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Frame of ReferenceCModule - Frame of Reference
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General EquipmentMModule - Equipment
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Image PixelMModule - Image
Enhanced Contrast/BolusCModule - Image
MaskUModule - Image
DeviceUModule - Image
InterventionUModule - Image
Acquisition ContextMModule - Image
Multi-frame Functional GroupsMModule - Image
(0008,0023) Content Date1Date
(0008,0033) Content Time1Time
(0020,0013) Instance Number1Integer String
(0020,0242) SOP Instance UID of Concatenation Source1CUnique Identifier
(0020,9161) Concatenation UID1CUnique Identifier
(0020,9162) In-concatenation Number1CUnsigned Short
(0020,9163) In-concatenation Total Number3Unsigned Short
(0020,9228) Concatenation Frame Offset Number1CUnsigned Long
(0022,0028) Stereo Pairs Present3Code String
(0028,0008) Number of Frames1Integer String
(0028,6010) Representative Frame Number3Unsigned Short
(5200,9229) Shared Functional Groups Sequence1Sequence
(0008,1140) Referenced Image Sequence2Sequence
(0008,9124) Derivation Image Sequence2Sequence
(0018,9118) Cardiac Synchronization Sequence1Sequence
(0018,9341) Contrast/Bolus Usage Sequence1Sequence
(0018,9401) Projection Pixel Calibration Sequence1Sequence
(0018,9405) Positioner Position Sequence1Sequence
(0018,9406) Table Position Sequence1Sequence
(0018,9407) Collimator Shape Sequence1Sequence
(0018,9412) XA/XRF Frame Characteristics Sequence1Sequence
(0018,9417) Frame Acquisition Sequence1Sequence
(0018,9432) Field of View Sequence1Sequence
(0018,9434) Exposure Control Sensing Regions Sequence1Sequence
(0018,9451) Frame Detector Parameters Sequence1Sequence
(0018,9455) Calibration Sequence1Sequence
(0018,9456) Object Thickness Sequence1Sequence
(0018,9462) Isocenter Reference System Sequence1Sequence
(0018,9472) Frame Display Shutter Sequence1Sequence
(0018,9476) X-Ray Geometry Sequence1Sequence
(0018,9477) Irradiation Event Identification Sequence1Sequence
(0020,9071) Frame Anatomy Sequence1Sequence
(0020,9111) Frame Content Sequence1Sequence
(0020,9253) Respiratory Synchronization Sequence1Sequence
(0020,9450) Patient Orientation in Frame Sequence1Sequence
(0028,9132) Frame VOI LUT Sequence1Sequence
(0028,9415) Frame Pixel Shift Sequence1Sequence
(0028,9422) Pixel Intensity Relationship LUT Sequence1Sequence
(0028,9443) Frame Pixel Data Properties Sequence1Sequence
(0008,9007) Frame Type1Code String
(0018,1164) Imager Pixel Spacing1CDecimal String
(0018,7036) Pixel Data Area Origin Relative To FOV3Single
(0018,7038) Pixel Data Area Rotation Angle Relative To FOV3Single
(0028,1040) Pixel Intensity Relationship1Code String
(0028,1041) Pixel Intensity Relationship Sign1Signed Short
(0028,9444) Geometrical Properties1Code String
(0028,9445) Geometric Maximum Distortion2CSingle
(0028,9446) Image Processing Applied1Code String
(5200,9230) Per-Frame Functional Groups Sequence1CSequence
(7FE0,0003) Encapsulated Pixel Data Value Total Length3UV
Multi-frame DimensionUModule - Image
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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.

Imager Pixel Spacing Attribute

Tag(0018,1164)
TypeConditionally Required (1C)
KeywordImagerPixelSpacing
Value Multiplicity2
Value RepresentationDecimal String (DS)
Example Values
  • [.070, .070]
  • [0.19444444, 0.19444444]
  • [0.143, 0.143]

Physical distance measured at the receptor plane of the detector between the centers of each pixel specified by a numeric pair - row spacing value (delimiter) column spacing value in mm. See Section 10.7.1.3 for further explanation of the value order.

The value of this Attribute shall never be adjusted to account for calibration against an object of known size; Pixel Spacing (0028,0030) is specified for that purpose.

It is only allowed to be adjusted to compensate for the change of the Field of View Dimension(s) in Float (0018,9461) Attribute. See Section C.8.19.6.4.1.2

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

Note

These values are the actual pixel spacing distances of the stored pixel values of an image.

Note

Part of the X-Ray Frame Pixel Data Properties Functional Group Macro with usage: M

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)

Section C.8.19.6.4.1.2

C.8.19.6.4.1.2 Imager Pixel Spacing

The two values of the Imager Pixel Spacing (0018,1164) Attribute are related to the value(s) of the Field of View Dimension(s) in Float (0018,9461) Attribute in the X-Ray Field of View Functional Group of this frame and the values of the Rows (0028,0010) and Columns (0028,0011) Attributes.

The value(s) of Field of View Dimension(s) in Float (0018,9461) may change on a frame by frame base. The values of the Rows and Columns Attributes are equal for all frames. The relationship between the Attributes depends on the Field of View Shape (0018,1147) Attribute:

If the Field of View Shape (0018,1147) Attribute equals RECTANGLE:

Imager Pixel Spacingrow spacing = FOV Dimensionrow dimension / Rows

Imager Pixel Spacingcolumn spacing = FOV Dimensioncolumn dimension / Columns

If the Field of View Shape (0018,1147) Attribute equals ROUND or HEXAGONAL:

Imager Pixel Spacingrow spacing = FOV Dimensiondiameter / Rows

Imager Pixel Spacingcolumn spacing = FOV Dimensiondiameter / Columns