DICOM PS3.16 2021e - Content Mapping Resource

TID 10042 Irradiation Event Summary Data

This template documents irradiation event-level summary data.

Type:

Extensible

Order:

Non-Significant

Root:

No

Table TID 10042. Irradiation Event Summary Data

NL

Rel with Parent

VT

Concept Name

VM

Req Type

Condition

Value Set Constraint

1

CONTAINER

EV (130501, DCM, "Irradiation Event Summary Data")

1

M

2

>

CONTAINS

UIDREF

EV (113769, DCM, "Irradiation Event UID")

1

M

3

>

CONTAINS

DATETIME

DT (111526, DCM, "DateTime Started")

1

M

4

>

CONTAINS

DATETIME

DT (111527, DCM, "DateTime Ended")

1

M

5

>

CONTAINS

TEXT

EV (113832, DCM, "Identification of the X-Ray Source")

1

M

6

>

CONTAINS

TEXT

EV (113605, DCM, "Irradiation Event Label")

1

U

7

>>

HAS CONCEPT MOD

CODE

EV (113606, DCM, "Label Type")

1

MC

IF the value of row 6 is the value of an Attribute in the images.

DCID 10022 “Label Types”

8

>

CONTAINS

CODE

EV (113721, DCM, "Irradiation Event Type")

1

M

DCID 10002 “Irradiation Event Types”

9

>

CONTAINS

CODE

EV (111031, DCM, "Image View")

1

U

DCID 4010 “DX View”

DCID 4014 “View for Mammography”

10

>>

HAS CONCEPT MOD

CODE

EV (111032, DCM, "Image View Modifier")

1-n

U

DCID 4011 “DX View Modifier”

DCID 4015 “View Modifier for Mammography”

11

>>

CONTAINS

CODE

EV (113946, DCM, "Projection Eponymous Name")

1

U

DCID 4012 “Projection Eponymous Name”

12

>

CONTAINS

NUM

EV (113845, DCM, "Exposure Index")

1

U

UNITS = EV (1, UCUM, "no units")

13

>

CONTAINS

NUM

EV (113846, DCM, "Target Exposure Index")

1

U

UNITS = EV (1, UCUM, "no units")

14

>

CONTAINS

NUM

EV (113847, DCM, "Deviation Index")

1

U

UNITS = EV (1, UCUM, "no units")

15

>

CONTAINS

IMAGE

EV (113795, DCM, "Acquired Image")

1-n

U

16

>

CONTAINS

NUM

EV (113738, DCM, "Dose (RP)")

1

U

UNITS = EV (Gy, UCUM, "Gy")

17

>

CONTAINS

NUM

EV (111631, DCM, "Average Glandular Dose")

1

U

UNITS = EV (mGy, UCUM, "mGy")

18

>

CONTAINS

CODE

EV (128551, DCM, "Is Repeated Acquisition")

1

U

DCID 231 “Yes-No Only”

19

>>

HAS CONCEPT MOD

CODE

EV (128552, DCM, "Reason for Repeating Acquisition")

1

MC

IFF value of Row 18 = (373066001, SCT, "Yes")

DCID 10034 “Reason for Repeating Acquisition”

DCID 7011 “Rejected for Quality Reasons”

20

>>

CONTAINS

UIDREF

EV (113769, DCM, "Irradiation Event UID")

1

UC

IFF value of Row 18 = (373066001, SCT, "Yes")

21

>

CONTAINS

CODE

EV (130503, DCM, "Is Rejected Acquisition")

1

U

DCID 231 “Yes-No Only”

22

>>

HAS CONCEPT MOD

CODE

EV (130504, DCM, "Reason for Rejecting Acquisition")

1

MC

IFF value of Row 21 = (373066001, SCT, "Yes")

DCID 10034 “Reason for Repeating Acquisition”

DCID 7011 “Rejected for Quality Reasons”

23

>

CONTAINS

NUM

EV (113768, DCM, "Number of Pulses")

1

U

UNITS = EV (1, UCUM, "no units")

