Reconstruction Pixel Spacing Attribute
| Tag | (0018,9322) |
|---|---|
| Type | Conditionally Required (1C) |
| Keyword | ReconstructionPixelSpacing |
| Value Multiplicity | 2 |
| Value Representation | Double (FD) |
Physical distance in the patient between the center of each reconstructed pixel, specified by a numeric pair - adjacent row spacing (delimiter) adjacent column spacing in mm. See Section 10.7.1.3 for further explanation of the value order.
Note
The values of Reconstruction Pixel Spacing (0018,9322) will equal the corresponding values of Pixel Spacing (0028,0030) unless the pixel data has been post-processed to change the pixel size after reconstruction and before storage.
Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.
Note
Part of the CT Reconstruction Functional Group Macro with usage: C
Required if Image Type (0008,0008) Value 1 is ORIGINAL or MIXED and Acquisition Type (0018,9302) is other than CONSTANT_ANGLE, may be present otherwise.
Section 10.7.1.3
10.7.1.3 Pixel Spacing Value Order and Valid Values
All pixel spacing related Attributes are encoded as the physical distance between the centers of each two-dimensional pixel, specified by two numeric values.
The first value is the row spacing in mm, that is the spacing between the centers of adjacent rows, or vertical spacing.
The second value is the column spacing in mm, that is the spacing between the centers of adjacent columns, or horizontal spacing.
To illustrate, consider the example shown in Figure 10.7.1.3-1.
Figure 10.7.1.3-1. Example of Pixel Spacing Value Order
Pixel Spacing = Row Spacing \ Column Spacing = 0.30\0.25.
All pixel spacing related Attributes shall have positive non-zero values, except when there is only a single row or column or pixel of data present, in which case the corresponding value may be zero.
Note
A single row or column or "pixel" may occur in MR Spectroscopy Instances.
This description applies to:
-
Pixel Spacing (0028,0030)
-
Imager Pixel Spacing (0018,1164)
-
Nominal Scanned Pixel Spacing (0018,2010)
-
Image Plane Pixel Spacing (3002,0011)
-
Compensator Pixel Spacing (300A,00E9)
-
Detector Element Spacing (0018,7022)
-
Presentation Pixel Spacing (0070,0101)
-
Printer Pixel Spacing (2010,0376)
-
Object Pixel Spacing in Center of Beam (0018,9404)