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Page 1056​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Field of View Horizontal​

(0018,7034)​

1​

Whether or not a horizontal flip has been applied to the Field of View, i.e.,​

Flip​

 

 

the image pixels stored in Pixel Data (7FE0,0010), after rotation relative to​

 

 

 

the physical detector as described in Field of View Rotation (0018,7032).​

 

 

 

Enumerated Values:​

 

 

 

NO​

 

 

 

YES​

 

 

 

See Section C.8.11.4.1.1 for further explanation.​

>Field of View Description​

(0018,9433)​

3​

Manufacturer defined description of the field of view selected during​

 

 

 

acquisition.​

C.8.19.6.3 X-Ray Exposure Control Sensing Regions Macro​

Table C.8.19.6-3 specifies the Attributes that describe the region targeted as area where the X-Ray dose value is estimated.​

Table C.8.19.6-3. X-Ray Exposure Control Sensing Regions Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Exposure Control Sensing​

(0018,9434)​

1​

Sequence containing the Exposure Control Sensing Region for this​

Regions Sequence​

 

 

frame.​

 

 

 

One or more Items shall be included in this Sequence.​

>Exposure Control Sensing​

(0018,9435)​

1​

Shape of the Exposure Control Sensing Region.​

Region Shape​

 

 

Enumerated Values:​

 

 

 

 

 

 

RECTANGULAR​

 

 

 

CIRCULAR​

 

 

 

POLYGONAL​

>Exposure Control Sensing​

(0018,9436)​

1C​

Required if Exposure Control Sensing Region Shape (0018,9435) is​

Region Left Vertical Edge​

 

 

RECTANGULAR.LocationoftheleftedgeoftherectangularExposure​

 

 

 

Control Sensing Region expressed as effective pixel column. See​

 

 

 

Section C.8.19.6.3.1.​

>Exposure Control Sensing​

(0018,9437)​

1C​

Required if Exposure Control Sensing Region Shape (0018,9435) is​

Region Right Vertical Edge​

 

 

RECTANGULAR.LocationoftherightedgeoftherectangularExposure​

 

 

 

Control Sensing Region expressed as effective pixel column. See​

 

 

 

Section C.8.19.6.3.1.​

>Exposure Control Sensing​

(0018,9438)​

1C​

Required if Exposure Control Sensing Region Shape (0018,9435) is​

Region Upper Horizontal Edge​

 

 

RECTANGULAR. Location of the upper edge of the rectangular​

 

 

 

Exposure Control Sensing Region expressed as effective pixel row.​

 

 

 

See Section C.8.19.6.3.1.​

>Exposure Control Sensing​

(0018,9439)​

1C​

Required if Exposure Control Sensing Region Shape (0018,9435) is​

Region Lower Horizontal Edge​

 

 

RECTANGULAR. Location of the lower edge of the rectangular​

 

 

 

Exposure Control Sensing Region expressed as effective pixel row.​

 

 

 

See Section C.8.19.6.3.1.​

>Center of Circular Exposure​

(0018,9440)​

1C​

Required if Exposure Control Sensing Region Shape (0018,9435) is​

Control Sensing Region​

 

 

CIRCULAR. Location of the center of the circular Exposure Control​

 

 

 

Sensing Region expressed as effective pixel row and column. See​

 

 

 

Section C.8.19.6.3.1.​

>Radius of Circular Exposure​

(0018,9441)​

1C​

Required if Exposure Control Sensing Region Shape (0018,9435) is​

Control Sensing Region​

 

 

CIRCULAR. Radius of the circular Exposure Control Sensing Region​

 

 

 

expressed as effective number of pixels along the row direction. See​

 

 

 

Section C.8.19.6.3.1.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1057​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Vertices of the Polygonal​

(0018,9442)​

1C​

Required if Exposure Control Sensing Region Shape (0018,9435) is​

ExposureControlSensingRegion​

 

 

POLYGONAL.​

 

Multiple Values where the first set of two values are:​

row of the origin vertex;​

column of the origin vertex.​

Two or more pairs of values follow and are the effective pixel row and​ column coordinates of the other vertices of the polygon Exposure​ Control Sensing Region. Polygon Exposure Control Sensing Regions​ are implicitly closed from the last vertex to the origin vertex and all​ edges shall be non-intersecting except at the vertices. See​

Section C.8.19.6.3.1.​

C.8.19.6.3.1 X-Ray Exposure Control Sensing Regions Attributes​

The Exposure Control Sensing Region Left Vertical Edge (0018,9436), Exposure Control Sensing Region Right Vertical Edge​ (0018,9437), Exposure Control Sensing Region Upper Horizontal Edge (0018,9438), Exposure Control Sensing Region Lower Hori-​ zontal Edge (0018,9439) and Center of Circular Exposure Control Sensing Region (0018,9440) may have a negative value when the​ point defined by the Attribute lies outside the left or upper border of the pixel data matrix. The top left pixel of the image has a pixel​ row and column value of 1.​

