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Page 438​

 

DICOM PS3.16 2020a - Content Mapping Resource​

 

 

NL​ Rel with Parent​ VT​

Concept Name​

VM​

Req​ Condition​Value Set Constraint​

 

 

 

 

 

 

Type​

 

3​

>>​

HAS CONCEPT​CODE​

EV (363703001, SCT, "Has​

1​

M​

DCID 3629 “Procedure​

 

 

MOD​

 

Intent")​

 

 

Intent”​

4​

>​

 

INCLUDE​

DTID 1002 “Observer​

1-n​

M​

 

 

 

 

 

Context”​

 

 

 

5​

>​

HAS OBS​

DATETIME​ EV (113809, DCM, "Start of​

1​

M​

 

 

 

CONTEXT​

 

X-Ray Irradiation")​

 

 

 

6​

>​

HAS OBS​

DATETIME​ EV (113810, DCM, "End of​

1​

M​

 

 

 

CONTEXT​

 

X-Ray Irradiation")​

 

 

 

7​

>​

HAS OBS​

CODE​

EV(113705,DCM,"Scopeof​

1​

M​

DCID 10000 “Scope of​

 

 

CONTEXT​

 

Accumulation")​

 

 

Accumulation”​

8​

>>​

HAS​

UIDREF​

DCID 10001 “UID Types”​

1​

M​

 

 

 

PROPERTIES​

 

 

 

 

 

9​

>​

CONTAINS​

INCLUDE​

DTID 10012 “CT​

1​

M​

 

 

 

 

 

Accumulated Dose Data”​

 

 

 

10​

>​

CONTAINS​

INCLUDE​

DTID 10013 “CT Irradiation​

1-n​

M​

 

 

 

 

 

Event Data”​

 

 

 

11​

>​

CONTAINS​

TEXT​

EV (121106, DCM,​

1​

U​

 

 

 

 

 

"Comment")​

 

 

 

12​

>​

CONTAINS​

CODE​

EV (113854, DCM, "Source​

1-n​

M​

DCID 10021 “Source of​

 

 

 

 

of Dose Information")​

 

 

CT Dose Information”​

13​

>​

CONTAINS​

INCLUDE​

DTID 1020 “Person​

1​

U​

$PersonProcedureRole​

 

 

 

 

Participant”​

 

 

= EV (113850, DCM,​

 

 

 

 

 

 

 

"IrradiationAuthorizing")​

Content Item Descriptions​

 

 

 

 

 

Row 4​

The observer context may include both a Person Observer identification, as well as the identity of the​

 

 

equipment providing the values for the irradiation event (Device Observer identification), if not inherited.​

Row 5​

Start, DateTime of the first CT Irradiation Event of the accumulation​

 

Row 6​

End, DateTime of the last CT Irradiation Event of the accumulation​

 

Row 12​

The primary source of information from which this dose object was constructed.​

Row 13​

Thephysicianresponsiblefordeterminingthattheirradiatingprocedurewasappropriatefortheindications.​

 

 

ThevaluemaycomefromRequestingPhysician(0032,1032),RequestingPhysicianIdentificationSequence​

 

 

(0032,1031) or somewhere else based on hospital policies.​

 

 

TID 10012 CT Accumulated Dose Data​

This general Template provides detailed information on CT X-Ray dose value accumulations over several irradiation events from the​ same equipment and over the scope of accumulation specified for the report (typically a Study or a Performed Procedure Step).​

Type:​

Extensible​

Order:​

Significant​

Root:​

No​

 

Table TID 10012. CT Accumulated Dose Data​

NL​ Rel with​

VT​

Concept Name​

VM​ Req​

Condition​ Value Set Constraint​

Parent​

 

 

Type​

 

1​

CONTAINER​EV (113811, DCM, "CT​

1​ M​

 

AccumulatedDoseData")​

- Standard -​

 

 

 

DICOM PS3.16 2020a - Content Mapping Resource​

Page 439​

 

NL​

Rel with​

VT​

Concept Name​

VM​ Req​

Condition​

Value Set Constraint​

 

 

Parent​

 

 

 

Type​

 

2​

>​

CONTAINS​

NUM​

EV(113812,DCM,"Total​ 1​

M​

 

