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
PatientMModule - Patient
Clinical Trial SubjectUModule - Patient
General StudyMModule - Study
Patient StudyUModule - Study
Clinical Trial StudyUModule - Study
General SeriesMModule - Series
Clinical Trial SeriesUModule - Series
SynchronizationUModule - Frame of Reference
General EquipmentMModule - Equipment
Waveform IdentificationMModule - Waveform
WaveformMModule - Waveform
(003A,0230) Waveform Data Display Scale3Single
(003A,0231) Waveform Display Background CIELab Value3Unsigned Short
(003A,0240) Waveform Presentation Group Sequence3Sequence
(5400,0100) Waveform Sequence1Sequence
(0018,1068) Multiplex Group Time Offset1CDecimal String
(0018,1069) Trigger Time Offset1CDecimal String
(0018,106E) Trigger Sample Position3Unsigned Long
(003A,0004) Waveform Originality1Code String
(003A,0005) Number of Waveform Channels1Unsigned Short
(003A,0010) Number of Waveform Samples1Unsigned Long
(003A,001A) Sampling Frequency1Decimal String
(003A,0020) Multiplex Group Label3Short String
(003A,0200) Channel Definition Sequence1Sequence
(003A,0202) Waveform Channel Number3Integer String
(003A,0203) Channel Label3Short String
(003A,0205) Channel Status3Code String
(003A,0208) Channel Source Sequence1Sequence
(003A,0209) Channel Source Modifiers Sequence1CSequence
(003A,020A) Source Waveform Sequence3Sequence
(003A,020C) Channel Derivation Description3Long String
(003A,0210) Channel Sensitivity1CDecimal String
(003A,0211) Channel Sensitivity Units Sequence1CSequence
(003A,0212) Channel Sensitivity Correction Factor1CDecimal String
(003A,0213) Channel Baseline1CDecimal String
(003A,0214) Channel Time Skew1CDecimal String
(003A,0215) Channel Sample Skew1CDecimal String
(003A,0218) Channel Offset3Decimal String
(003A,021A) Waveform Bits Stored1Unsigned Short
(003A,0220) Filter Low Frequency1CDecimal String
(003A,0221) Filter High Frequency1CDecimal String
(003A,0222) Notch Filter Frequency3Decimal String
(003A,0223) Notch Filter Bandwidth3Decimal String
(003A,0312) Channel Impedance Sequence3Sequence
(003A,0317) Waveform Amplifier Type3Code String
(003A,0318) Filter Low Frequency Characteristics Sequence1CSequence
(003A,0319) Filter High Frequency Characteristics Sequence1CSequence
(003A,0320) Summarized Filter Lookup Table Sequence3Sequence
(003A,0321) Notch Filter Characteristics Sequence3Sequence
(5400,0110) Channel Minimum Value3OB or OW
(5400,0112) Channel Maximum Value3OB or OW
(003A,0310) Multiplex Group UID1CUnique Identifier
(003A,0311) Powerline Frequency3Decimal String
(5400,1004) Waveform Bits Allocated1Unsigned Short
(5400,1006) Waveform Sample Interpretation1Code String
(5400,100A) Waveform Padding Value1COB or OW
(5400,1010) Waveform Data1OB or OW
Acquisition ContextMModule - Waveform
Waveform AnnotationUModule - Waveform
SOP CommonMModule - Waveform
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
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.

Channel Definition Sequence Attribute

TypeRequired (1)
Value Multiplicity1
Value RepresentationSequence (SQ)

Sequence of Items, with one Item per channel (see Section C.

One or more Items shall be included in this Sequence.

Ordering of Items in this Sequence is significant for reference to specific channels.

Section C.

C. Channel Definition Sequence
C. Channel Source and Modifiers

Channel Source Sequence (003A,0208) identifies the metric (quality being measured, e.g., voltage or pressure), the anatomical position of the sensor or probe, the function of the channel (e.g., measurement or stimulus), and any particulars of technique that affect those parameters (e.g., pull-back across multiple anatomic sites, or differential input from two distinct sites). If the full semantics of the source is not carried in a single coded entry (e.g., if it specifies the location but not the metric), additional qualifiers are identified in Channel Source Modifiers Sequence (003A,0209) coded entries.

