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DICOM PS3.3 2020a - Information Object Definitions​

Page 991​

Attribute Name​

Tag​

Type​

 

Attribute Description​

 

>Table Height​

(0018,1130)​

1C​

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

 

 

 

source (i.e., the data collection center or isocenter). The distance is positive when​

 

 

 

the table is below the data collection center.​

 

 

 

 

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

 

 

 

present otherwise.​

 

>Gantry/Detector Tilt​

(0018,1120)​

1C​

Nominalangleoftiltindegreesofthescanninggantry.Notintendedformathematical​

 

 

 

computations. Zero degrees means the gantry is not tilted, negative degrees are​

 

 

 

when the top of the gantry is tilted away from where the table enters the gantry.​

 

 

 

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

 

 

 

present otherwise.​

 

>Data Collection​

(0018,0090)​

1C​

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

Diameter​

 

 

Section C.8.15.3.6.1.​

 

 

 

 

 

Note​

 

 

 

 

 

In the case of an Acquisition Type (0018,9302) of CONSTANT_ANGLE,​

 

 

 

 

the diameter is that in a plane normal to the central ray of the diverging​

 

 

 

 

X-Ray beam as it passes through the data collection center.​

 

 

 

 

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

 

 

 

present otherwise.​

 

C.8.15.3.4 CT Table Dynamics Macro​

 

 

Table C.8-120 specifies the Attributes of the CT Table Dynamics Functional Group Macro.​

 

 

Table C.8-120. CT Table Dynamics Macro Attributes​

 

Attribute Name​

Tag​

Type​

Attribute Description​

 

CT Table Dynamics​

(0018,9308)​

1​ Contains the Attributes defining the movement of the CT table.​

 

Sequence​

 

 

 

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

 

 

 

 

 

 

>Table Speed​

(0018,9309)​

1C​

 

The distance in mm that the table moves in one second during the gathering of​

 

 

 

 

data that resulted in this frame.​

 

 

 

 

 

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

 

 

 

 

Acquisition Type (0018,9302) is SPIRAL or CONSTANT_ANGLE.​

 

 

 

 

 

May be present otherwise if Frame Type (0008,9007) Value 1 of this frame is​

 

 

 

 

DERIVEDandAcquisitionType(0018,9302)isSPIRALorCONSTANT_ANGLE.​

>Table Feed per​

(0018,9310)​

1C​

 

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

Rotation​

 

 

 

the gantry orbit.​

 

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

Acquisition Type (0018,9302) is SPIRAL.​

May be present otherwise if Frame Type (0008,9007) Value 1 of this frame is​

DERIVED and Acquisition Type (0018,9302) is SPIRAL.​

- Standard -​

Page 992​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Spiral Pitch Factor​

(0018,9311)​

1C​

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

(0018,9307).​

See Section C.8.15.3.4.1 for further explanation and some examples.​

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

Acquisition Type (0018,9302) is SPIRAL.​

May be present otherwise if Frame Type (0008,9007) Value 1 of this frame is​

DERIVED and Acquisition Type (0018,9302) is SPIRAL.​

C.8.15.3.4.1 Spiral Pitch Factor​

The formula for Spiral Pitch Factor (0018,9311) in terms of Table Feed per Rotation (0018,9310) and Total Collimation Width​ (0018,9307) is:​

Spiral Pitch Factor = (Table Feed per Rotation (mm))/(Total Collimation Width (mm))​

An example calculation of Spiral Pitch Factor (0018,9311) for a single slice spiral acquisition of an image with a Total Collimation​ Width of 2.5mm and a Table Feed per Rotation of 10mm is:​

Spiral Pitch Factor = (10 mm) / (2.5 mm) = 4.0​

An example calculation of Spiral Pitch Factor (0018,9311) for a multiple slice spiral acquisition having a Total Collimation Width of​ 20mm and a Table Feed per Rotation of 10mm is:​

Spiral Pitch Factor = (10 mm) / (20 mm) = 0.5​

C.8.15.3.5 CT Position Macro​

Table C.8-121 specifies the Attributes of the CT Position Functional Group Macro.​

Table C.8-121. CT Position Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

CT Position Sequence​

(0018,9326)​

1​

Contains the Attributes defining the CT geometry.​

 

 

 

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

>Table Position​

(0018,9327)​

1C​

Relative longitudinal position of acquisition location of this frame in mm from an​

 

 

 

implementation specific reference point. Shall be relative to the same reference​

 

 

 

point for all frames in this SOP Instance, but may be different from the reference​

 

 

 

pointinotherSOPInstances.Positionsasthetablemovesintothegantryviewed​

 

 

 

from the front are more negative.​

 

 

 

Note​

 

 

 

1.​For contiguous slices reconstructed from multiple detectors one​

 

 

 

would expect different values for adjacent slices.​

 

 

 

2.​Lateral positioning or tilting or swiveling are not described.​

 

 

 

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

 

 

 

present otherwise.​

>DataCollectionCenter​(0018,9313)​

1C​

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

(Patient)​

 

 

the center of the region in which data were collected. See Section C.8.15.3.6.1.​

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

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 993​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Reconstruction Target​(0018,9318)​

1C​ The x, y, and z coordinates (in the Patient-Based Coordinate System) of the​

Center (Patient)​

 

 

reconstruction center target point as used for reconstruction in mm. See​

 

 

 

Section C.8.15.3.6.1.​

 

 

 

 

Note​

 

 

 

 

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

 

 

 

 

corresponds with the Data Collection Center (0018,9313) Attribute.​

 

