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Page 996​

 

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Reconstruction​

(0018,9322)​

1C​

Physical distance in the patient between the center of each reconstructed pixel,​

Pixel Spacing​

 

 

specifiedbyanumericpair-adjacentrowspacing(delimiter)adjacentcolumnspacing​

 

 

 

in mm. See Section 10.7.1.3 for further explanation of the value order.​

 

 

 

Note​

 

 

 

The values of Reconstruction Pixel Spacing (0018,9322) will equal the​

 

 

 

correspondingvalues ofPixelSpacing(0028,0030)unlessthe pixeldatahas​

 

 

 

beenpost-processedtochangethepixelsizeafterreconstructionandbefore​

 

 

 

storage.​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​

 

 

 

present otherwise.​

>Reconstruction​

(0018,9319)​

1C​ Angle (in degrees) over which the data from which the frame was reconstructed was​

Angle​

 

 

collected, where 360 degrees signifies a complete revolution of the source around the​

 

 

 

gantry orbit. It is possible, in the case of over-scanning that the Reconstruction Angle​

 

 

 

is greater than 360 degrees.​

 

 

 

Shall be 0 if Acquisition Type (0018,9302) is CONSTANT_ANGLE.​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​

 

 

 

present otherwise.​

>Image Filter​

(0018,9320)​

1C​

A label describing the filter applied to the reconstructed image after the original​

reconstruction has been completed.​ Note​

WhenFrameType(0008,9007)Value1ofthisframeisDERIVEDandFrame​

Type (0008,9007) Value 4 is FILTERED the type of filtration is described in​

Derivation Image Macro.​

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL.​

C.8.15.3.8 CT Exposure Macro​

Table C.8-124 specifies the Attributes of the CT Exposure Functional Group Macro.​

Table C.8-124. CT Exposure Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

CT Exposure Sequence​

(0018,9321)​

1​

Contains the Attributes defining exposure information.​

 

 

 

If Multi-energy CT Acquisition (0018,9361) is NO or is absent, only a single​

 

 

 

Item shall be included in this Sequence.​

 

 

 

If Multi-energy CT Acquisition (0018,9361) is YES, one or more Items shall​

 

 

 

be included in this Sequence.​

>Referenced Source​

(0018,9377)​

1C​

References the X-Ray Source Index (0018,9366) in the Multi-energy CT​

Index​

 

 

SourceSequence(0018,9365)forwhichexposuredetailsarespecifiedhere.​

Note​

This Attribute may contain multiple values if this Item summarizes​ thetotalexposurefrommultiplesourcese.g.,frommultipleswitching​ phases from a switching source.​

Required if Multi-energy CT Acquisition (0018,9361) is YES.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 997​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Exposure Time in ms​

(0018,9328)​

1C​

Duration of exposure for this frame in milliseconds. If Acquisition Type​

 

 

 

(0018,9302) equals SPIRAL the duration of the exposure time for this frame​

 

 

 

shall be Revolution Time (0018,9305) divided by the Spiral Pitch Factor​

 

 

 

(0018,9311). See Section C.8.15.3.8.1.​

 

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL, or​

 

 

 

if Image Type (0008,0008) Value 1 is ORIGINAL and Multi-energy CT​

 

 

 

Acquisition (0018,9361) is YES. May be present otherwise.​

 

>X-Ray Tube Current in​

(0018,9330)​

1C​

Nominal X-Ray tube current in milliamperes.​

 

mA​

 

 

Required if Frame Type(0008,9007) Value 1 of this frame isORIGINAL. May​

 

 

 

 

 

 

be present otherwise.​

 

>Exposure in mAs​

(0018,9332)​

1C​

Theexposureexpressedinmilliampereseconds,forexamplecalculatedfrom​

 

 

 

exposure time and X-Ray tube current.​

 

 

 

 

Required if Frame Type(0008,9007) Value 1 of this frame isORIGINAL. May​

 

 

 

be present otherwise.​

 

>Exposure Modulation​

(0018,9323)​

1C​

A label describing the type of exposure modulation used for the purpose of​

Type​

 

 

limiting the dose.​

 

