CR ImageCIOD
CT ImageCIOD
PatientMModule - Patient
Clinical Trial SubjectUModule - Patient
General StudyMModule - Study
Patient StudyUModule - Study
Clinical Trial StudyUModule - Study
General SeriesMModule - Series
Clinical Trial SeriesUModule - Series
Frame of ReferenceMModule - Frame of Reference
General EquipmentMModule - Equipment
General ImageMModule - Image
General ReferenceUModule - Image
Image PlaneMModule - Image
Image PixelMModule - Image
Contrast/BolusCModule - Image
DeviceUModule - Image
SpecimenUModule - Image
CT ImageMModule - Image
Multi-energy CT ImageCModule - Image
(0018,9362) Multi-energy CT Acquisition Sequence1Sequence
(0018,937B) Multi-energy Acquisition Description3Unlimited Text
(0018,9365) Multi-energy CT X-Ray Source Sequence1Sequence
(0018,936F) Multi-energy CT X-Ray Detector Sequence1Sequence
(0018,9379) Multi-energy CT Path Sequence1Sequence
(0018,9321) CT Exposure Sequence1Sequence
(0018,9325) CT X-Ray Details Sequence1Sequence
(0018,9304) CT Acquisition Details Sequence1Sequence
(0018,9312) CT Geometry Sequence1Sequence
(0018,9363) Multi-energy CT Processing Sequence3Sequence
(0018,9364) Multi-energy CT Characteristics Sequence1CSequence
Overlay PlaneUModule - Image
VOI LUTUModule - Image
SOP CommonMModule - Image
Common Instance ReferenceUModule - Image
MR ImageCIOD
NM ImageCIOD
US ImageCIOD
US Multi-frame ImageCIOD
SC ImageCIOD
Multi-frame Single Bit SC ImageCIOD
Multi-frame Grayscale Byte SC ImageCIOD
Multi-frame Grayscale Word SC ImageCIOD
Multi-frame True Color SC ImageCIOD
X-Ray Angiographic ImageCIOD
XRF ImageCIOD
RT ImageCIOD
RT DoseCIOD
RT Structure SetCIOD
RT PlanCIOD
PET 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
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
Basic Voice AudioCIOD
12-Lead ECGCIOD
General ECGCIOD
Ambulatory ECGCIOD
HemodynamicCIOD
Basic Cardiac EPCIOD
Arterial Pulse WaveformCIOD
Respiratory WaveformCIOD
General Audio WaveformCIOD
Real-Time Audio WaveformCIOD
Basic Text SRCIOD
Enhanced SRCIOD
Comprehensive SRCIOD
Key Object Selection DocumentCIOD
Mammography CAD SRCIOD
Chest CAD SRCIOD
Procedure LogCIOD
X-Ray Radiation Dose SRCIOD
Spectacle Prescription ReportCIOD
Colon CAD SRCIOD
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 Structured ReportCIOD
Performed Imaging Agent Administration SRCIOD
Rendition Selection DocumentCIOD
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 X-Ray Angiographic ImageCIOD
Enhanced X-Ray RF ImageCIOD
RT Ion PlanCIOD
RT Ion Beams Treatment RecordCIOD
SegmentationCIOD
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 OCT 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
Table CT Performed Procedure ProtocolCIOD
CT Defined Procedure ProtocolCIOD
Protocol ApprovalCIOD
Ophthalmic Optical Coherence Tomography En Face ImageCIOD
Ophthalmic Optical Coherence Tomography B-scan Volume AnalysisCIOD
Encapsulated STLCIOD
RT Physician IntentCIOD
RT Segment AnnotationCIOD
RT Radiation SetCIOD
C-Arm Photon-Electron RadiationCIOD

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

Data synced with official DICOM standard on 4 December 2019. The DICOM Standard is under continuous maintenance, and the current official version is available at http://dicom.nema.org/. DICOM Parts 3 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.

Multi-energy CT Path Sequence Attribute

Tag(0018,9379)
TypeRequired (1)
KeywordMultienergyCTPathSequence
Value Multiplicity1
Value RepresentationSequence (SQ)

Describes the paths corresponding to each energy level of a Multi-energy acquisition. Each path consists of a source (see Section C.8.2.1.1.1) and a detector (see Section C.8.2.2.1.1).

Two or more Items shall be included in this Sequence.

See also Section C.8.2.2.1 and Section C.8.2.2.2.

