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DICOM PS3.3 2020a - Information Object Definitions​

Page 701​

Attribute Name​

Tag​

Type​

Attribute Description​

 

X-Ray Tube Current in µA​

(0018,8151)​

3​ X-Ray Tube Current in µA.​

 

Exposure Time​

(0018,1150)​

3​ Duration of X-Ray exposure in msec.​

 

Exposure Time in µS​

(0018,8150)​

3​ Duration of X-Ray exposure in µsec.​

 

Exposure​

(0018,1152)​

3​ The exposure expressed in mAs, for example calculated from​

 

 

 

Exposure Time and X-Ray Tube Current.​

 

Exposure in µAs​

(0018,1153)​

3​ The exposure expressed in µAs, for example calculated from​

 

 

 

Exposure Time and X-Ray Tube Current.​

 

Exposure Control Mode​

(0018,7060)​

3​ Type of exposure control.​

 

 

 

 

Defined Terms:​

 

 

 

 

MANUAL​

 

 

 

 

AUTOMATIC​

 

Exposure Control Mode​

(0018,7062)​

3​ Text description of the mechanism of exposure control.​

Description​

 

 

May describe the number and type of exposure sensors or​

 

 

 

 

 

 

position of the sensitive area of the imaging detector.​

Exposure Status​

(0018,7064)​

3​ Whether the exposure was normally completed or not.​

 

 

 

Defined Terms:​

 

 

 

 

NORMAL​

 

 

 

 

ABORTED​

 

Phototimer Setting​

(0018,7065)​

3​ Nominalpercentagephototimersetting,whereamorepositive​

 

 

 

value indicates greater exposure and a more negative value​

 

 

 

indicates less exposure.​

 

Focal Spot(s)​

(0018,1190)​

3​ Nominal focal spot size in mm used to acquire this image.​

Anode Target Material​

(0018,1191)​

3​ The primary material in the anode of the X-Ray source.​

 

 

 

Defined Terms:​

 

 

 

 

TUNGSTEN​

 

 

 

 

MOLYBDENUM​

 

 

 

 

RHODIUM​

 

Rectification Type​

(0018,1156)​

3​ Type of rectification used in the X-Ray generator.​

 

 

 

 

Defined Terms:​

 

 

 

 

SINGLE PHASE​

 

 

 

 

THREE PHASE​

 

 

 

 

CONSTPOTENTIAL​

 

Generator ID​

(0018,1005)​

3​ Identifier of the generator​

 

C.8.7.10 X-Ray Filtration Module​

This Module describes the Attributes related to the filtration of X-Rays during the acquisition of an X-Ray image.​

Table C.8-35. X-Ray Filtration Module Attributes​

Attribute Name​ Tag​ Type​ Attribute Description​

Include Table C.8-35a “X-Ray Filtration Macro Attributes”​

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Page 702​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8-35a. X-Ray Filtration Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Filter Type​

(0018,1160)​

3​ Type of filter(s) inserted into the X-Ray beam (e.g., wedges).​

 

 

 

Defined Terms:​

 

 

 

STRIP​

 

 

 

WEDGE​

 

 

 

BUTTERFLY​

 

 

 

MULTIPLE​

 

 

 

FLAT​

 

 

 

NONE​

 

 

 

Note​

 

 

 

Multiple type of filters can be expressed by a combination, e.g.,​

 

 

 

BUTTERFLY+WEDGE.​

Filter Material​

(0018,7050)​

3​ The X-Ray absorbing material used in the filter. May be multi-valued.​

 

 

 

Defined Terms:​

 

 

 

MOLYBDENUM​

 

 

 

ALUMINUM​

 

 

 

COPPER​

 

 

 

RHODIUM​

 

 

 

NIOBIUM​

 

 

 

EUROPIUM​

 

 

 

LEAD​

Filter Thickness Minimum​

(0018,7052)​

3​ The minimum thickness in mm of the X-Ray absorbing material used in​

 

 

 

thefilters.Maybemulti-valued,withvaluescorrespondingtotherespective​

 

 

 

values in Filter Material (0018,7050).​

Filter Thickness Maximum​

(0018,7054)​

3​ The maximum thickness in mm of the X-Ray absorbing material used in​

 

 

 

thefilters.Maybemulti-valued,withvaluescorrespondingtotherespective​

 

 

 

values in Filter Material (0018,7050).​

Filter Beam Path Length​

(0018,7056)​

3​ The minimum length (in mm) of the X-Ray beam path in the Filter Material​

Minimum​

 