 

 

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

 

 

 

present otherwise.​

 

C.8.15.3.6 CT Geometry Macro​

 

 

 

 

Table C.8-122 specifies the Attributes of the CT Geometry Functional Group Macro.​

 

 

Table C.8-122. CT Geometry Macro Attributes​

 

Attribute Name​

Tag​

 

Type​

Attribute Description​

 

CT Geometry Sequence​

(0018,9312)​

1​

Contains the Attributes defining the CT geometry.​

 

 

 

 

 

IfMulti-energyCTAcquisition(0018,9361)isNOorisabsent,onlyasingle​

 

 

 

 

Item shall be included in this Sequence.​

 

 

 

 

 

IfMulti-energyCTAcquisition(0018,9361)isYES,oneormoreItemsshall​

 

 

 

 

be included in this Sequence.​

 

>Referenced Path Index​

(0018,9378)​

1C​

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

 

 

 

 

Sequence (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.​

 

>Distance Source to​

(0018,1110)​

1C​

Distance in mm from source to detector center. See Section C.8.15.3.6.1.​

Detector​

 

 

 

Note​

 

 

 

 

 

 

 

 

 

 

This value is traditionally referred to as Source Image Receptor​

 

 

 

 

Distance (SID).​

 

 

 

 

 

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

 

 

 

 

May be present otherwise.​

 

>Distance Source to Data​

(0018,9335)​

1C​

Distance in mm from source to data collection center. See​

 

Collection Center​

 

 

 

Section C.8.15.3.6.1.​

 

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

May be present otherwise.​

C.8.15.3.6.1 Relationships Between CT Geometric Attributes (Informative)​

In Figure C.8-19 the relationship of the Geometric Attributes within the CT Geometry and CT Reconstruction Functional Groups is​ shown. In this example, the Pixel Data is shown encoding the entire reconstructed region with no outside padding or clipping, and​ the reconstructed region is illustrated as being square, i.e., the value of Reconstruction Diameter would be the same as both values​ of Reconstruction Field of View, whichever Attribute is present. Figure C.8-19, viewed from the front of the gantry (where the table​ enters the gantry), is informative only and is not meant to represent a standardization of an equipment-based Frame of Reference.​

- Standard -​

Page 994​

DICOM PS3.3 2020a - Information Object Definitions​

X-Ray Source

Distance - Source to Detector

Distance - Source to Data Collection Center

Scan Field

Data Collection Diameter

Data Collection Center

Image Pixel Data

Reconstruction Target Center (x,y,z)

Reconstruction Diameter

Reconstruction Field of View (height)

Reconstruction Field of View (width)

Detector System

- 0 +

Gantry Tilt:

Scan Angle = 0

Positive in CW direction

Figure C.8-19. Geometry of CT Acquisition System​

C.8.15.3.7 CT Reconstruction Macro​

Table C.8-123 specifies the Attributes of the CT Reconstruction Functional Group Macro.​

Table C.8-123. CT Reconstruction Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

CT Reconstruction​

(0018,9314)​

1​

Contains the Attributes holding information about the reconstruction techniques used.​

Sequence​

 

 

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

 

 

 

>Reconstruction​

(0018,9315)​

1C​

Descriptionofthealgorithmusedwhenreconstructingtheimagefromthedataacquired​

Algorithm​

 

 

during the acquisition process.​

 

 

 

Defined Terms:​

 

 

 

FILTER_BACK_PROJ​

 

 

 

ITERATIVE​

 

 

 

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

 

 

 

present otherwise.​

>Convolution Kernel​(0018,1210)​

1C​

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

 

 

 

single value shall be present.​

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

- Standard -​

 

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 995​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Convolution Kernel​(0018,9316)​

1C​

A label describing the group to which Convolution Kernel (0018,1210).​

 

Group​

 

 

Defined Terms:​

 

 

 

 

 

 

 

 

BRAIN​

 

 

 

 

SOFT_TISSUE​

 

 

 

 

LUNG​

 

 

 

 

BONE​

 

 

 

 

CONSTANT_ANGLE​

 

 

 

 

Required if Convolution Kernel (0018,1210) is present. May be present otherwise.​

>Reconstruction​

(0018,1100)​

1C​ The diameter in mm of the region from which data were used in creating the​

Diameter​

 

 

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

 

 

 

patient may exist outside this region. See Section C.8.15.3.6.1.​

 

 

 

 

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).​

 

 

 

 

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

 

 

 

Reconstruction Field of View (0018,9317) is not present.​

 

 

 

 

OtherwisemaybepresentifFrameType(0008,9007)Value1ofthisframeisDERIVED​

 

 

 

and Reconstruction Field of View (0018,9317) is not present.​

 

>Reconstruction​

(0018,9317)​

1C​

The field of view width followed by height as used for reconstruction in mm.​

Field of View​

 

 

Note​

 

 

 

 

 

If not cropped or padded, for both Pixel Spacing (0028,0030) and​

Reconstruction Pixel Spacing (0018,9322):​

•​The first value (adjacent row spacing) will be equal to the second value of​ Reconstruction Field of View (0018,9317) / Rows (0028,0010).​

•​The second value (adjacent column spacing) will be equal to the first value​ of Reconstruction Field of View (0018,9317) / Columns (0028,0011).​

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

Reconstruction Diameter (0018,1100) is not present.​

OtherwisemaybepresentifFrameType(0008,9007)Value1ofthisframeisDERIVED​ and Reconstruction Diameter (0018,1100) is not present.​

- Standard -​

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