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Page 1116​

DICOM PS3.3 2020a - Information Object Definitions​

C.8.22.3.1.3 Attenuation Correction Temporal Relationship​

The Attribute Attenuation Correction Temporal Relationship (0018,9770) specifies the temporal relationship between the attenuation​ correction source image and the PET image data.​

Defined Terms:​

CONCURRENT​The attenuation correction source image is acquired at approximately the same time and with the patient in the​ same body position as the PET image; for example, as acquired on a hybrid scanner​

SEPARATE​ The attenuation correction source image is acquired at a different time, on a different system, or the patient has​ been moved significantly enough to cause soft tissue movement; for example, an attenuation correction source​ image acquired on a separate CT scanner, so that the patient must move from one bed to another​

SIMULTANEOUS​Theattenuationcorrectionsourceimageisacquiredatthesametimeandwiththepatientinthesamebodyposition​ as the PET image​

C.8.22.4 Enhanced PET Isotope Module​

Table C.8.22-9 contains IOD Attributes that describe a PET Isotope.​

Table C.8.22-9. Enhanced PET Isotope Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

RadiopharmaceuticalInformation​

(0054,0016)​

1​

Sequence of Items that describe isotope information.​

Sequence​

 

 

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

 

 

 

>Radiopharmaceutical Agent​

(0018,9729)​

1​

Identifying number, unique within this SOP Instance, of the​

Number​

 

 

agent administered. Used to reference this particular agent​

 

 

 

from the Radiopharmaceutical Functional Group Macro. The​

 

 

 

number shall be 1 for the first Item and increase by 1 for each​

 

 

 

subsequent Item.​

>Radionuclide Code Sequence​

(0054,0300)​

1​

Sequence that identifies the radionuclide.​

 

 

 

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

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

 

BCID 4020 “PET Radionuclide”.​

>Administration Route Code​

(0054,0302)​

1​

Sequence that identifies the administration route of the​

Sequence​

 

 

radiopharmaceutical.​

 

 

 

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

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

 

BCID 11 “Route of Administration”.​

>Radiopharmaceutical Volume​

(0018,1071)​

3​

Volume of administered radiopharmaceutical in cubic cm.​

>Radiopharmaceutical Start​

(0018,1078)​

1​

Time of start of administration. The actual time of​

DateTime​

 

 

radiopharmaceutical administration to the patient for imaging​

 

 

 

purposes.​

>Radiopharmaceutical Stop​

(0018,1079)​

3​

Time of end of administration. The actual ending time of​

DateTime​

 

 

radiopharmaceutical administration to the patient for imaging​

 

 

 

purposes.​

>Radionuclide Total Dose​

(0018,1074)​

2​

The radiopharmaceutical dose administered to the patient​

 

 

 

measured in MegaBecquerels (MBq) at the​

 

 

 

Radiopharmaceutical Start DateTime (0018,1078).​

>Radiopharmaceutical​

(0008,3012)​

3​

Unique identification of the administration of the​

Administration Event UID​

 

 

radiopharmaceutical to the patient.​

Note​

The UID is the same Radiopharmaceutical​

Administration Event UID that is in the​

Radiopharmaceutical Radiation Dose Report.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1117​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Radionuclide Half Life​

(0018,1075)​

1​

The radionuclide half life, in seconds, that was used in the​

 

 

 

correction of this image.​

 

>Radionuclide Positron Fraction​

(0018,1076)​

1​

The radionuclide positron fraction (fraction of decays that are​

 

 

 

by positron emission) that was used in the correction of this​

 

 

 

image.​

 

>Radiopharmaceutical Specific​

(0018,1077)​

3​

The activity per unit mass of the radiopharmaceutical, in​

Activity​

 

 

Bq/micromole, at the Radiopharmaceutical Start DateTime​

 

 

 

(0018,1078).​

 

>Radiopharmaceutical Code​

(0054,0304)​

1​

Sequence that identifies the radiopharmaceutical.​

Sequence​

 

 

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

 

 

 

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

 

BCID 4021 “PET Radiopharmaceutical”.​

 

C.8.22.5 Enhanced PET Image Functional Group Macros​

The following sections contain Functional Group Macros specific to the Enhanced PET Image IOD.​

Note​

The Attribute descriptions in the Functional Group Macros are written as if they were applicable to a single frame (i.e., the​ Macro is part of the Per-frame Functional Groups Sequence). If an Attribute is applicable to all frames (i.e., the Macro is part​ of the Shared Functional Groups Sequence) the phrase "this frame" in the Attribute description shall be interpreted to mean​ " for all frames".​

C.8.22.5.1 PET Frame Type Macro​

Table C.8.22-10 specifies the Attributes of the PET Frame Type Functional Group Macro.​

Table C.8.22-10. PET Frame Type Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

PET Frame Type​

(0018,9751)​

1​

A Sequence that describes general characteristics of this frame.​

Sequence​

 

 

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

 

 

 

>Frame Type​

(0008,9007)​

1​

TypeofFrame.Amulti-valuedAttributeanalogoustoImageType​

 

 

 

(0008,0008).​

 

 

 

Enumerated Values and Defined Terms are the same as those​

 

