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DICOM PS3.3 2020a - Information Object Definitions​

Page 621​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Rescale Intercept​

(0028,1052)​

1​

Thevaluebinrelationshipbetweenstoredvalues(SV)andtheoutputunits.​

 

 

 

Output units = m*SV+b​

 

 

 

 

If Image Type (0008,0008) Value 1 is ORIGINAL and Value 3 is not​

 

 

 

LOCALIZER,andMulti-energyCTAcquisition(0018,9361)iseitherabsent​

 

 

 

or NO, output units shall be Hounsfield Units (HU).​

 

Rescale Slope​

(0028,1053)​

1​

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

 

Rescale Type​

(0028,1054)​

1C​

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

 

 

 

Intercept (0028,1052).​

 

 

 

 

See Section C.11.1.1.2 for Defined Terms and further explanation.​

 

 

 

Required if the Rescale Type is not HU (Hounsfield Units), or Multi-energy​

 

 

 

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

KVP​

(0018,0060)​

2​

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

 

 

 

 

Shall be empty if this Attribute is present in Multi-energy CT Acquisition​

 

 

 

Sequence (0018,9362).​

 

Acquisition Number​

(0020,0012)​

2​

A number identifying the single continuous gathering of data over a period​

 

 

 

of time that resulted in this image​

 

Scan Options​

(0018,0022)​

3​

Parameters of scanning sequence.​

 

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

DataCollectionDiameter​

(0018,0090)​

3​

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

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Data Collection Center​

(0018,9313)​

3​

The x, y, and z coordinates (in the Patient-Based Coordinate System) in​

(Patient)​

 

 

mm of the center of the region in which data were collected. See​

 

 

 

Section C.8.15.3.6.1.​

 

ReconstructionDiameter​

(0018,1100)​

3​

Diameter in mm of the region from within which data were used in creating​

 

 

 

the reconstruction of the image. Data may exist outside this region and​

 

 

 

portions of the patient may exist outside this region.​

 

The diameter defines a circular region that is entirely contained within the​ encoded Pixel Data (7FE0,0010), unless the encoded image has been​ cropped after reconstruction.​

Note​

If not cropped or padded, for square images with square pixels,​ both values of Pixel Spacing (0028,0030) will be equal and equal​ to Reconstruction Diameter (0018,1100) / Rows (0028,0010) and​ Reconstruction Diameter (0018,1100) / Columns (0028,0011).​

- Standard -​

Page 622​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Reconstruction Target​

(0018,9318)​

3​ The x, y, and z coordinates (in the Patient-Based Coordinate System) of​

Center (Patient)​

 

 

thereconstructioncentertargetpointasusedforreconstructioninmm.See​

 

 

 

Section C.8.15.3.6.1.​

 

 

 

Note​

 

 

 

If the reconstructed image is not magnified or panned the value​

 

 

 

correspondswiththeDataCollectionCenter(Patient)(0018,9313)​

 

 

 

Attribute.​

Distance Source to​

(0018,1110)​

3​ Distance in mm from source to detector center.​

Detector​

 

 

Note​

 

 

 

 

 

 

This value is traditionally referred to as Source Image Receptor​

 

 

 

Distance (SID).​

 

 

 

Shall not be present if this Attribute is present in Multi-energy CT​

 

 

 

Acquisition Sequence (0018,9362) and the value of this Attribute​

 

 

 

is not the same in all Items of the Multi-energy CT Acquisition​

 

 

 

Sequence (0018,9362).​

Distance Source to​

(0018,1111)​

3​ Distance in mm from source to isocenter (center of field of view).​

Patient​

 

 

Note​

 

 

 

 

 

 

This value is traditionally referred to as Source Object Distance​

 

 

 

(SOD).​

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Gantry/Detector Tilt​

(0018,1120)​

3​ Nominal angle of tilt in degrees of the scanning gantry. Not intended for​

 

 

 

mathematical computations.​

Table Height​

(0018,1130)​

3​ The distance in mm of the top of the patient table to the center of rotation;​

 

 

 

below the center is positive.​

Rotation Direction​

(0018,1140)​

3​ Direction of rotation of the source when relevant, about nearest principal​

 

 

 

axis of equipment.​

 

 

 

Enumerated Values:​

 

 

 

CW​clockwise​

 

 

 

CC​counter clockwise​

Exposure Time​

(0018,1150)​

3​ Time of X-Ray exposure in msec.​

 

 

 

If Acquisition Type (0018,9302) equals SPIRAL, the value of this Attribute​

 

 

 

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

 

 

 

(0018,9311). See Section C.8.15.3.8.1 and Section C.8.15.3.2.1.​

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

X-Ray Tube Current​

(0018,1151)​

3​ X-Ray Tube Current in mA.​

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 623​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Exposure​

(0018,1152)​

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

 

 

 

Time and X-Ray Tube Current.​

 

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Exposure in µAs​

(0018,1153)​

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

 

 

 

Time and X-Ray Tube Current.​

 

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Filter Type​

(0018,1160)​

3​ Label for the type of filter inserted into the X-Ray beam.​

 

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Generator Power​

(0018,1170)​

3​ Power in kW to the X-Ray generator.​

 

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Focal Spot(s)​

(0018,1190)​

3​ Size of the focal spot in mm. For devices with variable focal spot or multiple​

 

 

 

focal spots, small dimension followed by large dimension.​

 

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Convolution Kernel​

(0018,1210)​

3​ A label describing the convolution kernel or algorithm used to reconstruct​

 

 

 

the data​

 

Revolution Time​

(0018,9305)​

3​ The time in seconds of a complete revolution of the source around the​

 

 

 

gantry orbit.​

 

