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Page 886​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8-71. DX Detector Module Attributes​

Attribute Name​

Tag​

Type​

Attribute Description​

Include Table C.8-71b “Digital X-Ray Detector Macro​

 

Attributes”​

 

 

 

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 (0018,1150) and Detector​

 

 

 

Activation Offset From Exposure (0018,7016).​

Detector Activation​

(0018,7016)​

3​

Offset time in mSec that the detector becomes active after the X-Ray​

Offset From Exposure​

 

 

beam is turned on during acquisition of this image. May be negative.​

Field of View Shape​

(0018,1147)​

3​

Shape of the Field of View, that is the image pixels stored in Pixel Data​

 

 

 

(7FE0,0010).​

 

 

 

Enumerated Values:​

 

 

 

RECTANGLE​

 

 

 

ROUND​

 

 

 

HEXAGONAL​

Field of View​

(0018,1149)​

3​

Dimensions in mm of the Field of View, that is the image pixels stored in​

Dimension(s)​

 

 

Pixel Data (7FE0,0010). If Field of View Shape (0018,1147) is:​

 

 

 

RECTANGLE: row dimension followed by column.​

 

 

 

ROUND: diameter.​

 

 

 

HEXAGONAL: diameter of a circumscribed circle.​

Field of View Origin​

(0018,7030)​

1C​

Offset of the TLHC of a rectangle circumscribing the Field of View, that​

 

 

 

is the image pixels stored in Pixel Data (7FE0,0010), before rotation or​

 

 

 

flipping,fromtheTLHCofthephysicaldetectorareameasuredinphysical​

 

 

 

detector pixels as a row offset followed by a column offset.​

 

 

 

Required if Field of View Rotation (0018,7032) or Field of View Horizontal​

 

 

 

Flip (0018,7034) is present.​

 

 

 

See Section C.8.11.4.1.1 for further explanation.​

Field of View Rotation​

(0018,7032)​

1C​

Clockwise rotation in degrees of Field of View, that is the image pixels​

 

 

 

stored in Pixel Data (7FE0,0010), relative to the physical detector.​

Enumerated Values:​

270​

180​

90​

0​

Required if Field of View Horizontal Flip (0018,7034) is present.​

See Section C.8.11.4.1.1 for further explanation.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 887​

Attribute Name​

Tag​

Type​

 

Attribute Description​

 

Field of View Horizontal​

(0018,7034)​

1C​

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

Flip​

 

 

istheimagepixelsstoredinPixelData(7FE0,0010),afterrotationrelative​

 

 

 

tothephysicaldetectorasdescribedinFieldofViewRotation(0018,7032).​

 

 

 

Enumerated Values:​

 

 

 

 

YES​

 

 

 

 

 

NO​

 

 

 

 

 

Required if Field of View Rotation (0018,7032) is present.​

 

 

 

 

See Section C.8.11.4.1.1 for further explanation.​

 

Imager Pixel Spacing​

(0018,1164)​

1​

Physical distance measured at the front plane of the detector housing​

 

 

 

between the center of each image pixel specified by a numeric pair - row​

 

 

 

spacingvalue(delimiter)columnspacingvalueinmm.SeeSection10.7.1.3​

 

 

 

for further explanation of the value order.​

 

 

 

 

ThevalueofthisAttributeshallneverbeadjustedtoaccountforcorrection​

 

 

 

for the effect of geometric magnification or calibration against an object​

 

 

 

of known size; Pixel Spacing (0028,0030) is specified for that purpose.​

IncludeTable10-10“BasicPixelSpacingCalibrationMacro​

 

 

Attributes”​

 

 

 

 

 

Cassette ID​

(0018,1007)​

3​

Identifierofthecassettethatcontainsthephotostimulablephosphorplate,​

 

 

 

for CR acquisitions.​

 

Plate ID​

(0018,1004)​

3​

Identifier of the photostimulable phosphor plate, for CR acquisitions.​

Table C.8-71b contains common Attributes that describe digital X-Ray detector.​

 

 

Table C.8-71b. Digital X-Ray Detector Macro Attributes​

 

Attribute Name​

Tag​

Type​

Attribute Description​

 

Detector Type​

(0018,7004)​

2​ The type of detector used to acquire this image.​

 

 

 

 

Defined Terms:​

 

 

 

 

 

DIRECT​

X-Ray photoconductor​

 

 

 

 

SCINTILLATOR​Phosphor used​

 

 

 

 

STORAGE​

Storage phosphor​

 

 

 

 