UNITS = EV ({events},​

 

 

 

 

Number of Irradiation​

 

 

 

UCUM, "events")​

 

 

 

 

Events")​

 

 

 

 

3​

>​

CONTAINS​

NUM​

EV (113813, DCM, "CT​

1​

M​

 

UNITS = EV (mGy.cm,​

 

 

 

 

Dose Length Product​

 

 

 

UCUM, "mGy.cm")​

 

 

 

 

Total")​

 

 

 

 

4​

>​

CONTAINS​

NUM​

EV (113814, DCM, "CT​

1​

U​

 

UNITS = EV (mSv,​

 

 

 

 

Effective Dose Total")​

 

 

 

UCUM, "mSv")​

5​

>>​

HAS​

TEXT​

EV (121406, DCM,​

1​

MC​ XOR row 6​

 

 

 

PROPERTIES​

"Reference Authority")​

 

 

 

 

6​

>>​

HAS​

CODE​

EV (121406, DCM,​

1​

MC​ XOR row 5​

DCID 10015 “CT Dose​

 

 

PROPERTIES​

"Reference Authority")​

 

 

 

Reference Authorities”​

7​

>>​

HAS​

CODE​

EV (370129005, SCT,​

1​

M​

 

DCID 10011 “Effective​

 

 

CONCEPT​

 

"Measurement Method")​

 

 

 

Dose Evaluation​

 

 

MOD​

 

 

 

 

 

Method”​

8​

>>​

HAS​

TEXT​

EV (113815, DCM,​

1​

MC​ IF the value of row 7​

 

 

 

PROPERTIES​

"Patient Model")​

 

 

equals(113800,DCM,​

 

 

 

 

 

 

 

"DLP to E conversion​

 

 

 

 

 

 

 

via MC computation")​

 

 

 

 

 

 

 

or equals (113801,​

 

 

 

 

 

 

 

 

DCM, "CTDIfreeair to​

 

 

 

 

 

 

 

E conversion via MC​

 

 

 

 

 

 

 

computation")​

 

9​

>>​

HAS​

CONTAINER​EV (113816, DCM,​

1​

MC​ IF the value of row 7​

 

 

 

PROPERTIES​

"ConditionEffectiveDose​

 

equals(113802,DCM,​

 

 

 

 

measured")​

 

 

"DLP to E conversion​

 

 

 

 

 

 

 

via measurement") or​

 

 

 

 

 

 

 

equals(113803,DCM,​

 

 

 

 

 

 

 

"CTDIfreeair to E​

 

 

 

 

 

 

 

 

conversion via​

 

 

 

 

 

 

 

 

measurement")​

 

10​

>>>​ CONTAINS​

TEXT​

EV (113817, DCM,​

1​

M​

 

 

 

 

 

 

"Effective Dose Phantom​

 

 

 

 

 

 

 

Type")​

 

 

 

 

11​

>>>​ CONTAINS​

TEXT​

EV (113818, DCM,​

1​

M​

 

 

 

 

 

 

"Dosimeter Type")​

 

 

 

 

12​

>​

CONTAINS​

TEXT​

EV (121106, DCM,​

1​

U​

 

 

 

 

 

 

"Comment")​

 

 

 

 

13​

>​

CONTAINS​

INCLUDE​

DTID 1021 “Device​

1​

MC​ Required if the​

$DeviceProcedureRole​

 

 

 

 

Participant”​

 

 

irradiating device is​

= EV (113859, DCM,​

 

 

 

 

 

 

 

not the recording​

"Irradiating Device")​

 

 

 

 

 

 

 

device and the dose​

 

 

 

 

 

 

 

 

was accumulated on​

 

 

 

 

 

 

 

 

a single device.​

 

Content Item Descriptions​

- Standard -​

Page 440​

DICOM PS3.16 2020a - Content Mapping Resource​

Rows 5, 6​

Total Number of CT irradiation events.​

 

A CT irradiation event is one continuous irradiation procedure and is defined through consistent acquisition​

 

parameters.​

 

In the case of dose modulation the calculations are based on the effective parameters (e.g., the effective mA​