C.8.19.6.4 X-Ray Frame Pixel Data Properties Macro​

Table C.8.19.6-4 specifies the Attributes of the X-Ray Frame Pixel Data Properties Functional Group Macro.​

Table C.8.19.6-4. X-Ray Frame Pixel Data Properties Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Frame Pixel Data​

(0028,9443)​

1​ Sequence containing the pixel data properties for this frame.​

Properties Sequence​

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

>Frame Type​

(0008,9007)​

1​ TypeofFrame.Amulti-valuedAttributeanalogoustoImageType(0008,0008).​

 

 

 

Enumerated Values and Defined Terms are the same as those for the values​

 

 

 

of Image Type (0008,0008).​

 

 

 

See Section C.8.19.2.1.1.​

>Pixel Intensity​

(0028,1040)​

1​ The relationship between the Pixel and the X-Ray beam intensity. See​

Relationship​

 

 

Section C.8.19.6.4.1.1.​

>Pixel Intensity​

(0028,1041)​

1​ The sign of the relationship between the Pixel sample values stored in Pixel​

Relationship Sign​

 

 

Data (7FE0,0010) and the X-Ray beam intensity.​

Enumerated Values:​

+1​Lower pixel values correspond to less X-Ray beam intensity​ -1​ Higher pixel values correspond to less X-Ray beam intensity​

See Section C.8.11.3.1.2 for further explanation.​

- Standard -​

Page 1058​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Imager Pixel Spacing​

(0018,1164)​

1C​

Physical distance measured at the receptor plane of the detector between the​

 

 

 

centersofeachpixelspecifiedbyanumericpair-rowspacingvalue(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 calibration​

 

 

 

againstanobjectofknownsize;PixelSpacing(0028,0030)isspecifiedforthat​

 

 

 

purpose.​

 

 

 

It is only allowed to be adjusted to compensate for the change of the Field of​

 

 

 

View Dimension(s) in Float (0018,9461) Attribute. See Section C.8.19.6.4.1.2​

 

 

 

RequiredifImageType(0008,0008)Value1equalsORIGINAL.Maybepresent​

 

 

 

otherwise.​

 

 

 

Note​

 

 

 

Thesevaluesaretheactualpixelspacingdistancesofthestoredpixel​

 

 

 

values of an image.​

>Pixel Data Area Origin​

(0018,7036)​

3​

Offset of the TLHC of the image stored in Pixel Data (7FE0,0010) from the​

Relative To FOV​

 

 

TLHC of the Field Of View Area after FOV rotation and Flip. It is measured in​

 

 

 

image stored pixels as a row offset followed by a column offset.​

 

 

 

Note​

 

 

 

Due to the differences in image stored pixel and detector element​

 

 

 

spacing, one may expect this Attribute to have non-integer values.​

 

 

 

See Section C.8.19.6.4.1.3.​

>Pixel Data Area Rotation​ (0018,7038)​

3​

Angle clockwise of the row direction of the image stored in Pixel Data​

Angle Relative To FOV​

 

 

(7FE0,0010) relative to the row direction of the Field Of View Area after FOV​

 

 

 

rotation and Flip. It is measured in degrees.​

 

 

 

See Section C.8.19.6.4.1.3.​

>Geometrical Properties​

(0028,9444)​

1​

Geometrical characteristics of the pixel data to indicate whether pixel spacing​

 

 

 

is uniform for all pixels or not.​

 

 

 

Enumerated Values:​

 

 

 

UNIFORM​

 

 

 

NON_UNIFORM​

>Geometric Maximum​

(0028,9445)​

2C​

Thepercentageofthemaximumdeviationofthepixelspacingvaluesofimages​

Distortion​

 

 

for which the geometric properties are non-uniform.​

Note​

This Attribute may be used to judge the result of measurements, 3D​ reconstructions, etc.​

Required if Geometrical Properties (0028,9444) equals NON_UNIFORM.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1059​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>Image Processing​

(0028,9446)​

1​

The type or a combination of types of image processing applied to the pixel​

Applied​

 

 

data before being stored.​

 

Defined Terms:​

DIGITAL_SUBTR​

HIGH_PASS_FILTER​

LOW_PASS_FILTER​

MULTI_BAND_FLTR​

FRAME_AVERAGING​

NONE​

C.8.19.6.4.1 X-Ray Frame Pixel Data Properties Attributes​

C.8.19.6.4.1.1 Pixel Intensity Relationship​

Pixel Intensity Relationship (0028,1040) shall identify the relationship of the pixel values to the X-Ray beam intensity.​