 

that is not blocked by collimation. May be multi-valued, with values​

 

 

 

corresponding to the respective values in Filter Material (0018,7050).​

Filter Beam Path Length​

(0018,7058)​

3​ The maximum length (in mm) of the X-Ray beam path in the Filter Material​

Maximum​

 

 

that is not blocked by collimation. May be multi-valued, with values​

 

 

 

corresponding to the respective values in Filter Material (0018,7050).​

C.8.7.11 X-Ray Grid Module​

This Module describes the Attributes related to the use of a grid to reduce scatter of X-Rays during the acquisition of an X-Ray image.​

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DICOM PS3.3 2020a - Information Object Definitions​ Page 703​

Table C.8-36. X-Ray Grid Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Grid​

(0018,1166)​

3​

Identifies the grid. May be multi-valued.​

 

 

 

Defined Terms:​

 

 

 

FIXED​

 

 

 

FOCUSED​

 

 

 

RECIPROCATING​

 

 

 

PARALLEL​

 

 

 

CROSSED​

 

 

 

NONE​

Include Table C.8-36b “X-Ray Grid Description Macro Attributes”​

Table C.8-36b. X-Ray Grid Description Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Grid Absorbing Material​

(0018,7040)​

3​ The X-Ray absorbing material used in the grid.​

Grid Spacing Material​

(0018,7041)​

3​ The spacing material used in the grid.​

Grid Thickness​

(0018,7042)​

3​ The thickness in mm of the X-Ray absorbing material used in​

 

 

 

the grid.​

Grid Pitch​

(0018,7044)​

3​ The pitch in mm of the X-Ray absorbing material used in the​

 

 

 

grid.​

Grid Aspect Ratio​

(0018,7046)​

3​ Ratio of the vertical spacing and horizontal spacing of the​

 

 

 

X-Ray absorbing material used in the grid. Specified by a pair​

 

 

 

of integer values where the first value is the vertical size, and​

 

 

 

the second value is the horizontal size.​

Grid Period​

(0018,7048)​

3​ Period in mSec of reciprocation cycle.​

 

 

 

Only meaningful if a value of Grid (0018,1166) is​

 

 

 

RECIPROCATING.​

Grid Focal Distance​

(0018,704C)​

3​ Focal distance in mm of a FOCUSED grid.​

Grid ID​

(0018,1006)​

3​ Identifier of the grid​

C.8.8 Radiotherapy Modules​

This Section describes Radiotherapy-specific Modules.​

Modules defined here make reference to "IEC" coordinate systems and standards. These standards are defined in IEC Standard​ 61217, "Radiotherapy Equipment - Coordinates, Movements and Scales" (Reference CEI/IEC 61217: 1996).​

Note​

IEC document 62C/269/CDV "Amendment to IEC 61217: Radiotherapy Equipment - Coordinates, movements and scales"​ alsodefinesaPatient-BasedCoordinateSystem,andspecifiestherelationshipbetweentheDICOMPatient-BasedCoordinate​ System (see Section C.7.6.2.1.1) and the IEC PATIENT Coordinate System. Rotating the IEC PATIENT Coordinate System​ described in IEC 62C/269/CDV (1999) by 90 degrees counter-clockwise (in the negative direction) about the x-axis yields​

the DICOM Patient-Based Coordinate System, i.e., (XDICOM, YDICOM, ZDICOM) = (XIEC, -ZIEC, YIEC). Refer to the latest IEC​ documentation for the current definition of the IEC PATIENT Coordinate System.​

Many of the dosimetry concepts referred to in this document can be found in [ICRU Report 50].​

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Page 704​

DICOM PS3.3 2020a - Information Object Definitions​

C.8.8.1 RT Series Module​

There exist significant differences in the manner in which RT objects as compared to diagnostic objects. An RT object can be one of​ several types, and a series of a given object type may be created over a temporal span of several weeks. The RT Series Module has​ been created to satisfy the requirements of the standard DICOM Query/Retrieve model while including only those Attributes relevant​ to the identification and selection of radiotherapy objects.​

Table C.8-37. RT Series Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Modality​

(0008,0060)​

1​

Type of equipment that originally acquired the data.​

 

 

 

Enumerated Values:​

 

 

 

RTIMAGE​RT Image​

 

 

 

RTDOSE​ RT Dose​

 

 

 

RTSTRUCT​RT Structure Set​

 

 

 

RTPLAN​ RT Plan​

 

 

 

RTRECORD​RT Treatment Record​

 

 

 