24

>>

HAS CONCEPT MOD

CODE

EV (121401, DCM, "Derivation")

1

MC

IFF count of pulses in Row 23 is estimated

EV (414135002, SCT, "Estimated")

25

>

CONTAINS

NUM

EV (113820, DCM, "CT Acquisition Type")

1

U

DCID 10013 “CT Acquisition Type”

26

>

CONTAINS

NUM

EV (113824, DCM, "Exposure Time")

1

U

UNITS = EV (ms, UCUM, "ms")

27

>

CONTAINS

CONTAINER

EV (113829, DCM, "CT Dose")

1

U

28

>>

CONTAINS

NUM

EV (113830, DCM, "Mean CTDIvol")

1

M

UNITS = EV (mGy, UCUM, "mGy")

29

>>

CONTAINS

CODE

EV (113835, DCM, "CTDIw Phantom Type")

1

M

DCID 4052 “Phantom Devices”

30

>>

CONTAINS

NUM

EV (113836, DCM, "CTDIfreeair Calculation Factor")

1

U

UNITS = EV (mGy/mA.s, UCUM, "mGy/mA.s")

31

>>

CONTAINS

NUM

EV (113837, DCM, "Mean CTDIfreeair")

1

U

UNITS = EV (mGy, UCUM, "mGy")

32

>>

CONTAINS

NUM

EV (113838, DCM, "DLP")

1

M

UNITS = EV (mGy.cm, UCUM, "mGy.cm")

33

>>

CONTAINS

NUM

EV (113930, DCM, "Size Specific Dose Estimation")

1-n

U

UNITS = EV (mGy, UCUM, "mGy")

34

>>>

HAS CONCEPT MOD

CODE

EV (370129005, SCT, "Measurement Method")

1

M

DCID 10023 “Size Specific Dose Estimation Method for CT”

35

>>>>

INFERRED FROM

NUM

EV (113931, DCM, "Measured Lateral Dimension")

1

MC

IF value of Row 34 = (113934, DCM, "AAPM 204 Lateral Dimension") or (113936, DCM, "AAPM 204 Sum of Lateral and AP Dimension")

UNITS = EV (mm, UCUM, "mm")

36

>>>>

INFERRED FROM

NUM

EV (113932, DCM, "Measured AP Dimension")

1

MC

IF value of Row 34 = (113935, DCM, "AAPM 204 AP Dimension") or (113936, DCM, "AAPM 204 Sum of Lateral and AP Dimension")

UNITS = EV (mm, UCUM, "mm")

37

>>>>

INFERRED FROM

NUM

EV (113933, DCM, "Derived Effective Diameter")

1

MC

IF value of Row 34 = (113934, DCM, "AAPM 204 Lateral Dimension") or (113935, DCM, "AAPM 204 AP Dimension") or (113936, DCM, "AAPM 204 Sum of Lateral and AP Dimension") or (113937, DCM, "AAPM 204 Effective Diameter Estimated From Patient Age")

UNITS = EV (mm, UCUM, "mm")

38

>>>>

INFERRED FROM

NUM

EV (113980, DCM, "Water Equivalent Diameter")

1

MC

IF value of Row 34 = (113981, DCM, "Water Equivalent Diameter Representative Value")

UNITS = EV (mm, UCUM, "mm")

39

>>>>>

HAS CONCEPT MOD

CODE

EV (370129005, SCT, "Measurement Method")

1

M

DCID 10024 “Water Equivalent Diameter Method”

40

>>>>

INFERRED FROM

UIDREF

EV (113985, DCM, "Series or Instance used for Water Equivalent Diameter estimation")

1-n

MC

IF value of Row 34 = (113982, DCM, "Water Equivalent Diameter Integrated Across Scan Range") or (113984, DCM, "Water Equivalent Diameter From Localizer") or (Row 34 = (113983, DCM, "Water Equivalent Diameter From Raw Data") and the Raw Data is encoded in DICOM).