Defined Terms:​

LIN​ Approximately proportional to X-Ray beam intensity.​

LOG​ Non-linear "Log Function"; A Pixel Intensity Relationship LUT shall be included with the image to allow it to be mapped back​ to its proportional value to X-Ray beam intensity.​

OTHER​Not proportional to X-Ray beam intensity. If a TO_LINEAR Pixel Intensity Relationship LUT Item is supplied, scaling back​ to X-Ray beam intensity is possible.​

Note​

1.​When the relationship can be better defined (e.g., square root data) a more precise Defined Term can be used than​ OTHER.​

2.​Providing a TO_LINEAR Pixel Intensity Relationship LUT is encouraged.​

C.8.19.6.4.1.2 Imager Pixel Spacing​

The two values of the Imager Pixel Spacing (0018,1164) Attribute are related to the value(s) of the Field of View Dimension(s) in Float​ (0018,9461) Attribute in the X-Ray Field of View Functional Group of this frame and the values of the Rows (0028,0010) and Columns​ (0028,0011) Attributes.​

The value(s) of Field of View Dimension(s) in Float (0018,9461) may change on a frame by frame base. The values of the Rows and​ Columns Attributes are equal for all frames. The relationship between the Attributes depends on the Field of View Shape (0018,1147)​ Attribute:​

If the Field of View Shape (0018,1147) Attribute equals RECTANGLE:​

Imager Pixel Spacingrow spacing = FOV Dimensionrow dimension / Rows​

Imager Pixel Spacingcolumn spacing = FOV Dimensioncolumn dimension / Columns​

If the Field of View Shape (0018,1147) Attribute equals ROUND or HEXAGONAL:​

Imager Pixel Spacingrow spacing = FOV Dimensiondiameter / Rows​

Imager Pixel Spacingcolumn spacing = FOV Dimensiondiameter / Columns​

C.8.19.6.4.1.3 Pixel Data Area Relative to FOV​

In the case where the Field of View does not have the same size as the stored Pixel Data (7FE0,0010), the stored Pixel Data​ (7FE0,0010) may be the result of cropping, rotation, resizing and/or padding of the Field of View. The following Attributes specify the​ relationship of the Pixel Data area to the Field Of View Area:​

•​Pixel Data Area Origin Relative to FOV (0018,7036)​

- Standard -​

Page 1060​

DICOM PS3.3 2020a - Information Object Definitions​

•​Pixel Data Area Rotation Angle Relative to FOV (0018,7038)​

Note​

In order to make use of the Pixel Data Area Origin Relative to FOV (0018,7036), the Imager Pixel Spacing (0018,1164) is​ needed.​

Field of View

TLHC

 

(0018,7036)

(0018,7038)

 

 

TLHC

 

(after rotation/flip)

 

Pixel Data Area

Figure C.8.19.6.4-1. Explanation of Pixel Data Area Attributes​

C.8.19.6.5 X-Ray Frame Detector Parameters Macro​

Table C.8.19.6-5 specifies the Attributes containing the X-Ray Frame Detector Parameters Functional Group Macro.​

Table C.8.19.6-5. X-Ray Frame Detector Parameters Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Frame Detector Parameters​

(0018,9451)​

1​ Sequence containing the detector properties for this frame.​

Sequence​

 

 

Only a single Item shall be included in this Sequence.​

 

 

 

>Detector Active Time​

(0018,7014)​

3​ Time in mSec that the detector is active during acquisition of this​

 

 

 

image.​

 

 

 

Note​

 

 

 

This activation window overlaps the time of the X-Ray​

 

 

 

exposure as defined by Exposure Time in ms (0018,9328)​

 

 

 

andDetectorActivationOffsetFromExposure(0018,7016).​

>DetectorActivationOffsetFrom​

(0018,7016)​

3​ OffsettimeinmSecthatthedetectorbecomesactiveaftertheX-Ray​

Exposure​

 

 

beamisturnedonduringacquisitionofthisimage.Maybenegative.​

C.8.19.6.6 X-Ray Calibration Device Usage Macro​

Table C.8.19.6-6 specifies the Attributes containing the X-Ray Calibration Device Usage Functional Group Macro.​

Table C.8.19.6-6. X-Ray Calibration Device Usage Macro Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Calibration Sequence​

(0018,9455)​

1​ Sequence containing the calibration flag for this frame.​

 

 

 

Only a single Item shall be included in this Sequence.​

- Standard -​

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