 

recorded in the Mean X-Ray Tube Current), and these acquisition parameters are consistent.​

Rows 5, 6​

The Dose Length Product (DLP) is calculated for every irradiation event. The Dose Length Product Total is the​

 

sum of the DLP values. The calculation is based on the CTDIvol result of each irradiation event.​

Rows 5, 6​

Effective dose (E, in units of mSv) evaluated as a total over the scope is defined in Row 6 of Template TID​

 

10011 “CT Radiation Dose”.​

 

Effective dose is defined by the reference in Rows 5 or 6 of this Template.​

 

It may be calculated from a product of DLP and an 'Effective Dose Conversion Factor' (E/DLP). Or it may be​

 

calculatedfromaproductoftheMeanCTDIfreeairandtheratioE/CTDIfreeair.TheratiosE/DLPorE/CTDIfreeair​

 

may be evaluated either from computer simulations applying Monte Carlo (MC) sampling techniques or from​

 

dosimetric measurements in an anthropomorphic phantom, e.g., the Alderson-Rando phantom.. The specific​

 

method used is identified in Rows 7 through 11.​

Row 5 - 6​

ReferenceofthebasepublicationdefiningtheEffectiveDose,eitherasacodedvalue,oratextualbibliographic​

 

reference. ICRP Publications shall be referenced using their assigned coded values.​

Row 7​

Description of the method used for Effective Dose evaluations.​

Row 8​

Description of the reference-patient mathematical or computational model used when Effective Dose is derived​

 

viaMonteCarlosimulationsofradiationtransportinsuchmodels.Examplesofpublicationsthatspecifyparticular​

 

referencepatientmodelsareNUREG/CR-1159,ORNL/NUREG/TM-367(1980);NRPB-R186(1985);GSF-Bericht​

 

S-885 (1986); Fill et al., Health Physics Vol. 86 (3): 253-272 (2004).​

Row 9​

Description of the condition Effective Dose measured​

Row 10​

Type of Effective Dose phantom used, e.g., Alderson-Rando​

Row 11​

Type of dosimeter used, e.g., TLD (Thermo Luminescence Dosimeter)​

Row 13​

ThedevicethatproducedtheirradiationaccumulatedinthisTemplate.I.e.,theCTScanner.Thisisnotrequired​

 

to be present if the information is the same as that already recorded in TID 1004 “Device Observer Identifying​

 

Attributes” encoded via the inclusion of TID 1002 “Observer Context” in TID 10011 “CT Radiation Dose” Row​

 

4, which in turn may be absent if identical to the content in the Enhanced General Equipment Module, or if more​

 

than one device produced the accumulated irradiation.​

TID 10013 CT Irradiation Event Data​

This Template conveys the dose and equipment parameters of a single irradiation event.​

ACTirradiationeventistheloadingofX-Rayequipmentcausedbyasinglecontinuousactuationoftheequipment'sirradiationswitch,​ from the start of the loading time of the first pulse until the loading time trailing edge of the final pulse. Any on-off switching of the ra-​ diation source during the event shall not be treated as separate events; rather the event includes the time between start and stop of​ radiation as triggered by the user, e.g., a single sequence of scanning comprised of multiple slices acquired with successive tube​ rotations and table increments shall be treated as a single irradiation event. Depending on the examination workflow and the anatom-​ icaltargetregiontheCTirradiationeventdatamaysplitintomultipleinstancesofthisTemplateforbetterdoseestimation.Theirradiation​ event is the "smallest" information entity to be recorded in the realm of Radiation Dose reporting. Individual Irradiation Events are​ describedbyasetofaccompanyingphysicalparametersthataresufficienttounderstandthe"quality"ofirradiationthatisbeingapplied.​ This set of parameters may be different for the various types of equipment that are able to create irradiation events.​

Type:​

Extensible​

Order:​

Significant​

Root:​

No​

- Standard -​

DICOM PS3.16 2020a - Content Mapping Resource​ Page 441​

Table TID 10013. CT Irradiation Event Data​

 

NL​

Rel with​

VT​

Concept Name​

VM​ Req​ Condition​

Value Set Constraint​

 

 

Parent​

 

 

 

Type​

 

1​

 

