Материал: part16

Row 26​

For Spiral scanning, DLP = CTDIvol Scanning Length. For Sequenced scanning, DLP = CTDIvol Nominal​

Total Collimation Width Cumulative Exposure Time / Exposure Time per Rotation. For Stationary and Free​

scanning, DLP = CTDIvol Nominal Total Collimation Width (according to IEC 60601-2-44).​

Row 27​

Effective Dose in mSv of the single continuous time-frame of the irradiation computed as described in TID​

10012 “CT Accumulated Dose Data”.​

Row 29​

The Effective Dose Conversion Factor is the ratio of the Effective Dose to the DLP, expressed in units of​

mSv/mGy.cm, and it is used as a factor in one method of estimating Effective Dose. Monte Carlo Simulations​

(or dosimetric measurements in an anthropomorphic phantom, e.g., the Alderson-Rando phantom) may be​

used as a basis for the evaluation of Effective Dose Conversion Factors.​

Row 30​

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

are used.​

Row 31​

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 (16cm or 32cm) used for the calculation is available from the phantom type defined in Row​

23.​

Row 32​

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

Row 33​

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

Row 34​

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 34b​

A single value for Water Equivalent Diameter is encoded in Row 34b 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 34c​

The modifier is intended to specify the family of methods and not the specific technique (e.g., for AAPM 220​

(113987,DCM,"AAPM220")isused,not(113981,DCM,"WaterEquivalentDiameterRepresentativeValue"),​

etc.).​

Row 34d​

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 34e​

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 (see TID 10014 “Scanning​

Length”, included at Row 9). 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 35​

Record of details associated with using the NEMA Dose Check Standard (NEMA XR-25-2010).​

Row 36​

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 38​

People responsible for the administration of the radiation reported in the irradiation event. May include values​

thatwouldappearinPerformingPhysicians'Name(0008,1050),PerformingPhysicianIdentificationSequence​

(0008,1052), Operators' Name (0008,1070) and/or Operator Identification Sequence (0008,1072).​

Row 39​

The device that produced the irradiation in this Irradiation Event. I.e., the CT scanner. This is not required to​

be present if the information is the same as that already recorded in the 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.​

DICOM PS3.16 2020a - Content Mapping Resource​

Page 447​

Order:​

Significant​

Root:​

No​

Table TID 10014. Scanning Length​

NL​ Rel​ VT​

Concept Name​

VM​

Req​

Condition​

Value Set Constraint​

with​

Type​

Parent​

1​

NUM​

EV (113825, DCM, "Scanning​

1​

M​

UNITS = EV (mm, UCUM,​

Length")​

"mm")​

2​

NUM​

EV (113893, DCM, "Length of​

1​

U​

UNITS = EV (mm, UCUM,​

Reconstructable Volume")​

"mm")​

3​

NUM​

EV (113899, DCM, "Exposed​

1​

UC​ IFF TID 10013 “CT​UNITS = EV (mm, UCUM,​

Range")​

Irradiation Event​

"mm")​

Data” row 4 CT​

Acquisition Type​

equals (116152004,​

SCT, "Spiral​

Acquisition")​

4​

NUM​

EV (113895, DCM, "Top Z​

1​

U​

UNITS = EV (mm, UCUM,​

Location of Reconstructable​

"mm")​

Volume")​

5​

NUM​

EV (113896, DCM, "Bottom Z​

1​

U​

UNITS = EV (mm, UCUM,​

Location of Reconstructable​

"mm")​

Volume")​

6​

NUM​

EV (113897, DCM, "Top Z​

1​

U​

UNITS = EV (mm, UCUM,​

Location of Scanning Length")​

"mm")​

7​

NUM​

EV (113898, DCM, "Bottom Z​

1​

U​

UNITS = EV (mm, UCUM,​

Location of Scanning Length")​

"mm")​

8​

UIDREF​ EV (112227, DCM, "Frame of​

1​

MC​ IF any of Rows 4​

Ifpresent,shallbethesame​

Reference UID")​

through 7 or Row​

UID as in the images​

34eofTID10013are​reconstructed from this​

present.​

irradiation event.​

Content Item Descriptions​

Row 1​

For Sequenced scanning, the scanning length is the table travel between consecutive scans times the number of​

scans.​

For Stationary and Free scanning, the scanning length is the nominal width of the total collimation.​

