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
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
PatientMModule - Patient
Clinical Trial SubjectUModule - Patient
General StudyMModule - Study
Patient StudyUModule - Study
Clinical Trial StudyUModule - Study
General SeriesMModule - Series
Clinical Trial SeriesUModule - Series
DX SeriesMModule - Series
Enhanced Mammography SeriesMModule - Series
Frame of ReferenceMModule - Frame of Reference
SynchronizationCModule - Frame of Reference
General EquipmentMModule - Equipment
Enhanced General EquipmentMModule - Equipment
Enhanced Mammography ImageMModule - Image
(0008,002A) Acquisition DateTime1Date Time
(0018,0060) KVP1Decimal String
(0018,1190) Focal Spot(s)1Decimal String
(0018,1191) Anode Target Material1Code String
(0018,11A0) Body Part Thickness1Decimal String
(0018,11A2) Compression Force1Decimal String
(0018,11A3) Compression Pressure3Decimal String
(0018,11A4) Paddle Description1Long String
(0018,11A5) Compression Contact Area3Decimal String
(0018,1411) Exposure Index3Decimal String
(0018,1412) Target Exposure Index3Decimal String
(0018,1413) Deviation Index3Decimal String
(0018,1500) Positioner Motion1Code String
(0018,1508) Positioner Type1Code String
(0018,6000) Sensitivity3Decimal String
(0018,7000) Detector Conditions Nominal Flag3Code String
(0018,7001) Detector Temperature3Decimal String
(0018,7004) Detector Type2Code String
(0018,7005) Detector Configuration3Code String
(0018,7006) Detector Description3Long Text
(0018,7008) Detector Mode3Long Text
(0018,700A) Detector ID3Short String
(0018,700C) Date of Last Detector Calibration3Date
(0018,700E) Time of Last Detector Calibration3Time
(0018,7010) Exposures on Detector Since Last Calibration3Integer String
(0018,7011) Exposures on Detector Since Manufactured3Integer String
(0018,7012) Detector Time Since Last Exposure3Decimal String
(0018,701A) Detector Binning3Decimal String
(0018,7020) Detector Element Physical Size3Decimal String
(0018,7022) Detector Element Spacing3Decimal String
(0018,7024) Detector Active Shape3Code String
(0018,7026) Detector Active Dimension(s)3Decimal String
(0018,7028) Detector Active Origin3Decimal String
(0018,702A) Detector Manufacturer Name3Long String
(0018,702B) Detector Manufacturer's Model Name3Long String
(0018,7060) Exposure Control Mode1Code String
(0018,7062) Exposure Control Mode Description1Long Text
(0018,9004) Content Qualification1Code String
(0018,9073) Acquisition Duration1Double
(0018,9328) Exposure Time in ms1CDouble
(0018,9330) X-Ray Tube Current in mA1CDouble
(0018,9332) Exposure in mAs1CDouble
(0020,0020) Patient Orientation1CCode String
(0020,4000) Image Comments3Long Text
(0028,0002) Samples per Pixel1Unsigned Short
(0028,0004) Photometric Interpretation1Code String
(0028,0100) Bits Allocated1Unsigned Short
(0028,0101) Bits Stored1Unsigned Short
(0028,0102) High Bit1Unsigned Short
(0028,0103) Pixel Representation1Unsigned Short
(0028,0300) Quality Control Image3Code String
(0028,0301) Burned In Annotation1Code String
(0028,2110) Lossy Image Compression1Code String
(0028,2112) Lossy Image Compression Ratio1CDecimal String
(0028,2114) Lossy Image Compression Method1CCode String
(0040,0316) Organ Dose1Decimal String
(0040,8302) Entrance Dose in mGy1Decimal String
(0040,8303) Entrance Dose Derivation3Code String
(0054,0202) Type of Detector Motion1Code String
(0088,0200) Icon Image Sequence3Sequence
(2050,0020) Presentation LUT Shape1Code String
Breast ViewMModule - Image
Image PixelMModule - Image
Enhanced Contrast/BolusCModule - Image
DeviceUModule - Image
InterventionUModule - Image
Acquisition ContextMModule - Image
Multi-frame Functional GroupsMModule - Image
Multi-frame DimensionUModule - Image
Patient OrientationMModule - Image
SpecimenUModule - Image
SOP CommonMModule - Image
Common Instance ReferenceUModule - Image
Frame ExtractionCModule - Image
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.

Acquisition DateTime Attribute

TypeRequired (1)
Value Multiplicity1
Value RepresentationDate Time (DT)

The date and time that the acquisition of data that resulted in this image started.


The synchronization of this time with an external clock is specified in the Synchronization Module in Acquisition Time Synchronized (0018,1800).

Synchronization Module

C.7.4.2 Synchronization Module

Table C.7-7 specifies the Attributes of the Synchronization Module, which are necessary to uniquely identify a Frame of Reference that establishes the temporal relationship of SOP Instances. A synchronized environment may be established based on a shared time of day clock, and/or on a shared trigger event or synchronization waveform channel.