41

>>>>

INFERRED FROM

NUM

EV (113986, DCM, "Z value of location of Water Equivalent Diameter estimation")

1

MC

IF value of Row 34 = (113981, DCM, "Water Equivalent Diameter Representative Value")

UNITS = EV (mm, UCUM, "mm")

42

>>

CONTAINS

INCLUDE

DTID 10015 “CT Dose Check Details”

1

U

43

>

CONTAINS

TEXT

EV (113842, DCM, "X-Ray Modulation Type")

1

U

44

>

CONTAINS

UIDREF

EV (112227, DCM, "Frame of Reference UID")

1

U

If present, shall be the same UID as in the images resulting from this irradiation event.

45

>

CONTAINS

TEXT

EV (121106, DCM, "Comment")

1

U

46

>

CONTAINS

INCLUDE

DTID 1020 “Person Participant”

1-n

U

$PersonProcedureRole = EV (113851, DCM, "Irradiation Administering")

47

>

CONTAINS

INCLUDE

DTID 1021 “Device Participant”

1

MC

Required if the irradiating device is not the recording device.

$DeviceProcedureRole = EV (113859, DCM, "Irradiating Device")


Content Item Descriptions

Row 3

This shall correspond to the start of the first irradiation in the Irradiation Event.

Row 4

This shall correspond to the end of the last irradiation in the Irradiation Event.

Row 5

Identification the X-Ray source. This designation shall not change for a given source throughout the entire RDSR. Irradiation event values that apply to multiple sources, e.g., CTDI on a dual-source CT scanner, could be described by an instance of this template where the Identification of X-Ray Source indicates multiple sources, e.g., "1 and 2." Irradiation event valuesthat are not traditionally described across multiple sources, e.g., Dose (RP) on a biplane system, should not accumulate these values across both sources.

Row 8

Cone-beam CT is expected to use (113613, DCM, "Rotational Acquisition").

Row 15

Reference to Image instances created during this event, if any. The UID reference(s) provided here shall be the values at the time the images were initially created. (Note that image UIDs may be changed as the images are managed over a long term).

Row 16

Dose applied by this irradiation event, relative to defined reference point. This value may be provided at the Irradiation Event level, but is redundant if the Output Measurement Position is at the same position as the Reference Point defined in TID 10041.

Rows 18, 19, 20

If an acquisition is a repeat because an earlier acquisition was unsatisfactory, this may be recorded along with a coded reason and the earlier acquisition's irradiation event UID. This is intended to help with subsequent analysis by providing a priori information about why the exam might be flagged as an outlier with higher dose exposure values than usual for the type of exam.

Rows 21, 22

If an acquisition is a rejected because it was unsatisfactory, this may be recorded along with a coded reason. This is intended to help with subsequent analysis by providing a priori information about why the exam might be flagged as an outlier with higher dose exposure values than usual for the type of exam.

Row 23

If a precise count of pulses is not available, an estimated number shall be provided, and the Row 24 Concept Modifier shall indicate "Estimated".

Row 25

Description of the method used during acquisition of the CT irradiation event.

Row 26

DICOM attributes exist for both Exposure Time in Seconds and Exposure Time in ms. This row uses milliseconds (ms).

Row 27

CT Dose for one acquisition.

Row 28

"Mean CTDIvol" refers to the average value of the CTDIvol applied within this acquisition.

CTDIvol is the volume CTDIw, where CTDIw is the weighted computed tomography dose index 100 as defined in IEC 60601-2-44.

For Sequenced and Spiral scanning, CTDIvol = CTDIw / Pitch Factor.

For Stationary and Free scanning, CTDIvol = CTDIw ✕ Cumulative Exposure Time/ Exposure Time Per Rotation.

According to IEC 60601-2-44 Ed 3 for Constant Angle Acquisition may be calculated as CTDIvol = (CTDIw / Current Time Product (mAs)) ✕ X-Ray Tube Current (mA) x (Nominal Total Collimation Width (mm) / Table Speed (mm/s)).

Note

The ratio CTDIw / Current Time Product is evaluated independently of the Constant Angle Acquisition but with the same settings of tube voltage and Total Collimation Width as those of the Constant Angle Acquisition.