FILM​

Scanned film/screen​

 

Detector Configuration​

(0018,7005)​

3​ The physical configuration of the detector.​

 

 

 

 

Defined Terms:​

 

 

 

 

 

AREA​single or tiled detector​

 

 

 

 

SLOT​scanned slot, slit or spot​

 

Detector Description​

(0018,7006)​

3​ Free text description of detector.​

 

Detector Mode​

(0018,7008)​

3​ Textdescriptionofoperatingmodeofdetector(implementationspecific).​

Detector ID​

(0018,700A)​

3​ The ID or serial number of the detector used to acquire this image.​

Date of Last Detector​

(0018,700C)​

3​ The date on which the detector used to acquire this image as identified​

Calibration​

 

 

in Detector ID (0018,700A) was last calibrated.​

 

Time of Last Detector​

(0018,700E)​

3​ The time at which the detector used to acquire this image as identified​

Calibration​

 

 

in Detector ID (0018,700A) was last calibrated.​

 

ExposuresonDetectorSince​ (0018,7010)​

3​ TotalnumberofX-Rayexposuresthathavebeenmadeonthedetector​

Last Calibration​

 

 

usedtoacquirethisimageasidentifiedinDetectorID(0018,700A)since​

 

 

 

it was calibrated.​

 

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Page 888​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

ExposuresonDetectorSince​

(0018,7011)​

3​

TotalnumberofX-Rayexposuresthathavebeenmadeonthedetector​

Manufactured​

 

 

usedtoacquirethisimageasidentifiedinDetectorID(0018,700A)since​

 

 

 

it was manufactured.​

Detector Time Since Last​

(0018,7012)​

3​

Time in Seconds since an exposure was last made on this detector​

Exposure​

 

 

prior to the acquisition of this image.​

Detector Binning​

(0018,701A)​

3​

Number of active detectors used to generate a single pixel. Specified​

 

 

 

as number of row detectors per pixel then column.​

DetectorManufacturerName​

(0018,702A)​

3​

Name of the manufacturer of the detector component of the acquisition​

 

 

 

system​

Detector Manufacturer's​

(0018,702B)​

3​

Model name of the detector component of the acquisition system​

Model Name​

 

 

 

DetectorConditionsNominal​

(0018,7000)​

3​

Whetherornotthedetectorisoperatingwithinnormaltolerancesduring​

Flag​

 

 

this image acquisition.​

Enumerated Values:​

YES​

NO​

Note​

 

 

Thisflagisintendedtoindicatewhetherornottheremayhave​

 

 

been some compromise of the diagnostic quality of the image​

 

 

due to some condition such as over-temperature, etc.​

Detector Temperature​

(0018,7001)​

3​ Detector temperature during exposure in degrees Celsius.​

Sensitivity​

(0018,6000)​

3​ Detector sensitivity 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 value is manufacturer-specific. DICOM specifies​

 

 

Standard Attributes in Table 10-23 'Exposure Index​

 

 

Macro', which are recommended.​

Detector Element Physical​

(0018,7020)​

3​ Physical dimensions of each detector element that comprises the​

Size​

 

detector matrix, in mm.​

 

 

Expressed as row dimension followed by column.​

 

 

Note​

 

 

This may not be the same as Detector Element Spacing​

 

 

(0018,7022) due to the presence of spacing material between​

 

 

detector elements.​

Detector Element Spacing​

(0018,7022)​

3​ Physicaldistancebetweenthecenterofeachdetectorelement,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.​

Note​

This may not be the same as the Imager Pixel Spacing​ (0018,1164),andshouldnotbeassumedtodescribethestored​ image.​

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DICOM PS3.3 2020a - Information Object Definitions​

Page 889​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Detector Active Shape​

(0018,7024)​

3​ Shape of the active area.​

 

 

 

 

Enumerated Values:​

 

 

 

 

RECTANGLE​

 

 

 

 

ROUND​

 

 

 

 

HEXAGONAL​

 

 

 

 

Note​

 

 

 

 

This may be different from the Field of View Shape​

 

 

 

 

(0018,1147),andshouldnotbeassumedtodescribethestored​

 

 

 

image.​

 

DetectorActiveDimension(s)​

(0018,7026)​

3​ Dimensions in mm of the active area.​

 

 

 

 

If Detector Active Shape (0018,7024) is:​

 

 

 

 

RECTANGLE: row dimension followed by column.​

 

 

 

 

ROUND: diameter.​

 

 

 

 

HEXAGONAL: diameter of a circumscribed circle.​

 

