DICOM PS3.3 2019a - Information Object Definitions

C.8.31.5 Breast X-Ray Acquisition Dose Macro

Table C.8.31.5-1 specifies the Attributes of the X-Ray Acquisition Dose Functional Group Macro.

Table C.8.31.5-1. Breast X-Ray Acquisition Dose Macro Attributes

Attribute Name

Tag

Type

Attribute Description

X-Ray Acquisition Dose Sequence

(0018,9542)

1

Sequence containing the X-Ray exposure information for this frame.

Only a single Item shall be included in this Sequence.

>Exposure Time in ms

(0018,9328)

1

Duration of X-Ray exposure in milliseconds.

>Exposure in mAs

(0018,9332)

1

The exposure expressed in mAs, for example calculated from Exposure Time and X-Ray Tube Current.

>Relative X-Ray Exposure

(0018,1405)

3

Indication of the applied dose, in manufacturer specific units.

Note

  1. This value is intended to provide a single location where manufacturer specific information can be found for annotation on a display or film, that has meaning to a knowledgeable observer.

  2. This may be a calculated or measured value. Examples are the detector entrance dose (KB) , the CR sensitivity value (S), or the logarithmic median (lgM).

  3. DICOM specifies Standard Attributes in Table 10-23 “Exposure Index Macro Attributes”, which are recommended.

>Half Value Layer

(0040,0314)

3

The thickness of Aluminum in mm required to reduce the X-Ray Output (0040,0312) by a factor of two.

Note

This value may be a calibrated value rather than measured during the exposure.

>Organ Dose

(0040,0316)

1

Average organ dose value measured in dGy during the acquisition of this image.

Note

This may be an estimated value.

>Entrance Dose in mGy

(0040,8302)

1

Average entrance dose value measured in mGy at the surface of the patient during the acquisition of this image.

Note

This may be an estimated value based on assumptions about the patient's body size and habitus.

>Entrance Dose Derivation

(0040,8303)

3

Describes what type of dose is represented by the values of Entrance Dose in mGy (0040,8302).

Enumerated Values:

IAK

Represents air kerma at the entrance surface, no backscatter included, no air kerma to tissue dose conversion applied.

ESAK

Represents air kerma at the entrance surface, with backscatter included, no air kerma to tissue dose conversion applied.

ESDBS

Represents absorbed dose in tissue at the entrance surface, with backscatter included.

ESDNOBS

Represents absorbed dose in tissue at the entrance surface, without backscatter included.


DICOM PS3.3 2019a - Information Object Definitions