Row 2​

The length of the reconstructable volume is the maximum z-range between the outermost edges of the top and​

bottom slices that can be reconstructed from the acquisition.​

For Spiral scanning, the length of reconstructable volume is the z-range between the outermost beginning of the​

first reconstructable slice and the outermost end of the last reconstructable slice (see Figure A-16).​

For Sequenced scanning, the length of reconstructable volume is the z-range between the outermost beginning of​

the first slice and the outermost end of the last slice (i.e., including any skip).​

For Stationary and Free scanning, the length of reconstructable volume is the nominal width of the total collimation.​

Row 3​

For Spiral scanning, the exposed range is as defined in IEC 60601-2-44 (Ed. 3) 302.115(b) (see Figure A-16).​

Exposed range is not defined for other modes of scanning.​

Page 448​

DICOM PS3.16 2020a - Content Mapping Resource​

Type:​

Extensible​

Order:​

Significant​

Root:​

No​

NL​ Rel with​

VT​

Concept Name​

VM​ Req​

Condition​

Value Set Constraint​

Parent​

Type​

1​

CONTAINER​EV (113900, DCM,​

1​

MC​IF the scanning device has​

"Dose Check Alert​

implemented dose alerts​

Details")​

2​

>​

CONTAINS​CODE​

EV (113901, DCM,​

1​

M​

DCID 230 “Yes-No”​

"DLP Alert Value​

Configured")​

3​

>​

CONTAINS​CODE​

EV (113902, DCM,​

1​

M​

DCID 230 “Yes-No”​

"CTDIvol Alert Value​

Configured")​

4​

>​

CONTAINS​NUM​

EV (113903, DCM,​

1​ MC​IFF value of Row 2 is​

UNITS = EV (mGy.cm,​

"DLP Alert Value")​

(373066001, SCT, "Yes")​

UCUM, "mGy.cm")​

5​

>​

CONTAINS​NUM​

EV (113904, DCM,​

1​ MC​IFF value of Row 3 is​

UNITS = EV (mGy,​

"CTDIvol Alert Value")​

(373066001, SCT, "Yes")​

UCUM, "mGy")​

DICOM PS3.16 2020a - Content Mapping Resource​

Page 449​

NL​ Rel with​

VT​

Concept Name​

VM​ Req​

Condition​

Value Set Constraint​

Parent​

Type​

6​

>​

CONTAINS​NUM​

EV (113905, DCM,​

1​

MC​IFAccumulatedDLPForward​UNITS = EV (mGy.cm,​

"Accumulated DLP​

Estimate (Row 6) exceeds​ UCUM, "mGy.cm")​

Forward Estimate")​

DLP Alert Value (Row 4)​

7​

>​

CONTAINS​NUM​

EV (113906, DCM,​

1​

MC​IF Accumulated CTDIvol​

UNITS = EV (mGy,​

"Accumulated CTDIvol​

Forward Estimate (Row 7)​ UCUM, "mGy")​

Forward Estimate")​

exceeds CTDIvol Alert Value​

(Row 5)​

8​

>​

CONTAINS​TEXT​

EV (113907, DCM,​

1​

UC​IFF Accumulated DLP​

"Reason for​

Forward Estimate (Row 6)​

Proceeding")​

exceeds DLP Alert Value​

(Row 4) or Accumulated​

CTDIvol Forward Estimate​

(Row 7) exceeds CTDIvol​

Alert Value (Row 5)​

9​

>​

CONTAINS​INCLUDE​

DTID 1020 “Person​

1​ MC​IFAccumulatedDLPForward​$PersonProcedureRole​

Participant”​

Estimate (Row 6) exceeds​ = EV (113850, DCM,​

DLP Alert Value (Row 4) or​"IrradiationAuthorizing")​

Accumulated CTDIvol​

Forward Estimate (Row 7)​

exceeds CTDIvol Alert Value​

(Row 5)​

10​

CONTAINER​EV (113908, DCM,​

1​

MC​IF the scanning device has​

"Dose Check​

implemented dose​

Notification Details")​

notifications​

11​ >​

CONTAINS​CODE​

EV (113909, DCM,​

1​

M​

DCID 230 “Yes-No”​

"DLP Notification Value​

Configured")​

12​ >​

CONTAINS​CODE​

EV (113910, DCM,​

1​

M​

DCID 230 “Yes-No”​

"CTDIvol Notification​

Value Configured")​

13​ >​

CONTAINS​NUM​

EV (113911, DCM,​

1​ MC​IFF value of Row 11 is​

UNITS = EV (mGy.cm,​

"DLP Notification​

(373066001, SCT, "Yes")​

UCUM, "mGy.cm")​

Value")​

14​ >​

CONTAINS​NUM​

EV (113912, DCM,​

1​ MC​IFF value of Row 12 is​

UNITS = EV (mGy,​

"CTDIvol Notification​

(373066001, SCT, "Yes")​

UCUM, "mGy")​

Value")​

15​ >​

CONTAINS​NUM​

EV (113913, DCM,​

1​

MC​IF DLP Forward Estimate​

UNITS = EV (mGy.cm,​