See Section C.8.8.1.1.​

Series Instance UID​

(0020,000E)​

1​

Unique identifier of the Series.​

Series Number​

(0020,0011)​

2​

A number that identifies this Series.​

Series Date​

(0008,0021)​

3​

Date the Series started.​

Series Time​

(0008,0031)​

3​

Time the Series started.​

Series Description​

(0008,103E)​

3​

Description of the Series.​

Series Description Code​

(0008,103F)​

3​

A coded description of the Series.​

Sequence​

 

 

Only a single Item is permitted in this Sequence.​

 

 

 

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

 

No Baseline CID is defined.​

Operators' Name​

(0008,1070)​

2​

Name(s) of the operator(s) supporting the Series.​

Operator Identification​

(0008,1072)​

3​

Identificationoftheoperator(s)supportingtheSeries.​

Sequence​

 

 

One or more Items may be present in this Sequence.​

 

 

 

If more than one Item, the number and order shall​

 

 

 

correspond to the value of Operators' Name​

 

 

 

(0008,1070), if present.​

>Include Table 10-1 “Person Identification Macro Attributes Description”​

 

Referenced Performed​

(0008,1111)​

3​

Uniquely identifies the Performed Procedure Step​

Procedure Step Sequence​

 

 

SOP Instance to which the Series is related.​

 

 

 

One or more Items are permitted in this Sequence.​

>Include Table 10-11 “SOP Instance Reference Macro Attributes”​

 

Request Attributes Sequence​

(0040,0275)​

3​

Sequence that contains Attributes from the Imaging​

 

 

 

Service Request.​

 

 

 

One or more Items are permitted in this Sequence.​

>Include Table 10-9 “Request Attributes Macro Attributes”​

 

No Baseline CID is defined.​

Include Table 10-16 “Performed Procedure Step Summary Macro Attributes”​No Baseline CID is defined.​

C.8.8.1.1 Modality​

The Enumerated Value for Modality (0008,0060) shall determined by the IOD.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 705​

Enumerated Values if RT Image IOD:​

RTIMAGE​

Enumerated Values if RT Dose IOD:​

RTDOSE​

Enumerated Values if RT Structure Set IOD:​

RTSTRUCT​

Enumerated Values if RT Plan IOD or RT Ion Plan IOD:​

RTPLAN​

Enumerated Values if RT Beams Treatment Record IOD, RT Ion Beams Treatment Record IOD, RT Brachy Treatment Record IOD,​ or RT Treatment Summary Record IOD:​

RTRECORD​

Note​

DICOM specifies that a given Series shall contain objects of only one Modality, and shall be created by a single device (de-​ scribedintheGeneralEquipmentModule).However,ingeneraltheremaybemanySeriesdefinedforagivenmodality/device​ pair.NotethataradiotherapySeriesisgenerallycreatedoveranextendedtimeinterval(unlikeinradiology,whereallimages​ in an image Series are generally created together).​

C.8.8.2 RT Image Module​

TableC.8-38containsAttributesthatdescribeRT-specificcharacteristicsofaprojectionimage.TheimagedescribedbytheseAttributes​ must be a radiotherapy image acquired or calculated using a conical imaging geometry.​

Table C.8-38. RT Image Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Samples per Pixel​

(0028,0002)​

1​ Number of samples (planes) in this image. See Section C.8.8.2.6.1 for​

 

 

 

specialization.​

Photometric Interpretation​

(0028,0004)​

1​ Specifies the intended interpretation of the pixel data. See​

 

 

 

Section C.8.8.2.6.2 for specialization.​

Bits Allocated​

(0028,0100)​

1​ Number of bits allocated for each pixel sample. Each sample shall have​

 

 

 

the same number of bits allocated. See Section C.8.8.2.6.3 for​

 

 

 

specialization.​

Bits Stored​

(0028,0101)​

1​ Number of bits stored for each pixel sample. Each sample shall have​

 

 

 

the same number of bits stored. See Section C.8.8.2.6.4 for​

 

 

 

specialization.​

High Bit​

(0028,0102)​

1​ Most significant bit for each pixel sample. Each sample shall have the​

 

 

 

same high bit. See Section C.8.8.2.6.5 for specialization.​

Pixel Representation​

(0028,0103)​

1​ Data representation of the pixel samples. Each sample shall have the​

 

 

 

same pixel representation. See Section C.8.8.2.6.6 for specialization.​

Pixel Intensity Relationship​

(0028,1040)​

3​ The relationship between the Pixel sample values and the X-Ray beam​

 

 

 

intensity.​

See Section C.8.19.6.4.1.1.​

- Standard -​

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