Ct sr dose, extension for Exposure Modulation Type Status: Final Text




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CP-957 Date 2009/10/29

CT SR dose, extension for Exposure Modulation Type Status: Final Text



DICOM Correction Item

Correction Number CP-957

Log Summary: CT SR dose, extension for Exposure Modulation Type

Type of Modification

Addition


Name of Standard

PS3.16 – 2008



Rationale for Correction

To be able to record, if exposure modulation has been used to reduce the dose applied to the patient, “Exposure Modulation Type (0018,9323)” shall also be included within the CT Dose SR report for information and evaluation.

For the CT specialist or for the physicist it shall be possible to get an overview about measures used for dose saving.


Sections of documents affected

PS 3.16, TID 10013



Correction Wording: n.a.

Add to PS 3.16, TID 10013

TID 10013


CT IRRADIATION EVENT DATA
Type: Extensible




NL

Rel with Parent

VT

Concept Name

VM

Req Type

Condition

Value Set Constraint



























29

>>>>

HAS PROPERTIES

NUM

EV (113840, DCM, “Effective Dose Conversion Factor”)

1

MC

IF row 28 is present and equals (113800, DCM, “DLP to E conversion via MC computation”) or equals (113802, DCM, “DLP to E conversion via measurement”)

Units = EV (mSv/mGycm, UCUM, “mSv/mGycm”)

30

>

CONTAINS

TEXT

EV (113842, DCM, “X-ray Modulation Type”)


1

U







301

>

CONTAINS

TEXT

EV (121106, DCM,

“Comment”)



1

M




DCID (4052) Phantom

Devices





























Content Item Descriptions

Row 29

The Effective Dose Conversion Factor is the ratio of the Effective Dose to the DLP, expressed in units of mSv/mGycm, 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

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













Add to PS 3.16, Annex D DICOM Controlled Terminology Definitions

DICOM Code Definitions (Coding Scheme Designator “DCM” Coding Scheme Version “01”)



Code Value

Code Meaning

Definition

Notes












113842

X-ray Modulation Type

The type of exposure modulation used for the purpose of limiting the dose.




….



























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