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DICOM PS3.3 2020a - Information Object Definitions​

Page 1001​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Calcium Scoring​

(0018,9352)​

3​

The calibration factors for the calcium mass score of the device. These factors​

Mass Factor Device​

 

 

incorporate the effects of​

 

 

 

 

•​KV value of the CT image​

 

 

 

 

•​machine specific corrections​

 

 

 

 

This a multi-value Attribute, the first value specifies the mass factor for a small​

 

 

 

patient size, the second value for a medium patient size and the third value for a​

 

 

 

large patient size.​

 

 

 

 

See Section C.8.2.1.1.7.​

 

>Energy Weighting​

(0018,9353)​

1C​

The weighting factor of the data from this Sequence Item.​

 

Factor​

 

 

Required if Required if Frame Type (0008,9007) Value 4 of this frame is​

 

 

 

 

 

 

ENERGY_PROP_WT. May be present otherwise.​

 

C.8.15.3.10 CT Pixel Value Transformation Macro​

Table C.8-126 specifies the Attributes of the CT Pixel Value Transformation Functional Group Macro.​

Note​

1.​This Macro is equivalent to the Modality LUT transformation in non Multi-frame IODs.​

2.​This in effect specializes the Section C.7.6.16.2.9 Pixel Value Transformation Macro.​

Table C.8-126. CT Pixel Value Transformation Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Pixel Value Transformation​

(0028,9145)​

1​ Contains the Attributes involved in the transformation of stored pixel​

Sequence​

 

 

values.​

 

 

 

Only a single Item shall be included in this Sequence.​

>Rescale Intercept​

(0028,1052)​

1​ Thevaluebinrelationshipbetweenstoredvalues(SV)andtheoutput​

 

 

 

units.​

 

 

 

Output units = m*SV + b.​

>Rescale Slope​

(0028,1053)​

1​ m in the equation specified by Rescale Intercept (0028,1052).​

>Rescale Type​

(0028,1054)​

1​ Specifies the output units of Rescale Slope (0028,1053) and Rescale​

Intercept (0028,1052).​

See Section C.11.1.1.2 for further explanation.​

If Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and​ Frame Type (0008,9007) Value 3 is not LOCALIZER, the value shall​ be HU (Hounsfield Units).​

C.8.15.3.11 CT Additional X-Ray Source Macro​

Table C.8-126b specifies the Attributes of the CT Additional X-Ray Source Macro. This Sequence may be multi-valued, depending​ on the number of additional active X-Ray sources. It defines the X-Ray source parameters beyond the basic system.​

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Page 1002​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8-126b. CT Additional X-Ray Source Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

CT Additional X-Ray Source​

(0018,9360)​

1​

Contains the Attributes defining the data acquisition in a multiple​

Sequence​

 

 

X-Ray source system beyond the primary source. The primary​

 

 

 

X-Ray source is specified in the CT X-Ray Details Sequence.​

 

 

 

One or more Items shall be included in this Sequence.​

>KVP​

(0018,0060)​

1​

Peak kilo voltage output of the X-Ray generator used.​

>X-Ray Tube Current in mA​

(0018,9330)​

1​

Nominal X-Ray tube current in milliamperes.​

>Data Collection Diameter​

(0018,0090)​

1​

The diameter in mm of the region over which data were collected.​

>Focal Spot(s)​

(0018,1190)​

1​

Used nominal size of the focal spot in mm.​

>Filter Type​

(0018,1160)​

1​

Type of filter(s) inserted into the X-Ray beam. See​

 

 

 

Section C.8.15.3.9.​

>Filter Material​

(0018,7050)​

1​

The X-Ray absorbing material used in the filter.​

>Exposure in mAs​

(0018,9332)​

1​

The exposure expressed in milliampere seconds, for example​

 

 

 

calculated from exposure time and X-Ray tube current.​

>Energy Weighting Factor​

(0018,9353)​

1C​

The weighting factor of the data from this additional source in a​

multiple energy composition image. This factor incorporates the​ effects of​

•​the specific X-Ray source and kV value​ •​examination specific characteristics.​

Required if Required if Frame Type (0008,9007) Value 4 of this​ frame is ENERGY_PROP_WT. May be present otherwise.​

C.8.15.3.12 Multi-energy CT Characteristics Macro​

This Macro specifies the Attributes for CT Image Characteristics.​

Table C.8.15.3.12-1. Multi-energy CT Characteristics Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Monoenergetic Energy​

(0018,937C)​

1C​

Single energy equivalent in keV.​

Equivalent​

 

 

Required if Image Type (0008,0008) Value 4 is EQUAL to​

 

 

 

 

 

 

VMI. May be present otherwise.​

Note​

If the Image Type Value 4 is (MAT_REMOVED,​ MAT_MODIFIED) and a VMI image was used as​ the source then this value reflects the keV value​ of the VMI image.​