 

 

for the four values of Image Type (0008,0008) Attribute, except​

 

 

 

that the value MIXED is not allowed unless the SOP Class UID​

 

 

 

is "1.2.840.10008.5.1.4.1.1.128.1" (Legacy Converted). See​

 

 

 

Section C.8.16.1 and Section C.8.22.3.1.​

>IncludeTableC.8-131“CommonCT/MRImageDescriptionMacro​ Attributes”​

C.8.22.5.2 PET Frame Acquisition Macro​

Table C.8.22-11 specifies the Attributes of the PET Frame Acquisition Functional Group Macro.​

Table C.8.22-11. PET Frame Acquisition Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

PET Frame Acquisition​

(0018,9732)​

1​

Contains the Attributes defining the PET acquisition mode.​

Sequence​

 

 

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

 

 

 

- Standard -​

Page 1118​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Table Height​

(0018,1130)​

1​

Thedistanceinmmfromthetopofthepatienttabletothedatacollection​

 

 

 

center.Thedistanceispositivewhenthetableisbelowthedatacollection​

 

 

 

center.​

>Gantry/Detector Tilt​

(0018,1120)​

1​

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

 

 

 

mathematicalcomputations.Zerodegreesmeansthegantryisnottilted,​

 

 

 

negativedegreesarewhenthetopofthegantryistiltedawayfromwhere​

 

 

 

the table enters the gantry.​

>Gantry/Detector Slew​

(0018,1121)​

1​

Nominal angle of slew in degrees of the gantry. Not intended for​

 

 

 

mathematical computations. Zero degrees means the gantry is no​

 

 

 

slewed. Positive slew is moving the gantry on the patient's left toward​

 

 

 

the patient's superior, when the patient is supine.​

>Data Collection Diameter​

(0018,0090)​

1​

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

 

 

 

Section C.8.22.5.4.1.​

C.8.22.5.3 PET Detector Motion Details Macro​

Table C.8.22-12 specifies the Attributes of the PET Detector Motion Details Functional Group Macro.​

Table C.8.22-12. PET Detector Motion Details Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

PET Detector Motion Details​

(0018,9733)​

1​ Contains the Attributes defining the details of the motion of the​

Sequence​

 

 

Detector.​

 

 

 

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

>Rotation Direction​

(0018,1140)​

1​ Direction of rotation of the detector about the gantry, as viewed​

 

 

 

while facing the gantry where the table enters the gantry.​

 

 

 

Enumerated Values:​

 

 

 

CW​clockwise​

 

 

 

CC​counter clockwise​

>Revolution Time​

(0018,9305)​

1​ Thetimeinsecondsofacompleterevolutionofthedetectoraround​

 

 

 

the gantry orbit.​

C.8.22.5.4 PET Position Macro​

Table C.8.22-14 specifies the Attributes of the PET Position Functional Group Macro.​

Table C.8.22-14. PET Position Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

PET Position Sequence​(0018,9735)​

1​

Contains the Attributes defining the PET geometry.​

 

 

 

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

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1119​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>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.8.22.5.4.1.​

 

 

 

Required if Frame Type (0008,9007) Value 1 equals ORIGINAL. May be present​

 

 

 

otherwise.​

 

>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.8.22.5.4.1.​

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 equals ORIGINAL. May be present​ otherwise.​

C.8.22.5.4.1 Relationships Between PET Geometric Attributes (Informative)​

In Figure C.8.22-1 the relationship of the Geometric Attributes within the PET Geometry and PET 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.8.22-1, 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 1120​

DICOM PS3.3 2020a - Information Object Definitions​

Scan Field

Data Collection Diameter

Data Collection Center

Image Pixel Data

Reconstruction Center

Reconstruction Diameter

Reconstruction Field of View (height)

Reconstruction Field of View (width)

- 0 +

Gantry Tilt

Figure C.8.22-1. Geometry of PET Acquisition System​

C.8.22.5.5 PET Frame Correction Factors Macro​

Table C.8.22-15 specifies the Attributes of the PET Frame Correction Factors Functional Group Macro.​

Table C.8.22-15. PET Frame Correction Factors Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

PET Frame Correction​

(0018,9736)​

1​

Contains the Attributes that describe the correction factors applied to this​

Factors Sequence​

 

 

frame.​

 

 

 

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

>Primary (Prompts) Counts​

(0054,1310)​

1C​

The sum of events that occur in the primary event channel. The counts​

Accumulated​

 

 

includeTrues+Scatter+RandomsifCorrectedImage(0028,0051)includes​

 

 

 

RAN; otherwise the counts are Trues +Scatter.​

 

 

 

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

 

 

 

present otherwise.​

>Slice Sensitivity Factor​

(0054,1320)​

1C​

The slice-to-slice sensitivity correction factor that was used to correct this​

 

 

 

frame.Thevalueshallbeoneifnoslicesensitivitycorrectionwasapplied.​

 

 

 

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

 

 

 

present otherwise.​

>Decay Factor​

(0054,1321)​

1C​

The decay factor that was used to scale this frame.​

 

 

 

Required if Decay Corrected (0018,9758) equals YES.​

- Standard -​

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