Section C.8.2.1.1.1

C.8.2.1.1.1 Image Type

For CT Images, Image Type (0008,0008) is specified to be Type 1.

Defined Terms for Value 3:

AXIAL

a CT Cross-sectional Image

LOCALIZER

a CT Localizer Image

Note

Cross-sectional images include transverse, coronal, sagittal and oblique images.

Image Type (0008,0008) Value 4 shall be present if Multi-energy CT Acquisition (0018,9361) has a value of YES.

Defined Terms for Value 4 for Multi-energy CT Images:

VMI

a Virtual Monoenergetic Image. Each real-world value mapped pixel represents CT Hounsfield units and is analogous to a CT image created by a monoenergetic (of a specific keV value) X-Ray beam.

MAT_SPECIFIC

a Material-Specific Image. Each real-world value mapped pixel value represents a property of a material such as attenuation, concentration or density.

MAT_REMOVED

An image with the attenuation contribution of one or more materials removed. For pixels that did not contain any of the removed material(s), the pixel values are unchanged.

MAT_FRACTIONAL

a Material-Fractional Image. Each real-world value mapped pixel represents the fraction of a voxel occupied by a material.

EFF_ATOMIC_NUM

an Effective Atomic Number Image. Each real-world value mapped pixel represents Effective Atomic Number of the materials in the voxel.

ELECTRON_DENSITY

an Electron Density Image. Each real-world value mapped pixel represents the number of electrons per unit volume or the electron density relative to water.

MAT_MODIFIED

a Material-Modified Image. CT Image where real-world value mapped pixels have been modified to highlight a certain target material (either by partially suppressing the background or by enhancing the target material), or to partially suppress the target material.

MAT_VALUE_BASED

a Value-Based Image. CT Image where real-world value mapped pixels represent a certain value for a specified material

Note

Multi-energy CT images are not necessarily DERIVED and may be ORIGINAL\PRIMARY.

When an image is created by a generic transformation an implementation-specific Value 4 may be provided.

Section C.8.2.2.1.1

C.8.2.2.1.1 Multi-energy X-Ray Source Description

Each item in the Multi-energy CT X-Ray Source Sequence (0018,9365) might describe either a constant source, a constant source with energy selective filter or one output corresponding to a specific energy of a KV switching source. The attributes will refer to a source, meaning one item in the Multi-energy CT X-Ray Source Sequence (0018,9365). The attributes use the phrase "physical X-Ray Source" when it is necessary to refer to the actual device (tube) rather than the current item.

Section C.8.2.2.1

C.8.2.2.1 Multi-energy CT X-Ray Source Macro

Attributes for the CT X-Ray Source(s).

Table C.8.2.2-2. Multi-energy CT X-Ray Source Macro Attributes

Attribute Name

Tag

Type

Attribute Description

Multi-energy CT X-Ray Source Sequence

(0018,9365)

1

X-Ray Source (see Section C.8.2.2.1.1) information.

One or more Items shall be included in this Sequence.

>X-Ray Source Index

(0018,9366)

1

Identification number of this item in the Multi-energy CT X-Ray Source Sequence.

The number shall be 1 for the first Item and increase by 1 for each subsequent Item.

>X-Ray Source ID

(0018,9367)

1

Identifier of the physical X-Ray source. This might be the serial number.

The X-Ray Source ID (0018,9367) will have the same value for different values of X-Ray Source Index (0018,9366) if a single source generates different nominal energies.

>Multi-energy Source Technique

(0018,9368)

1

Technique used to acquire Multi-energy data.

Defined Terms:

SWITCHING_SOURCE

a physical X-Ray source (tube) uses beam mode switching

CONSTANT_SOURCE

a physical X-Ray source (tube) uses a beam with constant characteristics

>Source Start DateTime

(0018,9369)

1

The date and time this X-Ray source (see Section C.8.2.2.1.1) was first used in this Multi-energy acquisition.

>Source End DateTime

(0018,936A)

1

The date and time this X-Ray source (see Section C.8.2.2.1.1) was last used in this Multi-energy acquisition.

>Switching Phase Number

(0018,936B)

1C

A number, unique within the sequence, to identify the switching phase.

Required if Multi-energy Source Technique (0018,9368) is "SWITCHING_SOURCE".

>Switching Phase Nominal Duration

(0018,936C)

3

Duration, in microseconds, that the energy is nominally in the target KV for this switching phase. I.e., the Switching Phase Nominal Duration does not include the Switching Phase Transition Duration (0018,936D).