When a single sensor channel is used to collect a waveform from two (or more) anatomic sites, e.g., in hemodynamic pull-back procedures, multiple Channel Source Modifier Items will identify the sequence of sites, if not encoded in the semantics of the Channel Source Coded Entry. Transition times from one site to another may be indicated with an Annotation, or pull-back rate may be indicated with an Acquisition Context Sequence (0040,0555) Item (see Section C.7.6.14).

The Baseline CIDs are defined by IOD in accordance with Section A.34. Restrictions in the IOD may also determine the pattern of specification of the waveform source, i.e., which Item is to be encoded in the Channel Source Sequence, and the order in which Channel Source Modifier Items are to be encoded. Unless otherwise specified, pattern of specification of the waveform source shall be:

  1. If the function of the channel is not measurement, the function (and optionally additional parameters of the channel source) shall be encoded in the Channel Source Item.

  2. If the function of the channel is measurement of a waveform originating in the patient (the implicit default function), the metric (and optionally additional parameters of the channel source) shall be encoded in the Channel Source Item.

  3. If not encoded in the Channel Source Item, and a particular technique needs to be encoded, that technique shall be encoded in the first Channel Source Modifier Item.


For example, an intracardiac measurement of a pressure waveform across the mitral valve by means of a catheter pullback may be encoded in one of the following three ways (using pseudo-coded terminology), depending on the availability of coded terms with sufficient expressive power:

Channel Source

Channel Source Modifiers

X-2311 "pressure measurement"

T-7663 "pullback"C-2001 "mitral valve"

X-2123 "pressure measurement, pullback"

C-2001 "mitral valve"

X-1234 "pressure measurement, mitral valve, pullback"

(none required)

C. Channel Sensitivity and Channel Sensitivity Units

Channel Sensitivity (003A,0210) is the nominal value of one unit (i.e., the least significant bit) of each waveform sample in Waveform Data (5400,1010). It includes both the amplifier gain and the analog-digital converter resolution. It does not relate the vertical scaling of a waveform on a particular display.


A prior release specified Channel Sensitivity Units Sequence (003A,0211) DCID 3082 “Cardiology Measurement Unit (Retired)”. CID 3082 “Cardiology Measurement Unit (Retired)” was a subset of CID 82 “Measurement Unit”, and has been retired in favor of the more general CID 82 “Measurement Unit”. See PS3.3-2011.

Channel Sensitivity Correction Factor (003A,0212) is the ratio of the actual (calibrated) value to the nominal channel sensitivity specified in Channel Sensitivity (003A,0210). Thus a waveform sample value multiplied by the Channel Sensitivity value provides the nominal measured value in Channel Sensitivity Units, and that nominal value multiplied by the Channel Sensitivity Correction Factor provides the calibrated measured value.

C. Channel Skew and Channel Offset

Skew is also known as a sub-sample time delay, typically caused by using a multiplexed analog to digital converter that switches from channel to channel. For analysis it may be important to know if the analog channels were all latched simultaneously or sequentially and then digitized. Skew may be represented as time offset in seconds, or a fractional number of samples.

Separate and additional to skew is an offset time adjustment (sometimes called latency) by which one waveform channel is displaced significantly relative to others before sampling.


As an example, a hemodynamic pressure is measured at the external end of a catheter, and thus its measurement is delayed by the time for the pressure wave to propagate down the catheter. With a dual catheter measurement, two signals may be acquired at the same time, but one arrives by a longer distance (e.g., a pulmonary capillary wedge pressure, compared to a left ventricular pressure). To obtain an accurate comparison of the waveforms (e.g., the gradient across the mitral valve), one waveform has to be offset (perhaps as much as 30 ms) to synchronize them.

C. Waveform Bits Stored

Waveform Bits Stored (003A,021A) specifies the number of significant bits within the Waveform Bits Allocated of each sample, for signed or unsigned integers.

If Waveform Sample Value Representation is MB or AB, Waveform Bits Stored shall be 8.

C. Channel Minimum and Maximum Value

Channel Minimum Value (5400,0110) and Channel Maximum Value (5400,0112) Attributes may be used to send the analog-to-digital converter limits (i.e., the clipping levels).


These values do not represent the maximum and minimum values in the encoded data, but rather the valid range of values.