DerivationAlgorithmSequence​ (0022,1612)​

3​

Software algorithm that performed the derivation.​

>Include Table 10-19 “Algorithm Identification Macro Attributes”​

 

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DICOM PS3.3 2020a - Information Object Definitions​

Page 1003​

Attribute Name​

Tag​

Type​

 

Attribute Description​

 

Performed Processing​

(0074,1212)​

3​

Parameters used to perform the derivation algorithm.​

Parameters Sequence​

 

 

 

Note​

 

 

 

 

 

 

 

 

 

 

 

 

ImplementersareencouragedtoputtheAlgorithm​

 

 

 

 

Parameters here instead of in Algorithm​

 

 

 

 

 

Parameters (0066,0032) in the Algorithm​

 

 

 

 

Identification Macro​

 

 

 

 

 

One or more items are permitted in this Sequence.​

>Include Table 10.2.1-1 “Content Item with Modifiers Macro Attributes”​

 

 

C.8.15.3.13 Multi-energy CT Processing Macro​

 

 

 

 

This Macro defines the Attributes for Multi-energy CT processing.​

 

 

 

Table C.8.15.3.13-1. Multi-energy CT Processing Macro Attributes​

 

Attribute Name​

Tag​

Type​

 

 

Attribute Description​

 

Decomposition Method​

(0018,937E)​

1​

MethodusedtodecomposetheacquiredMulti-energyCTdatainto​

 

 

 

basis data.​

 

 

 

 

 

Defined Terms:​

 

 

 

 

 

PROJECTION_BASED​The acquired projection data was fully​

 

 

 

 

 

decomposedintobasisprojectiondata(i.e.​

 

 

 

 

 

sinograms).​

 

 

 

 

IMAGE_BASED​

The acquired projection data was fully​

 

 

 

 

 

reconstructed into images before being​

 

 

 

 

 

decomposed into basis image data.​

 

 

 

HYBRID​

The acquired projection data was​

 

 

 

 

 

reconstructed using knowledge in both​

 

 

 

 

 

projection and image space to produce​

 

 

 

 

 

basis image data. Decomposition and​

 

 

 

 

 

imagereconstructionmaybeperformedin​

 

 

 

 

 

a one-step approach.​

 

 

 

 

 

Note​

 

 

 

 

 

 

1.​Basis images and basis projection data are not​

 

 

 

 

necessarily instantiated as DICOM instances.​

 

 

 

 

2.​Theremaybeadditionalprocessingsteps(e.g.linear​

 

 

 

 

combination of basis data) creating the result image.​

Decomposition Description​

(0018,937F)​

3​

Description of decomposition method​

 

Decomposition Algorithm​

(0018,9380)​

3​

Algorithm used for decomposition of the acquired data.​

Identification Sequence​

 

 

One or more Items are permitted in this Sequence.​

 

 

 

 

 

>Include Table 10-19 “Algorithm Identification Macro Attributes”​

 

 

 

Decomposition Material​

(0018,9381)​

3​

Basis materials used in the decomposition process.​

 

Sequence​

 

 

Two or more Items are permitted in this Sequence.​

 

 

 

 

 

>Material Code Sequence​

(0018,937D)​

1​

Nominal material for Multi-energy CT processing.​

 

 

 

 

Only a single Item shall be included in this Sequence.​

>>Include Table 8.8-1 “Code Sequence Macro Attributes”​

BCID 300 “Multi-energy Relevant Materials”.​

 

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Page 1004​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Material Attenuation​

(0018,9382)​

3​

Attenuation curve of the material, defined as a set of points.​

Sequence​

 

 

Two or more Items are permittedin this Sequence.​

 

 

 

 

 

 

Note​

 

 

 

Attenuation curves for non-standard materials can be​

 

 

 

generated by NIST http://physics.nist.gov/PhysRefData/​

 

 

 

Xcom/html/xcom1.html.​

>>Photon Energy​

(0018,9383)​

1​

Photon energy in keV.​

>>X-Ray Mass Attenuation​

(0018,9384)​

1​

Attenuation of this material at the specific Photon Energy​

Coefficient​

 

 

(0018,9383), normalized to material density.​

C.8.15.4 Enhanced Multi-energy CT Acquisition Module​

Table C.8.15.4-1 specifies the Attributes that describe the Multi-energy CT Acquisition technique in the Enhanced CT Image.​

Table C.8.15.4-1. Enhanced Multi-energy CT Acquisition Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Include Table C.8.2.2-2

“Multi-energy CT X-Ray Source Macro Attributes”​

 

See Section C.8.2.2.1.​

Include Table C.8.2.2-3

“Multi-energy CT X-Ray Detector Macro Attributes”​

 

