DICOM PS3.3 2019c - Information Object Definitions

C.8.7.2 X-Ray Acquisition Module

Table C.8-27. X-Ray Acquisition Module Attributes

Attribute Name

Tag

Type

Attribute Description

KVP

(0018,0060)

2

Peak kilo voltage output of the X-Ray generator used.

Radiation Setting

(0018,1155)

1

Identify the general level of X-Ray dose exposure.

Enumerated Values:

SC

low dose exposure generally corresponding to fluoroscopic settings (e.g., preparation for diagnostic quality image acquisition)

GR

high dose for diagnostic quality image acquisition (also called digital spot or cine)

X-Ray Tube Current

(0018,1151)

2C

X-Ray Tube Current in mA. Required if Exposure (0018,1152) is not present. May be present otherwise.

X-Ray Tube Current in µA

(0018,8151)

3

X-Ray Tube Current in µA.

Exposure Time

(0018,1150)

2C

Duration of X-Ray exposure in msec. See Section C.8.7.2.1.1. Required if Exposure (0018,1152) is not present. May be present otherwise.

Exposure Time in µS

(0018,8150)

3

Duration of X-Ray exposure in µsec.

Exposure

(0018,1152)

2C

The exposure expressed in mAs, for example calculated from Exposure Time and X-Ray Tube Current. Required if either Exposure Time (0018,1150) or X-Ray Tube Current (0018,1151) are not present. May be present otherwise.

Exposure in µAs

(0018,1153)

3

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

Grid

(0018,1166)

3

Identify the grid. Only a single value shall be present.

Defined Terms:

IN

A Grid is positioned;

NONE

No Grid is used.

Average Pulse Width

(0018,1154)

3

Average width of X-Ray pulse in msec.

Radiation Mode

(0018,115A)

3

Specifies X-Ray radiation mode.

Defined Terms:

CONTINUOUS

PULSED

Type of Filters

(0018,1161)

3

Type of filter(s) inserted into the X-Ray beam (e.g., wedges).

Intensifier Size

(0018,1162)

3

Diameter of X-Ray intensifier in mm

Field of View Shape

(0018,1147)

3

Shape of the Image Intensifier Field of View. See Section C.8.7.2.1.2.

Defined Terms:

ROUND

RECTANGLE

Field of View Dimension(s)

(0018,1149)

3

Dimensions of the Image Intensifier Field of View in mm. If Rectangle, row dimension followed by column; if Round, diameter.

Imager Pixel Spacing

(0018,1164)

3

Physical distance measured at the front plane of the Image Receptor housing between the center of each pixel specified by a numeric pair - row spacing value(delimiter) column spacing value in mm. See Section 10.7.1.3 for further explanation of the value order.

The value of this Attribute shall never be adjusted to account for correction for the effect of geometric magnification or calibration against an object of known size; Pixel Spacing (0028,0030) is specified for that purpose.

Include Table 10-10 “Basic Pixel Spacing Calibration Macro Attributes”

Focal Spot(s)

(0018,1190)

3

Nominal focal spot size in mm used to acquire this image.

Image and Fluoroscopy Area Dose Product

(0018,115E)

3

X-Ray dose, measured in dGy*cm*cm, to which the patient was exposed for the acquisition of this image plus any non-digitally recorded fluoroscopy that may have been performed to prepare for the acquisition of this image.

Note

The sum of the area dose product of all images of a Series or a Study may not result in the total area dose product to which the patient was exposed.


C.8.7.2.1 X-Ray Acquisition Attribute Descriptions
C.8.7.2.1.1 Exposure Time

Exposure time is the cumulative time the patient received X-Ray exposure during this image (Multi-frame image acquisition). Calculation is pulse width * number of frames.

C.8.7.2.1.2 Field of View

The Field of View Attribute describes the shape and dimensions of the Image Receptor Field of View, applicable to both Image Intensifier and Digital Detector. This could be further restricted by the Collimator. See Section C.8.7.3.

DICOM PS3.3 2019c - Information Object Definitions