Within a synchronized environment, different devices may use the shared data differently. An electrical pulse, for example, may be treated as a trigger event by one device (e.g., an X-Ray imaging system), but may be recorded as a synchronization waveform by another device (e.g., a hemodynamics system).

Table C.7-7. Synchronization Module Attributes

Attribute Name



Attribute Description

Synchronization Frame of Reference UID



UID of common synchronization environment. See Section C.

Synchronization Trigger



Data acquisition synchronization with external equipment

Enumerated Values:


this equipment provides synchronization channel or trigger to other equipment


this equipment receives synchronization channel or trigger from other equipment


this equipment receives synchronization channel or trigger and forwards it


data acquisition not synchronized by common channel or trigger

Trigger Source or Type



Specifies equipment ID of trigger source and/or type of trigger.

Synchronization Channel



Identifier of waveform channel that records the synchronization channel or trigger, see Section C.

Required if synchronization channel or trigger is encoded in a waveform in this SOP Instance.

Acquisition Time Synchronized



Acquisition DateTime (0008,002A) synchronized with external time reference.

Enumerated Values:



See Section C.

Time Source



ID of equipment or system providing time reference.

Time Distribution Protocol



Method of time distribution used to synchronize this equipment.

Enumerated Values:


Network Time Protocol


Inter Range Instrumentation Group


Global Positioning System


Simple Network Time Protocol


IEEE 1588 Precision Time Protocol

NTP Source Address



IP Address of NTP, SNTP, or PTP time source. IPv4 addresses shall be in dotted decimal (e.g., The IPv6 addresses shall be in colon separated hexadecimal (e.g., 12:34:56:78:9a:bc:de:f0).


Identity of this value in two Instances acquired contemporaneously implies a common time base. The NTP Source Address might not persist over time.

C. Synchronization Module Attribute Descriptions
C. Synchronization Frame of Reference UID

A set of equipment may share a common acquisition synchronization environment, which is identified by a Synchronization Frame of Reference UID. All SOP Instances that share the same Synchronization Frame of Reference UID shall be temporally related to each other. If a Synchronization Frame of Reference UID is present, all SOP Instances in the Series must share the same Frame of Reference.

The UTC Synchronization UID, 1.2.840.10008.15.1.1, may be used when the equipment is synchronized to the international standard UTC. In this case the quality of synchronization may be determined by means of the Time Distribution Protocol (0018,1802) and NTP Source Address (0018,1803).


  1. The Synchronization Frame of Reference UID defines an equipment synchronization environment, and does not need to be changed for each unrelated acquisition. SOP Instances may therefore share a Synchronization Frame of Reference UID, but be clinically unrelated (e.g., apply to different Patients).

  2. When a synchronization environment is recalibrated, a new UID must be issued.

  3. The method of distributing the Synchronization Frame of Reference UID to multiple devices is not specified.

C. Time Source and Time Distribution Protocol

Time may originate with a primary source (e.g., a national standards bureau) and be distributed through a chain of secondary distribution systems until reaching the imaging equipment. Time Distribution Protocol (0018,1802) specifies the immediate (last link) method used by the equipment to receive time from the immediately prior Time Source (0018,1801). It does not specify the ultimate time reference from which the Time Source may derive its synchronization.


The time value distributed through the specified Time Distribution Protocol may need to be corrected to align with UTC. For example, GPS does not compensate for leap seconds.

C. Synchronization Channel

Synchronization Channel (0018,106C) is specified as a pair of values (M,C), where the first value is the ordinal of the Sequence Item of Waveform Sequence (5400,0100) (i.e., the Multiplex Group), and the second value is the ordinal of the Sequence Item of the Channel Definition Sequence (003A,0200) Attribute (i.e., the Waveform Channel Number) within the multiplex group.

C. Acquisition Time Synchronized

The Acquisition Time Synchronized (0018,1800) Attribute specifies whether Acquisition DateTime (0008,002A) of the Waveform Identification Module or the General Image Module represents an accurate synchronized timestamp for the acquisition of the waveform and/or image data. For triggered multi-frame images, the Acquisition DateTime applies to the trigger for the first image frame (see Attribute Image Trigger Delay (0018,1067) in the Cine Module).


The degree of precision of the Acquisition DateTime and its accuracy relative to the external clock are not specified, but need to be appropriate for the clinical application.

For IODs that include the SR Document Content Module, the Acquisition Time Synchronized (0018,1800) Attribute specifies whether Observation DateTime (0040,A032) of Items in Content Sequence (0040,A730) of the SR Document Content Module represents an accurate synchronized timestamp for the Item.

For IODs that include the RT Radiation Record Common Module, the Acquisition Time Synchronized (0018,1800) Attribute specifies whether the following Attributes represent a synchronized timestamp.

  • Recorded RT Control Point DateTime (300A,073A)

  • Interlock DateTime (300A,0741)