Computed Radiography ImageCIOD
Nuclear Medicine ImageCIOD
Ultrasound ImageCIOD
Ultrasound Multi-frame ImageCIOD
Secondary Capture ImageCIOD
Multi-frame Single Bit Secondary Capture ImageCIOD
Multi-frame Grayscale Byte Secondary Capture ImageCIOD
Multi-frame Grayscale Word Secondary Capture ImageCIOD
Multi-frame True Color Secondary Capture ImageCIOD
X-Ray Angiographic ImageCIOD
X-Ray Radiofluoroscopic ImageCIOD
RT Structure SetCIOD
Positron Emission Tomography ImageCIOD
Digital X-Ray ImageCIOD
Digital Mammography X-Ray ImageCIOD
Digital Intra-Oral X-Ray ImageCIOD
RT Beams Treatment RecordCIOD
RT Brachy Treatment RecordCIOD
RT Treatment Summary RecordCIOD
VL Endoscopic ImageCIOD
VL Microscopic ImageCIOD
VL Slide-Coordinates Microscopic ImageCIOD
VL Photographic ImageCIOD
Video Endoscopic ImageCIOD
Video Microscopic ImageCIOD
Video Photographic ImageCIOD
VL Whole Slide Microscopy ImageCIOD
Real-Time Video Endoscopic ImageCIOD
Real-Time Video Photographic ImageCIOD
Dermoscopic Photography ImageCIOD
Grayscale Softcopy Presentation StateCIOD
Color Softcopy Presentation StateCIOD
Pseudo-Color Softcopy Presentation StateCIOD
Blending Softcopy Presentation StateCIOD
Basic Structured DisplayCIOD
XA/XRF Grayscale Softcopy Presentation StateCIOD
Advanced Blending Presentation StateCIOD
Variable Modality LUT Softcopy Presentation StateCIOD
Basic Voice Audio WaveformCIOD
Ambulatory ECGCIOD
Hemodynamic WaveformCIOD
Basic Cardiac Electrophysiology WaveformCIOD
Arterial Pulse WaveformCIOD
Respiratory WaveformCIOD
General Audio WaveformCIOD
Real-Time Audio WaveformCIOD
Routine Scalp ElectroencephalogramCIOD
Sleep ElectroencephalogramCIOD
Multi-channel Respiratory WaveformCIOD
Body Position WaveformCIOD
General 32-bit ECGCIOD
Basic Text SRCIOD
Enhanced SRCIOD
Comprehensive SRCIOD
Key Object Selection DocumentCIOD
Mammography CAD SRCIOD
Procedure LogCIOD
X-Ray Radiation Dose SRCIOD
Spectacle Prescription ReportCIOD
Macular Grid Thickness and Volume ReportCIOD
Implantation Plan SR DocumentCIOD
Comprehensive 3D SRCIOD
Radiopharmaceutical Radiation Dose SRCIOD
Extensible SRCIOD
Acquisition Context SRCIOD
Simplified Adult Echo SRCIOD
Patient Radiation Dose SRCIOD
Planned Imaging Agent Administration SRCIOD
Performed Imaging Agent Administration SRCIOD
Rendition Selection DocumentCIOD
Enhanced X-Ray Radiation Dose SRCIOD
Enhanced MR ImageCIOD
MR SpectroscopyCIOD
Enhanced MR Color ImageCIOD
Raw DataCIOD
Enhanced CT ImageCIOD
Spatial RegistrationCIOD
Deformable Spatial RegistrationCIOD
Spatial FiducialsCIOD
Ophthalmic Photography 8 Bit ImageCIOD
Ophthalmic Photography 16 Bit ImageCIOD
Stereometric RelationshipCIOD
Hanging ProtocolCIOD
SOP CommonMModule - Hanging Protocol
Hanging Protocol DefinitionMModule - Hanging Protocol
Hanging Protocol EnvironmentMModule - Hanging Protocol
Hanging Protocol DisplayMModule - Hanging Protocol
(0072,0200) Display Sets Sequence1Sequence
(0072,0032) Image Set Number1Unsigned Short
(0072,0202) Display Set Number1Unsigned Short
(0072,0203) Display Set Label3Long String
(0072,0204) Display Set Presentation Group1Unsigned Short
(0072,0206) Display Set Presentation Group Description3Long String
(0072,0300) Image Boxes Sequence1Sequence
(0072,0400) Filter Operations Sequence2Sequence
(0072,0500) Blending Operation Type3Code String
(0072,0510) Reformatting Operation Type3Code String
(0072,0512) Reformatting Thickness1CDouble
(0072,0514) Reformatting Interval1CDouble
(0072,0516) Reformatting Operation Initial View Direction1CCode String
(0072,0520) 3D Rendering Type1CCode String
(0072,0600) Sorting Operations Sequence2Sequence
(0020,9167) Functional Group Pointer1CAttribute Tag