 

 

 

Note​

 

 

 

 

This may be different from the Field of View Dimensions​

 

 

 

(0018,1149),andshouldnotbeassumedtodescribethestored​

 

 

 

image.​

 

Detector Active Origin​

(0018,7028)​

3​ Offset of the TLHC of a rectangle circumscribing the active detector​

 

 

 

area from the TLHC of a rectangle circumscribing the physical detector​

area, measured in physical detector pixels as a row offset followed by​ a column offset.​

See Section C.8.11.4.1.1 for further explanation.​

Include Table 10-23 “Exposure Index Macro Attributes”​

C.8.11.4.1 DX Detector Attribute Descriptions​

C.8.11.4.1.1 Physical, Active, Field of View, Exposed and Displayed Areas​

The relationship between the Physical Detector Area, the Active Detector Area, the Field of View (what is stored in Pixel Data​ (7FE0,0010)), the Exposed Area (after X-Ray Collimation) and the Displayed Area is illustrated in the following diagrams.​

Note​

Some of these Attributes relate the image data to manufacturer specific characteristics of the detector that may be used for​ quality control purposes, e.g., correlation of image artifacts with a detector defect map, analysis of noise performance, etc.​

The Displayed Area is defined in pixel coordinates relative to the stored image pixel values by the Attributes of the Display Shutter​ Module (see Section C.7.6.11). If this Module is not present or supported, then the Displayed Area is equal to the Field of View.​

The Exposed Area is defined in pixel coordinates relative to the stored image pixel values by the Attributes of the X-Ray Collimator​ Module (see Section C.8.7.3).​

For the Digital X-Ray IODs, the Field of View is usually rectangular in shape and usually has the same size as the stored Pixel Data​ (7FE0,0010). The shape and size of the Field of View and the spacing of the pixels are defined by the following Attributes:​

•​Field of View Shape (0018,1147),​

•​Field of View Dimensions (0018,1149),​

- Standard -​

Page 890​

DICOM PS3.3 2020a - Information Object Definitions​

•​Imager Pixel Spacing (0018,1164),​

•​Rows (0028,0010),​

•​Columns (0028,0011).​

In the case where the Field of View has the same size as the stored Pixel Data (7FE0,0010) the following relationships are verified:​

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

•​Field of View Dimensionsrow dimension = Imager Pixel Spacingrow spacing * Rows​

•​Field of View Dimensionscolumn dimension = Imager Pixel Spacingcolumn spacing * Columns​

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

•​Field of View Dimensionsdiameter = Imager Pixel Spacingrow spacing * Rows​

•​Field of View Dimensionsdiameter = Imager Pixel Spacingcolumn spacing * Columns​

The following Attributes define the relationship of the Field of View to the Physical Detector Area:​

•​Field of View Origin (0018,7030),​

•​Field of View Rotation (0018,7032),​

•​Field of View Horizontal Flip (0018,7034).​

For the Digital X-Ray IODs, the Active Area, i.e., that part of the detector matrix that was activated for this exposure, is usually rect-​ angularinshape.TheshapeandsizeoftheActiveAreaandthesizeandspacingofthedetectorsaredefinedbythefollowingAttributes:​

•​Detector Active Shape (0018,7024),​

•​Detector Active Dimensions (0018,7026),​

•​Detector Element Physical Size (0018,7020),​

•​Detector Element Spacing (0018,7022).​

Note​

1.​The Detector Element Physical Size (0018,7020) and Detector Element Spacing (0018,7022) may be different if there​ are insensitive regions between each detector.​

2.​This model of description is not able to accurately describe multiple matrices of detectors that are "tiled" to produce a​ single image.​

The following optional Attribute defines the relationship of the Active Area to the Physical Detector Area:​

•​Detector Active Origin (0018,7028).​

In the case where the Field of View has the same size as the stored Pixel Data (7FE0,0010), the relationship between detectors and​ stored image pixels is defined by Detector Binning (0018,701A), which specifies how many detectors, in each of the row and column​ directions, contribute to (are pooled or averaged to form) a single stored image pixel.​

Note​

1.​Detector Binning (0018,701A) may have values less than one if sub-sampling is used to derive an image with higher​ spatial resolution than the detector matrix.​

2.​The detector binning results in the size of a stored image pixel being different from the contributing physical detector​ pixels. In this case it is important to notice that the Field Of View Origin (0018,7030) is defined with respect to the center​ of the detector element located at the TLHC of the Field of View.​

- Standard -​

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