CR ImageCIOD
CT ImageCIOD
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RT Structure SetCIOD
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VL Endoscopic ImageCIOD
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Real-Time Video Endoscopic ImageCIOD
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Grayscale Softcopy Presentation StateCIOD
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Pseudo-Color Softcopy Presentation StateCIOD
Blending Softcopy Presentation StateCIOD
Basic Structured DisplayCIOD
XA/XRF Grayscale Softcopy Presentation StateCIOD
Advanced Blending Presentation StateCIOD
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Key Object Selection DocumentCIOD
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Procedure LogCIOD
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Implantation Plan SR DocumentCIOD
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Extensible SRCIOD
Acquisition Context SRCIOD
Simplified Adult Echo SRCIOD
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SegmentationCIOD
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PatientMModule - Patient
Clinical Trial SubjectUModule - Patient
General StudyMModule - Study
Patient StudyUModule - Study
Clinical Trial StudyUModule - Study
General SeriesMModule - Series
Clinical Trial SeriesUModule - Series
Enhanced Mammography SeriesMModule - Series
Frame of ReferenceMModule - Frame of Reference
SynchronizationCModule - Frame of Reference
General EquipmentMModule - Equipment
Enhanced General EquipmentMModule - Equipment
Image PixelMModule - Image
Enhanced Contrast/BolusCModule - 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
(0018,2041) Biopsy Target Sequence1CSequence
(0018,9341) Contrast/Bolus Usage Sequence1Sequence
(0018,9504) X-Ray 3D Frame Type Sequence1Sequence
(0020,9071) Frame Anatomy Sequence1Sequence
(0020,9111) Frame Content Sequence1Sequence
(0020,9113) Plane Position Sequence1Sequence
(0020,9116) Plane Orientation Sequence1Sequence
(0028,9110) Pixel Measures Sequence1Sequence
(0018,0050) Slice Thickness1CDecimal String
(0018,0088) Spacing Between Slices1CDecimal String
(0028,0030) Pixel Spacing1CDecimal String
(0028,9132) Frame VOI LUT Sequence1Sequence
(0028,9145) Pixel Value Transformation Sequence1Sequence
(0040,9096) Real World Value Mapping Sequence1Sequence
(5200,9230) Per-frame Functional Groups Sequence1CSequence
Multi-frame DimensionUModule - Image
Image - Equipment Coordinate RelationshipUModule - Image
SpecimenUModule - Image
X-Ray 3D ImageMModule - Image
Breast Tomosynthesis Contributing SourcesUModule - Image
Breast Tomosynthesis AcquisitionUModule - Image
X-Ray 3D ReconstructionUModule - Image
Breast ViewMModule - Image
SOP CommonMModule - Image
Common Instance ReferenceUModule - Image
Frame ExtractionCModule - Image
Enhanced PET ImageCIOD
Surface SegmentationCIOD
Color PaletteCIOD
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Keratometry MeasurementsCIOD
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Ophthalmic Axial MeasurementsCIOD
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Tractography ResultsCIOD
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CT Performed Procedure ProtocolCIOD
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Basic DirectoryCIOD

Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 12 May 2020. 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.

Pixel Spacing Attribute

Tag(0028,0030)
TypeConditionally Required (1C)
KeywordPixelSpacing
Value Multiplicity2
Value RepresentationDecimal String (DS)

Physical distance in the imaging target (patient, specimen, or phantom) between the centers of each 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

In the case of CT images with an Acquisition Type (0018,9302) of CONSTANT_ANGLE, the pixel spacing is that in a plane normal to the central ray of the diverging X-Ray beam as it passes through the data collection center.

Required if:

  • Volumetric Properties (0008,9206) is other than DISTORTED or SAMPLED, or

  • SOP Class UID is Segmentation Storage ("1.2.840.10008.5.1.4.1.1.66.4") and Frame of Reference UID (0020,0052) is present, or

  • SOP Class UID is Ophthalmic Tomography Image Storage ("1.2.840.10008.5.1.4.1.1.77.1.5.4") and Ophthalmic Volumetric Properties Flag (0022,1622) is YES, or

  • SOP Class UID is Ophthalmic Optical Coherence Tomography B-scan Volume Analysis Storage ("1.2.840.10008.5.1.4.1.1.77.1.5.8").

May be present otherwise.

Note

Part of the Pixel Measures 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)