Cp- 764 Date 2007/08/28 ct phantom for ctdi dose Measurement Status: Final Text




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CP- 764 Date 2007/08/28

CT Phantom for CTDI Dose Measurement Status: Final Text



DICOM Correction Item

Correction Number CP-764

Log Summary: CT Phantom for CTDI Dose Measurement

Type of Modification

Correction, Addition



Name of Standard

PS3.3, 3.6, 3-16 – 2007



Rationale for Correction

This change proposal requires the CTDI Phantom Type for CT. (CTDIvol = Computed Tomography Dose Index on volume)

CTDIvol attribute is defined within the enhanced CT image IOD (PS 3.3 A.38.1.4) and CT image IOD (PS 3.3 A.3.2).

The CTDI value is based on measurement in specific phantoms. A differentiation is made between head and body. The definition procedure is defined by IEC 60601-2-44

To understand the specified CTDI value within an image object the related phantom type shall be stored in the DICOM header.


Sections of documents affected

PS 3.3 Sections 2, C.8.2.1 and C.8.15.3.8 and PS 3.6 Section 6



Correction Wording

Add to PS 3.3, Table C.8-3

C.8.2.1 CT Image Module


The table in this Section contains IOD Attributes that describe CT images.

Table C.8-3


CT IMAGE MODULE ATTRIBUTES

Attribute Name

Tag

Type

Attribute Description












Include 'General Anatomy Optional Macro' Table 10-7

Defined Context ID for the Anatomic Region Sequence is 4030.

CTDI Phantom Type Code Sequence

(0018,9346)

3

The type of phantom used for CTDI measurement according to IEC 60601-2-44. Only a single Item shall be permitted in this Sequence.

>Include Code Sequence Macro Table 8.8-1

DCID 4052

Add to PS 3.3, Table C.8-124
C.8.15.3.8 CT Exposure Macro

Table C.8-124 specifies the attributes of the CT Exposure Functional Group macro.

Table C.8-124


CT EXPOSURE MACRO ATTRIBUTES

Attribute Name

Tag

Type

Attribute Description












>CTDIvol

(0018,9345)

2C

Computed Tomography Dose Index (CTDIvol), in mGy according to IEC 60601-2-44, Ed.2.1 (Clause 29.1.103.4), The Volume CTDIvol. It describes the average dose for this frame for the selected CT conditions of operation.

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.



>CTDI Phantom Type Code Sequence

(0018,9346)

3

The type of phantom used for CTDI measurement according to IEC 60601-2-44. Only a single Item shall be permitted in this Sequence.

>>Include Code Sequence Macro Table 8.8-1

DCID 4052

Add to PS 3.6, Section 6

6 Registry of DICOM data elements


Tag

Name

VR

VM


















(0018,9346)

CTDI Phantom Type Code Sequence

SQ

1









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