Coordinate System

- MPR View Width (0070,1508) and MPR View Height (0070,1512) specify the size of the MPR view rectangle in the Volumetric Presentation State Reference Coordinate System

- MPR Top Left Hand Corner (0070,1505) species the position of the upper-left corner of the MPR view rectangle in the Volumetric Presentation State Reference Coordinate System

- MPR Thickness Type (0070,1502) specifies whether the MPR is created by taking a single sample for each pixel (THIN) or by creating an orthographic rendering of a slab volume with a defined thickness using the method defined by Rendering Method (0070,120D) (SLAB). If the specified thickness is below an application-determined limit the resulting view shall be treated as a THIN MPR.

- MPR Slab Thickness (0070,1503) specifies the thickness of the slab if MPR Thickness Type (0070,1502) is SLAB. The slab volume is positioned such that the MPR view defined by MPR View Width Direction (0070,1507), MPR View Width (0070,1508), MPR View Height Direction (0070,1511), MPR View Height (0070,1512), and MPR Top Left Hand Corner (0070,1505) is at the midpoint of the slab thickness.

Figure C.11.26-3. Planar MPR SLAB Geometry

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DICOM PS3.3 2017b - Information Object Definitions