Single Collimation Width​

(0018,9306)​

3​ The width of a single row of acquired data (in mm).​

 

 

 

 

Note​

 

 

 

 

Adjacentphysicaldetectorrowsmayhavebeencombinedtoform​

 

 

 

a single effective acquisition row.​

 

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Total Collimation Width​

(0018,9307)​

3​ The width of the total collimation (in mm) over the area of active X-Ray​

 

 

 

detection.​

 

 

 

 

Note​

 

 

 

 

This will be equal the number of effective detector rows multiplied​

 

 

 

by single collimation width.​

 

 

 

 

ShallnotbepresentifthisAttributeispresentinMulti-energyCTAcquisition​

 

 

 

Sequence (0018,9362) and the value of this Attribute is not the same in all​

 

 

 

Items of the Multi-energy CT Acquisition Sequence (0018,9362).​

Table Speed​

(0018,9309)​

3​ Thedistanceinmmthatthetablemovesinonesecondduringthegathering​

 

 

 

of data that resulted in this image.​

 

- Standard -​

Page 624​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Table Feed per Rotation​

(0018,9310)​

3​

Motion of the table (in mm) during a complete revolution of the source​

 

 

 

around the gantry orbit.​

Spiral Pitch Factor​

(0018,9311)​

3​

Ratio of the Table Feed per Rotation (0018,9310) to the Total Collimation​

 

 

 

Width (0018,9307).​

Exposure Modulation​

(0018,9323)​

3​

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

Type​

 

 

of limiting the dose.​

 

 

 

Defined Terms:​

 

 

 

NONE​

Estimated Dose Saving​

(0018,9324)​

3​

ApercentvalueofdosesavingduetotheuseofExposureModulationType​

 

 

 

(0018,9323).Anegativepercentvalueofdosesavingsreflectsanincrease​

 

 

 

of exposure.​

CTDIvol​

(0018,9345)​

3​

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

 

 

 

60601-2-44, Ed.2.1 (Clause 29.1.103.4), The Volume CTDIvol. It describes​

 

 

 

theaveragedoseforthisimagefortheselectedCTconditionsofoperation.​

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 Attributes”​DCID 4052 “Phantom Devices”.​

Water Equivalent​

(0018,1271)​

3​

The diameter, in mm, of a cylinder of water having the same X-Ray​

Diameter​

 

 

attenuation as the patient for this reconstructed slice (e.g., as described in​

 

 

 

[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.​

>Include Table 8.8-1 “Code Sequence Macro Attributes”​DCID 10024 “Water Equivalent Diameter Method”.​

Image and Fluoroscopy​

(0018,115E)​

3​

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

Area Dose Product​

 

 

for the acquisition of the entire Irradiation Event from which this image was​

reconstructed.​

Note​

1.​All of the images reconstructed from the same Irradiation​ Event will have the same value for this Attribute, which is the​ totalfortheIrradiationEvent,whichisrepeatedineachimage,​ regardless of whether or not the Irradiation Event UID​ (0008,3010) is present with a value in the Multi-frame​ DimensionModule.I.e.,thevaluesforeachimageshouldnot​ besummed.Thesumoftheareadoseproductsofallencoded​ IrradiationEventsmaynotresultinthetotalareadoseproduct​ to which the patient was exposed.​

2.​Thismaybeanestimatedvaluebasedonassumptionsabout​ the Patient’s body size and habitus.​

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

Include Table 10-7 “General Anatomy Optional Macro​ Defined CID for the Anatomic Region Sequence is CID 4030 “CT, MR and​ Attributes”​ PET Anatomy Imaged”.​

IncludeTable10-25“OptionalViewandSliceProgression​

Direction Macro Attributes”​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 625​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Calcium Scoring Mass​

(0018,9351)​

3​

Thecalibrationfactorforthecalciummassscore.Thesefactorsincorporate​

Factor Patient​

 

 

the effects of​

 

 

 

 

•​KV value of the CT image​

 

 

 

 

•​the patient size.​

 

 

 

 

•​machine specific corrections​

 

 

 

 

See Section C.8.2.1.1.7.​

 

Calcium Scoring Mass​

(0018,9352)​

3​

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

Factor Device​

 

 

factors 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.​

 

EnergyWeightingFactor​

(0018,9353)​

1C​

Theweightingfactorofthedatafromtheprimarysourceinamultipleenergy​

 

 

 

composition image. This factor incorporates the effects of​

 

 

 

 

•​the specific X-Ray source and kV value​

 

 

 

 

•​examination specific characteristics.​

 

 

 

 

Required if one Derivation Code Sequence (0008,9215) Item value is​

 

 

 

(113097, DCM, "Multi-energy proportional weighting"). May be present​

 

 

 

otherwise.​

 

CT Additional X-Ray​

(0018,9360)​

3​

ContainstheAttributesdescribingadditionalacquisitionparametersbeyond​

Source Sequence​

 

 

the primary source in a multiple X-Ray source system or a multi-energy​

 

 

 

acquisition.TheprimaryX-RaysourceisspecifiedinotherAttributesofthis​

 

 

 

Module.​

 

 

 

 

One or more Items are permitted in this Sequence.​

 

>KVP​

(0018,0060)​

1​

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

 

>X-Ray Tube Current in​

(0018,9330)​

1​

Nominal X-Ray tube current in milliamperes.​

 

mA​

 

 

 

 

>Data Collection​

(0018,0090)​

1​

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

Diameter​

 

 

 

 

>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.​

 

>Filter Material​

(0018,7050)​

1​

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

 

>Exposure in mAs​

(0018,9332)​

3​

The exposure expressed in milliampere seconds, for example calculated​

 

 

 

from exposure time and X-Ray tube current.​

 

- Standard -​

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