(0020,9238) Functional Group Private Creator1CLong String
(0072,0026) Selector Attribute1CAttribute Tag
(0072,0028) Selector Value Number1CUnsigned Short
(0072,0052) Selector Sequence Pointer1CAttribute Tag
(0072,0054) Selector Sequence Pointer Private Creator1CLong String
(0072,0056) Selector Attribute Private Creator1CLong String
(0072,0602) Sort-by Category1CCode String
(0072,0604) Sorting Direction1Code String
(0072,0700) Display Set Patient Orientation3Code String
(0072,0702) VOI Type3Code String
(0072,0704) Pseudo-Color Type3Code String
(0072,0705) Pseudo-Color Palette Instance Reference Sequence1CSequence
(0072,0706) Show Grayscale Inverted3Code String
(0072,0710) Show Image True Size Flag3Code String
(0072,0712) Show Graphic Annotation Flag3Code String
(0072,0714) Show Patient Demographics Flag3Code String
(0072,0716) Show Acquisition Techniques Flag3Code String
(0072,0717) Display Set Horizontal Justification3Code String
(0072,0718) Display Set Vertical Justification3Code String
(0072,0208) Partial Data Display Handling2Code String
(0072,0210) Synchronized Scrolling Sequence3Sequence
(0072,0214) Navigation Indicator Sequence3Sequence
Encapsulated PDFCIOD
Encapsulated CDACIOD
Real World Value MappingCIOD
Enhanced XA ImageCIOD
Enhanced XRF ImageCIOD
RT Ion Beams Treatment RecordCIOD
Ophthalmic Tomography ImageCIOD
X-Ray 3D Angiographic ImageCIOD
X-Ray 3D Craniofacial ImageCIOD
Breast Tomosynthesis ImageCIOD
Enhanced PET ImageCIOD
Surface SegmentationCIOD
Color PaletteCIOD
Enhanced US VolumeCIOD
Lensometry MeasurementsCIOD
Autorefraction MeasurementsCIOD
Keratometry MeasurementsCIOD
Subjective Refraction MeasurementsCIOD
Visual Acuity MeasurementsCIOD
Ophthalmic Axial MeasurementsCIOD
Intraocular Lens CalculationsCIOD
Generic Implant TemplateCIOD
Implant Assembly TemplateCIOD
Implant Template GroupCIOD
RT Beams Delivery InstructionCIOD
Ophthalmic Visual Field Static Perimetry MeasurementsCIOD
Intravascular Optical Coherence Tomography ImageCIOD
Ophthalmic Thickness MapCIOD
Surface Scan MeshCIOD
Surface Scan Point CloudCIOD
Legacy Converted Enhanced CT ImageCIOD
Legacy Converted Enhanced MR ImageCIOD
Legacy Converted Enhanced PET ImageCIOD
Corneal Topography MapCIOD
Breast Projection X-Ray ImageCIOD
Parametric MapCIOD
Wide Field Ophthalmic Photography Stereographic Projection ImageCIOD
Wide Field Ophthalmic Photography 3D Coordinates ImageCIOD
Tractography ResultsCIOD
RT Brachy Application Setup Delivery InstructionCIOD
Planar MPR Volumetric Presentation StateCIOD
Volume Rendering Volumetric Presentation StateCIOD
Content Assessment ResultsCIOD
CT Performed Procedure ProtocolCIOD
CT Defined Procedure ProtocolCIOD
Protocol ApprovalCIOD
XA Performed Procedure ProtocolCIOD
XA Defined Procedure ProtocolCIOD
Ophthalmic Optical Coherence Tomography En Face ImageCIOD
Ophthalmic Optical Coherence Tomography B-scan Volume AnalysisCIOD
Encapsulated STLCIOD
Encapsulated OBJCIOD
Encapsulated MTLCIOD
RT Physician IntentCIOD
RT Segment AnnotationCIOD
RT Radiation SetCIOD
C-Arm Photon-Electron RadiationCIOD
Tomotherapeutic RadiationCIOD
Robotic-Arm RadiationCIOD
RT Radiation Record SetCIOD
RT Radiation Salvage RecordCIOD
C-Arm Photon-Electron Radiation RecordCIOD
Tomotherapeutic Radiation RecordCIOD
Robotic-Arm Radiation RecordCIOD
RT Radiation Set Delivery InstructionCIOD
RT Treatment PreparationCIOD
Enhanced RT ImageCIOD
Enhanced Continuous RT ImageCIOD
RT Patient Position Acquisition InstructionCIOD
Microscopy Bulk Simple AnnotationsCIOD
Photoacoustic ImageCIOD
Confocal Microscopy ImageCIOD
Confocal Microscopy Tiled Pyramidal ImageCIOD
Basic DirectoryCIOD