See Section C.8.2.2.2.​

Include Table C.8.2.2-4

“Multi-energy CT Path Macro Attributes”​

 

See Section C.8.2.2.3.​

C.8.16 Common CT, MR and US Descriptions​

This section contains descriptions of Macros and Attributes used in Modules and Functional Group Macros that are common to the​ Enhanced CT Image, Enhanced MR Images, MR Spectroscopy and Enhanced US Volume IODs.​

C.8.16.1 Image Type and Frame Type​

ImageType(0008,0008)andassociatedImageTyperelatedAttributesprovideahighleveldescriptionofamulti-frameSOPInstance.​ These Attributes describe properties that provide key summary information to users of the SOP Instance. Image Type (0008,0008)​ contains the highest level summary of what is in the SOP Instance.​

Frame Type (0008,9007) mirrors the corresponding Image Type Attribute and applies to the frame level rather than to the image level.​

If more than one value is used by the set of frames for a given Frame Type (0008,9007) Attribute value or associated Attribute value​ then the corresponding value of Image Type (0008,0008) or associated Attribute shall contain a value of MIXED. This indicates that​ a mixed set of values exists within the multi-frame SOP Instance.​

The value MIXED shall only be used in Image Type (0008,0008) when the corresponding values for the individual frames are not​ equal. When a value of an Attribute is equal for all frames, the same value shall be used for the corresponding value of Image Type​ (0008,0008). Values 2 and 3 of Image Type (0008,0008) are an exception to the rule for MIXED: Values 2 and 3 may never have the​ value of MIXED as described in Section C.8.16.1.2 and Section C.8.16.1.3.​

Image Type (0008,0008) and Frame Type (0008,9007) shall consist of four values.​

C.8.16.1.1 Pixel Data Characteristics​

Value 1 of Image Type (0008,0008) and Frame Type (0008,9007) shall use one of the following Enumerated Values from Table C.8-​ 127.​

Value 1 of Image Type (0008,0008) and Value 1 of Frame Type (0008,9007) shall not be zero length.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 1005​

 

 

Table C.8-127. Image Type and Frame Type Value 1​

Enumerated Value Name​

Enumerated Value Description​

ORIGINAL​

An image or frame is original if its pixel data was directly reconstructed from the original data that is​

 

obtained from the sensors of the imaging equipment, Image Type (0008,0008) Value 4 is NONE, and​

 

Volume Based Calculation Technique (0008,9207) is NONE.​

 

 

Note​

 

 

1.​For MR, original data is data directly reconstructed from k-space data.​

 

 

2.​For CT, original frames are those directly reconstructed from projection data.​

DERIVED​

An image or frame is derived if its pixel data was calculated from original or other derived pixel data​

 

(i.e., it is not original).​

MIXED​

Used only as a value in Image Type (0008,0008) if frames within the SOP Instance contain different​

 

values for Value 1 in their Frame Type (0008,9007).​

C.8.16.1.2 Patient Examination Characteristics​

Value 2 for Image Type (0008,0008) and Frame Type (0008,9007) follows the standard definition and shall have the following Enu-​ merated Value from Table C.8-128.​

Value 2 of Image Type (0008,0008) and Value 2 of Frame Type (0008,9007) shall not be zero length.​

Table C.8-128. Image Type and Frame Type Value 2​

Enumerated Value Name​

Enumerated Value Description​

PRIMARY​

See Section C.7.6.1.1.2​

C.8.16.1.3 Image Flavor​

Value 3 is an overall representation of the image type. This value may be a summary of several other Attributes or a duplication of​ oneoftheotherAttributestoindicatethemostimportantaspectofthisimage.Value3ImageFlavoristobeusedwithValue4Derived​ Pixel Contrast to indicate the nature of the image set.​

Note​

For example Value 3 = DIFFUSION together with Value 4 = NONE indicates that the image set was originally collected for​ DIFFUSION.​

If Value 3 = DIFFUSION together with Value 4 = DIFFUSION this indicates that the object contains DIFFUSION weighted​ post processed images.​

Value 3 of Image Type (0008,0008) shall not be zero length.​

Value3ofFrameType(0008,9007)mayhavethesamevalueasfoundinValue3ofImageType(0008,0008),ormayhaveadifferent​ value.​

The Attribute value may not be MIXED as this value needs to be a summary of the primary purpose of the images, whether the frames​ have the same value or not.​

Table C.8-129 specifies the Defined Terms for Value 3 for Image Type (0008,0008) and Frame Type (0008,9007) that are common​ to CT and MR. Additional Defined Terms are defined in the modality-specific Module and Macro definitions.​

Table C.8-129. Image Type and Frame Type Value 3 Common​

Defined Term Name​

Defined Term Description​

ANGIO​

Collected for the purpose of angiography​

- Standard -​

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