"DLP Forward​

(Row 15) exceeds DLP​

UCUM, "mGy.cm")​

Estimate")​

Notification Value (Row 13)​

16​ >​

CONTAINS​NUM​

EV (113914, DCM,​

1​

MC​IFCTDIvolForwardEstimate​UNITS = EV (mGy,​

"CTDIvol Forward​

(Row 16) exceeds CTDIvol​ UCUM, "mGy")​

Estimate")​

Notification Value (Row 14)​

17​ >​

CONTAINS​TEXT​

EV (113907, DCM,​

1​ UC​IFF DLP Forward Estimate​

"Reason for​

(Row 15) exceeds DLP​

Proceeding")​

Notification Value (Row 13)​

orCTDIvolForwardEstimate​

(Row 16) exceeds CTDIvol​

Notification Value (Row 14)​

Page 450​

DICOM PS3.16 2020a - Content Mapping Resource​

NL​ Rel with​

VT​

Concept Name​

VM​ Req​

Condition​

Value Set Constraint​

Parent​

Type​

18​ >​ CONTAINS​INCLUDE​

DTID 1020 “Person​

1​ UC​IFF DLP Forward Estimate​ $PersonProcedureRole​

Participant”​

(Row 15) exceeds DLP​

= EV (113850, DCM,​

Notification Value (Row 13)​"IrradiationAuthorizing")​

orCTDIvolForwardEstimate​

(Row 16) exceeds CTDIvol​

Notification Value (Row 14)​

Content Item Descriptions​

Row 1​

Container for Dose Check Alert details.​

Row 2​

Indicates whether a DLP Alert Value was configured (e.g., by the institution) for the exam to which this​

irradiation event belongs.​

Row 3​

Indicates whether a CTDIvol Alert Value was configured (e.g., by the institution) for the exam to which this​

irradiation event belongs.​

Row 4​

The configured value applicable to the current exam that would trigger an alert if the accumulated DLP​

were projected to exceed it.​

Row 5​

The configured value applicable to the current exam that would trigger an alert if the Accumulated CTDIvol​

at any given location were projected to exceed it.​

Row 6​

The value estimated prior to performing this irradiation event of the projected DLP accumulated during this​

exam, including this irradiation event. The estimate may include assumptions such as those described in​

NEMA XR 25-2010.​

Row 7​

The value estimated prior to performing this irradiation event of the projected CTDIvol accumulated during​

this exam, including this irradiation event. The value is for the location with the highest estimated​

accumulation. The actual location is not recorded. The estimate may include assumptions such as those​

described in NEMA XR 25-2010.​

Row 8​

The reason provided by the operator for proceeding with an irradiation event projected to exceed an alert​

value.​

Row 9​

Person responsible for authorizing irradiation projected to exceed an alert value.​

Row 10​

Container for Dose Check Notification details.​

Row 11​

IndicateswhetheraDLPNotificationValuewasconfigured(e.g.,bytheinstitution)fortheProtocolElement​

Row 12​

Indicates whether a CTDIvol Notification Value was configured (e.g., by the institution) for the Protocol​

Row 13​

The configured value applicable to the current irradiation event that would trigger a notification if the DLP​

were projected to exceed it.​

Row 14​

TheconfiguredvalueapplicabletothecurrentirradiationeventthatwouldtriggeranotificationiftheCTDIvol​

were projected to exceed it.​

Row 15​

The value estimated prior to performing this irradiation event of the DLP for this irradiation event. The​

estimate may include assumptions such as those described in NEMA XR 25-2010.​

Row 16​

The value estimated prior to performing this irradiation event of the CTDIvol for this irradiation event. The​

value is for the location with the highest estimated value. The actual location is not recorded. The estimate​

Row 17​

Thereasonprovidedbytheoperatorforproceedingwithanirradiationeventprojectedtoexceedanotification​

value.​

Row 18​

Person responsible for authorizing irradiation projected to exceed a notification value.​