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 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.

Sort-by Category Attribute

TypeConditionally Required (1C)
Value Multiplicity1
Value RepresentationCode String (CS)

Category of the sorting operation. See Section C.

Defined Terms:


for CT, MR, other cross-sectional image sets


Required if Selector Attribute (0072,0026) is not present.

Section C.

C. Sorting Operations Sequence

The Items in the Sorting Operations Sequence (0072,0600) define the order in which the images resulting from the filter and reformat operations on the Image Set are to be displayed in the associated Image Boxes of the Display Set. The sorting criteria may include the value of a numeric, date, or time Attribute that is expected to be present in each of the image objects in the filtered Image Set, and/or an abstract sorting category. A sorting direction shall be associated with each sorting criterion. If a textual Attribute is used for sorting, then the INCREASING sorting direction indicates alphabetical order, and DECREASING indicates reverse alphabetical order.

If a Code Sequence Attribute is used for sorting, then Code Meaning (0008,0104) shall be sorted alphabetically. If a string numeric Attribute is used for sorting (VR of IS or DS), then sorting shall be on the numeric value, and padding shall be ignored. When sorting by date or time Attribute, then sorting shall be on the temporal value, not the alphabetic string.

If there are multiple Items in the Sorting Operations Sequence (0072,0600), then the sorting operations shall be applied in Item order. The least rapidly varying Attribute for the sorting operation shall be the first Item in the Sequence.


For example, a Sorting Operations Sequence (0072,0600) with two Items:

  • Item #1: (0018,5101) View Position, INCREASING

  • Item #2: (0008,0020) Study Date, INCREASING

results in the following order, based on these Attribute values in the image objects:

View Position (0018,5101)

Study Date (0008,0020)













When the Sort-by Category (0072,0602) is used with a value of ALONG_AXIS, such as for CT, MR or other cross-sectional image sets, the sorting operation is computed from the values Image Position (Patient) (0020,0032) and Image Orientation (Patient) (0020,0037) in the image objects.

For the image set to be displayed, a "dominant axis" of the set shall be determined. The dominant axis is the normal to Image Orientation (Patient) (0020,0037) (assuming all selected images are parallel), computed as the dot product in a right-handed coordinate system (see Section C. The INCREASING direction for ALONG_AXIS of the image set shall be in the positive direction along the dominant axis. The DECREASING direction shall be in the negative direction along that axis.

When the Sort-by Category (0072,0602) is used with a value of BY_ACQ_TIME, the sorting operation is computed from appropriate values in the image objects (e.g., Frame Acquisition DateTime, Acquisition Time, Content Time, Acquisition DateTime), since the specific Attribute used may vary from one Image Instance or SOP Class to another, yet the Hanging Protocol Instance may be generally applicable.

An application that is applying a Hanging Protocol Instance shall support any value for Selector Attribute (0072,0026), provided that it is present in the referenced Image Set. The Attributes of the Hanging Protocol Selector Attribute Context Macro specify whether Selector Attribute (0072,0026) is contained in a Sequence, Functional Group Sequence or Private Group.


  1. The following Attributes from image IODs are examples of some possible values for Selector Attribute (0072,0026) of Sorting Operations Sequence (0072,0600). This is not a complete list:

    • Acquisition DateTime (0008,002A)

    • Acquisition Time (0008,0032)

    • Echo Time (0018,0081)

    • Echo Number(s) (0018,0086)

    • Trigger Time (0018,1060)

    • View Position (0018,5101)

    • Effective Echo Time (0018,9082)

    • Acquisition Number (0020,0012)

    • Instance Number (0020,0013)

    • Slice Location (0020,1041), although Sort-by Category (0072,0602) with value ALONG_AXIS may be more reliable

    • Trigger Delay Time (0020,9153)

    • Stage Number (0008,2122)

    • View Number (0008,2128)

  2. For a multi-frame image set, it is the responsibility of the application to apply the sorting operations to individual frames within a multi-frame Image Instance in the image set, versus multiple single-frame Image Instances in the image set that represent individual frames.