 

CONTAINER​EV (113819, DCM, "CT​

1​

M​

 

 

 

 

 

Acquisition")​

 

 

 

2​

>​

CONTAINS​

TEXT​

EV (125203, DCM,​

1​

U​

 

 

 

 

 

"Acquisition Protocol")​

 

 

 

3​

>​

CONTAINS​

CODE​

EV (123014, DCM,​

1​

M​

DCID 4030 “CT, MR​

 

 

 

 

"Target Region")​

 

 

and PET Anatomy​

 

 

 

 

 

 

 

Imaged”​

4​

>​

CONTAINS​

CODE​

EV (113820, DCM, "CT​

1​

M​

DCID 10013 “CT​

 

 

 

 

Acquisition Type")​

 

 

Acquisition Type”​

4b​

>>​

HAS​

CODE​

EV (113961, DCM,​

1-n​

U​

DCID 10033 “CT​

 

 

PROPERTIES​

"Reconstruction​

 

 

Reconstruction​

 

 

 

 

Algorithm")​

 

 

Algorithm”​

5​

>​

CONTAINS​

CODE​

EV (408730004, SCT,​

1​

U​

DCID 10014 “Contrast​

 

 

 

 

"Procedure Context")​

 

 

Imaging Technique”​

6​

>​

CONTAINS​

UIDREF​

EV (113769, DCM,​

1​

M​

 

 

 

 

 

"Irradiation Event UID")​

 

 

 

6b​

>​

CONTAINS​

TEXT​

EV (113605, DCM,​

1​

U​

 

 

 

 

 

"Irradiation Event Label")​

 

 

6c​

>>​

HAS​

CODE​

EV(113606,DCM,"Label​ 1​

MC​IF the value of Row​DCID 10022 “Label​

 

 

CONCEPT​

 

Type")​

 

6b is the value of an​Types”​

 

 

MOD​

 

 

 

Attribute in the​

 

 

 

 

 

 

 

images.​

 

6d​

>​

CONTAINS​

CODE​

EV (128551, DCM, "Is​

1​

U​

DCID 230 “Yes-No”​

 

 

 

 

Repeated Acquisition")​

 

 

 

6e​

>>​

HAS​

CODE​

EV (128552, DCM,​

1​

M​

DCID 10034 “Reason​

 

 

CONCEPT​

 

"Reason for Repeating​

 

 

for Repeating​

 

 

MOD​

 

Acquisition")​

 

 

Acquisition”​

6f​

>​

CONTAINS​

DATETIME​ EV (111526, DCM,​

1​

U​

 

 

 

 

 

"DateTime Started")​

 

 

 

7​

>​

CONTAINS​

CONTAINER​EV (113822, DCM, "CT​

1​

M​

 

 

 

 

 

Acquisition Parameters")​

 

 

 

8​

>>​

CONTAINS​

NUM​

EV (113824, DCM,​

1​

M​

UNITS = EV (s, UCUM,​

 

 

 

 

"Exposure Time")​

 

 

"s")​

9​

>>​

CONTAINS​

INCLUDE​

DTID 10014 “Scanning​

1​

M​

 

 

 

 

 

Length”​

 

 

 

10​

>>​

CONTAINS​

NUM​

EV (113826, DCM,​

1​

M​

UNITS = EV (mm,​

 

 

 

 

"Nominal Single​

 

 

UCUM, "mm")​

 

 

 

 

Collimation Width")​

 

 

 

11​

>>​

CONTAINS​

NUM​

EV (113827, DCM,​

1​

M​

UNITS = EV (mm,​

 

 

 

 

"Nominal Total​

 

 

UCUM, "mm")​

 

 

 

 

Collimation Width")​

 

 

 

12​

>>​

CONTAINS​

NUM​

EV (113828, DCM, "Pitch​ 1​

MC​IF row 4 equals​

UNITS = EV ({ratio},​

 

 

 

 

Factor")​

 

(116152004, SCT,​ UCUM, "ratio")​

 

 

 

 

 

 

"Spiral Acquisition")​

 

 

 

 

 

 

or equals (113804,​

 

DCM, "Sequenced​

Acquisition")​

- Standard -​

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