 

 

 

Defined Terms:​

 

 

 

 

NONE​

 

 

 

 

Required if Frame Type(0008,9007) Value 1 of this frame isORIGINAL. May​

 

 

 

be present otherwise.​

 

>EstimatedDoseSaving​ (0018,9324)​

2C​

A percent value of dose saving due to the use of Exposure Modulation Type​

 

 

 

(0018,9323). A negative percent value of dose savings reflects an increase​

 

 

 

of exposure.​

 

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and​

 

 

 

Exposure Modulation Type (0018,9323) is not equal to NONE.​

 

 

 

 

Otherwise may be present if Frame Type (0008,9007) Value 1 of this frame​

 

 

 

is DERIVED and Exposure Modulation Type (0018,9323) is not equal to​

 

 

 

NONE.​

 

>CTDIvol​

(0018,9345)​

2C​

Computed Tomography Dose Index (CTDIvol), in mGy according to [IEC​

 

 

 

60601-2-44] (Clause 29.1.103.4), The Volume CTDIvol. It describes the​

 

 

 

average dose for this frame for the selected CT conditions of operation.​

 

 

 

Required if Frame Type(0008,9007) Value 1 of this frame isORIGINAL. May​

 

 

 

be present otherwise.​

 

>CTDI Phantom Type​

(0018,9346)​

3​

The type of phantom used for CTDI measurement according to [IEC​

Code Sequence​

 

 

60601-2-44].​

 

 

 

 

Only a single Item is permitted in this Sequence.​

 

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

DCID 4052 “Phantom Devices”.​

 

Attributes”​

 

 

 

 

>Water Equivalent​

(0018,1271)​

3​

Thediameter,inmm,ofacylinderofwaterhavingthesameX-Rayattenuation​

Diameter​

 

 

asthe patientforthis reconstructed slice(e.g.,asdescribedin [AAPM Report​

 

 

 

220]).​

 

>Water Equivalent​

(0018,1272)​

1C​

The method of calculation of Water Equivalent Diameter (0018,1271).​

Diameter Calculation​

 

 

Required if Water Equivalent Diameter (0018,1271) is present.​

 

Method Code Sequence​

 

 

 

Only a single Item is permitted in this Sequence.​

- Standard -​

Page 998​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

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

DCID 10024 “Water Equivalent Diameter Method”.​

Attributes”​

 

 

 

>ImageandFluoroscopy​ (0018,115E)​

3​

X-Ray dose, measured in dGy*cm*cm, to which the patient was exposed for​

Area Dose Product​

 

 

theacquisitionoftheentireIrradiationEventfromwhichthisimageandframe​

was reconstructed.​ Note​

1.​All of the images and frames reconstructed from the same​ Irradiation Event will have the same value for this Attribute,​ which is the total for the Irradiation Event, which is repeated in​ eachimageorframe,regardlessofwhetherornottheIrradiation​ Event UID (0008,3010) is present with a value in the Irradiation​ Event Identification Macro. I.e., the values for each image or​ frame should not be summed. The sum of the area dose​ products for each Irradiation Event may not result in the total​ area dose product to which the patient was exposed.​

2.​This may be an estimated value based on assumptions about​ the patient’s body size and habitus.​

3.​This value is required by [IEC 60601-2-63].​

Note​

ThedosethatapatientreceivesinagivenproceduremaybereportedinoneormoreinstancesoftheRadiationDoseReport​ SOP Class using TID 10011 “CT Radiation Dose”.​

C.8.15.3.8.1 Exposure Time in ms Attribute (Informative)​

An example of how the value of Exposure Time in ms (0018,9328) can be calculated:​

The Exposure Time Texposuretime of a volume shall be the time of the X-Ray radiation in position with this volume. It depends on the​ travel speed and the total collimation width.​

Texposuretime of the volume represented by a distinguished frame of a Spiral Scan can be calculated as follows:​