The target KV is the value of KVP (0018,0060) for the item in the CT X-Ray Details Sequence (0018,9325) that identifies the Multi-energy CT Path Index (0018,937A) that corresponds to this X-Ray Source.

Note

Applicable if Multi-energy Source Technique (0018,9368) is "SWITCHING_SOURCE".

>Switching Phase Transition Duration

(0018,936D)

3

Duration, in microseconds, that the energy has left the target KV for this switching phase, but has not yet reached the target KV for the next phase.

The target KV is the value of KVP (0018,0060) for the item in the CT X-Ray Details Sequence (0018,9325) that identifies the Multi-energy CT Path Index (0018,937A) that corresponds to this X-Ray Source.

Note

Applicable if Multi-energy Source Technique (0018,9368) is "SWITCHING_SOURCE".

>Generator Power

(0018,1170)

3

Power in kW going into the X-Ray generator.


C.8.2.2.1.1 Multi-energy X-Ray Source Description

Each item in the Multi-energy CT X-Ray Source Sequence (0018,9365) might describe either a constant source, a constant source with energy selective filter or one output corresponding to a specific energy of a KV switching source. The attributes will refer to a source, meaning one item in the Multi-energy CT X-Ray Source Sequence (0018,9365). The attributes use the phrase "physical X-Ray Source" when it is necessary to refer to the actual device (tube) rather than the current item.

Section C.8.2.2.2

C.8.2.2.2 Multi-energy CT X-Ray Detector Macro

Attributes for the CT X-Ray Detector(s).

Table C.8.2.2-3. Multi-energy CT X-Ray Detector Macro Attributes

Attribute Name

Tag

Type

Attribute Description

Multi-energy CT X-Ray Detector Sequence

(0018,936F)

1

X-Ray Detector (see Section C.8.2.2.1.1) information.

One or more Items shall be included in this Sequence.

>X-Ray Detector Index

(0018,9370)

1

Identification number of this item in the Multi-energy CT X-Ray Detector Sequence.

The number shall be 1 for the first Item and increase by 1 for each subsequent Item.

>X-Ray Detector ID

(0018,9371)

1

Identifier of the physical X-Ray detector. This might be the serial number.

When a single detector discriminates different energies, the X-Ray Detector ID (0018,9371) will have the same value in different Items of Multi-energy CT X-Ray Detector Sequence (0018,936F).

>Multi-energy Detector Type

(0018,9372)

1

Technology used to detect multiple energies.

Defined Terms:

INTEGRATING

physical detector integrates the full X-Ray spectrum.

MULTILAYER

physical detector layers absorb different parts of the X-Ray spectrum

PHOTON_COUNTING

physical detector counts photons with energy discrimination capability

>X-Ray Detector Label

(0018,9373)

3

Label of this item in the Multi-energy CT X-Ray Detector Sequence.

Note

The label might be High, Low or some nominal bin energy.

>Nominal Max Energy

(0018,9374)

1C

Nominal maximum energy in keV of photons that are integrated/counted by the detector (see Section C.8.2.2.1.1). Due to energy resolution limits of the detector, some photons above the nominal maximum may be counted.

Required if Multi-energy Detector Type (0018,9372) is PHOTON_COUNTING. May be present otherwise.

>Nominal Min Energy

(0018,9375)

1C

Nominal minimum energy in keV of photons that are integrated/counted by the detector (see Section C.8.2.2.1.1). Due to energy resolution limits of the detector, some photons below the nominal minimum may be counted.

Required if Multi-energy Detector Type (0018,9372) is PHOTON_COUNTING. May be present otherwise.

>Effective Bin Energy

(0018,936E)

3

Energy of the heterogeneous (polychromatic) photon beam represented by this detector (see Section C.8.2.2.1.1) calculated as if it were monochromatic.

Note

E.g., this can be calculated based on the beam spectrum or derived from the attenuation of phantom measurement.


C.8.2.2.2.1 Multi-energy X-Ray Detector Description

Each item in the Multi-energy CT X-Ray Detector Sequence (0018,936F) might describe either an integrating detector or one output corresponding to a specific spectrum of a physical detector like:

  • One layer of a multi-layer detector.

  • One energy bin of a photon counting detector.

  • One energy threshold of a photon counting detector.

The sequence attribute descriptions will refer to a detector, meaning one item in the Multi-energy CT X-Ray Detector Sequence (0018,936F). The attributes use the phrase "physical detector" when it is necessary to refer to the actual device rather than the current item.