See also CTDIvol (0018,9345) and Spiral Pitch Factor (0018,9311) in the “Enhanced Computed Tomography Image IOD” in PS3.3 .

Row 29

The type of phantom used for CTDI measurement according to IEC 60601-2-44 (e.g., Head 16 cm diameter PMMA, Body 32 cm diameter PMMA).

Row 30

The CTDI freeair Calculation Factor is the CTDI freeair per mAs, expressed in units of mGy/mAs. The CTDI freeair Calculation Factor may be used in one method calculating Dose. For example, for this acquisition, Effective Dose = Mean X-Ray Tube Current ✕ Cumulative Exposure Time ✕ CTDI freeair Calculation Factor ✕ (Effective Dose/ CTDI freeair).

Row 31

MeanCTDI freeair is the mean CTDI for this acquisition, evaluated free-in-air according to IEC 60601-2-44. MeanCTDI freeair = Mean X-Ray Tube Current ✕ Cumulative Exposure Time ✕ CTDI freeair Calculation Factor. The CTDI freeair may be used in one method of calculating Effective Dose.

Row 32

For Spiral scanning, DLP = CTDI vol ✕ Scanning Length. For Sequenced scanning, DLP = CTDI vol ✕ Nominal Total Collimation Width ✕Cumulative Exposure Time / Exposure Time per Rotation. For Stationary and Free scanning, DLP = CTDI vol ✕ Nominal Total Collimation Width (according to IEC 60601-2-44).

Row 33

More than one Size Specific Dose Estimation may be included, for example if different computation methods are used.

Row 34

The methods of [AAPM Report 204] are listed in CID 10023 "Size Specific Dose Estimation Method for CT"; other methods may be used.

The phantom size used for the calculation is available from the phantom type defined in Row 29.

Row 35

The condition specifies inclusion of the Measured Lateral Dimension if it was used in the calculation.

Row 36

The condition specifies inclusion of the Measured AP Dimension if it was used in the calculation.

Row 37

The Derived Effective Diameter is conditionally included, whether it was derived from measurements or estimated from age, but may not be used for other (non-AAPM Report 204) methods.

Row 38

A single value for Water Equivalent Diameter is encoded in Row 38 if the method uses a single value. It is required if the method uses a representative slice, but may also be present if the method used a Localizer or Raw Data at a single location rather than the entire scan range.

Row 39

The modifier is intended to specify the family of methods and not the specific technique (e.g., for AAPM 220 (113987, DCM, "AAPM 220") is used, not (113981, DCM, "Water Equivalent Diameter Representative Value"), etc.).

Row 40

If the method uses multiple slices across the scan range, the reconstructed image Series or (list of) Instances used is referenced; the values for Water Equivalent Diameter may or may not be recorded in the CT Image Module or CT Exposure Macro of those images. More than one Series may be referenced if the reconstructed images for this acquisition used for Water Equivalent Diameter estimation span multiple series.

If the Water Equivalent Diameter was computed from raw views rather than reconstructed images, then the Raw Data is referenced, if it was encoded in DICOM (it is not required to be).

Row 41

This location is patient (not table or gantry) relative, to allow it to be defined in the Patient Coordinate System and hence related to the Image Position (Patient) in the reconstructed images. It is required if the method uses a representative slice, but may also be present if the method used a Localizer or Raw Data at a single location rather than the entire scan range.

Row 42

Record of details associated with using the NEMA Dose Check Standard [NEMA XR 25-2019].

Row 43

The type of exposure modulation. May use the value of Exposure Modulation Type (0018,9323) from CT Exposure Macro or from CT Image Module.

Row 46

People responsible for the administration of the radiation reported in the irradiation event. May include values that would appear in Performing Physicians' Name (0008,1050), Performing Physician Identification Sequence (0008,1052), Operators' Name (0008,1070) and/or Operator Identification Sequence (0008,1072).

Row 47

The device that produced the irradiation in this irradiation event. This is not required 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 10040 Row 5.

DICOM PS3.16 2021e - Content Mapping Resource