Texposuretime = N x S / Vtravelspeed​

CTpitchfactor = DD / N x S​

Vtravelspeed = DD / Trevolutiontime​

From this the exposure time can be derived:​

Texposuretime = N x S x Trevolutiontime / DD = Trevolutiontime / CTpitchfactor​

Legend:​

DD = Table Feed per Rotation (0018,9310) in mm distance moved by the patient support in the z direction per 360° revolution in​ Spiral scanning​

S = collimation of a single slice in mm​

N = number slices​

N x S = Total Collimation Width (0018,9307) in mm​

Vtravelspeed = Table Speed (0018,9309) in mm/second, travel speed of the patient table​

Trevolutiontime = Revolution time (0018,9305) in seconds​

- Standard -​

DICOM PS3.3 2020a - Information Object Definitions​

Page 999​

CTpitchfactor = Spiral Pitch Factor (0018,9311)​

C.8.15.3.9 CT X-Ray Details Macro​

Table C.8-125 specifies the Attributes of the CT X-Ray Details Functional Group Macro.​

Table C.8-125. CT X-Ray Details Sequence Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

CT X-Ray Details​

(0018,9325)​

1​

Contains the Attributes defining the X-Ray information.​

Sequence​

 

 

If Multi-energy CT Acquisition (0018,9361) is NO or is absent, only a single Item​

 

 

 

 

 

 

shall be included in this Sequence.​

 

 

 

If Multi-energy CT Acquisition (0018,9361) is YES, one or more Items shall be​

 

 

 

included in this Sequence.​

>Referenced Path​

(0018,9378)​

1C​

ReferencestheX-RayPathIndex(0018,937A)intheMulti-energyCTPathSequence​

Index​

 

 

(0018,9379) for this exposure.​

Note​

This attribute may contain multiple values if this item describes multiple​ paths.​

Required if Multi-energy CT Acquisition (0018,9361) is YES.​

>KVP​

(0018,0060)​ 1C​ Nominal peak kilo voltage output of the X-Ray generator used.​

If Multi-energy Source Technique (0018,9368) in Multi-energy CT X-Ray Source​ Sequence(0018,9365)(ofthereferencedMulti-energyCTPathIndex(0018,937A))​ is “SWITCHING_SOURCE”, this value is the nominal peak value for a switching​ phase. The switching phase is identified by the value of X-Ray Source Index​ (0018,9366) in the Multi-energy CT Path Sequence (0018,9379) corresponding to​ the value of Referenced Path Index (0018,9378) in this Sequence.​

 

Due to limitations of the generating hardware the actual voltage may not reach the​

 

nominal peak value.​

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​

 

present otherwise.​

>Focal Spot(s)​

(0018,1190)​ 1C​ Used nominal size of the focal spot in mm. The Attribute may only have one or two​

 

values, for devices with variable focal spot, small dimension followed by large​

 

dimension​

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​

 

present otherwise.​

- Standard -​

Page 1000​

 

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Filter Type​

(0018,1160)​

1C​

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

 

 

 

Defined Terms:​

WEDGE​

BUTTERFLY​

MULTIPLE​

FLAT​

SHAPED​

NONE​

Note​

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

BUTTERFLY+WEDGE.​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be​

 

 

 

present otherwise.​

>Filter Material​

(0018,7050)​

1C​

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

 

 

 

Defined Terms:​

 

 

 

MOLYBDENUM​

 

 

 

ALUMINUM​

 

 

 

COPPER​

 

 

 

RHODIUM​

 

 

 

NIOBIUM​

 

 

 

EUROPIUM​

 

 

 

LEAD​

 

 

 

MIXED​

 

 

 

Note​

 

 

 

MIXED may be used to indicate a filter type of complex composition for​

 

 

 

which listing the individual materials would be excessive or undesirable;​

 

 

 

it is not intended to mean "unknown".​

 

 

 

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and the​

 

 

 

value of Filter Type (0018,1160) is other than NONE. May be present otherwise.​

>Calcium Scoring​

(0018,9351)​

3​

The calibration factor for the calcium mass score. These factors incorporate the​

Mass Factor Patient​

 

 

effects of​

•​KV value of the CT image​ •​the patient size.​ •​machine specific corrections​ See Section C.8.2.1.1.7.​

- Standard -​

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