Материал: part03
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If Pixel Spacing (0028,0030) is present and the values are different from those in Imager Pixel Spacing (0018,1164) or Nominal Scanned Pixel Spacing (0018,2010), then the image has been corrected for known or assumed geometric magnification or calibrated with respect to some object of known size at known depth within the Patient.
IfPixelSpacingCalibrationType(0028,0A02)andImagerPixelSpacing(0018,1164)andNominalScannedPixelSpacing(0018,2010) are absent, then it cannot be determined whether or not correction or calibration have been performed.
Note
1.Imager Pixel Spacing (0018,1164) is a required Attribute in DX family IODs.
2.Nominal Scanned Pixel Spacing (0018,2010) is a required Attribute in Multi-frame SC family IODs
10.7.1.2 Pixel Spacing Calibration Type
The Pixel Spacing Calibration Type (0028,0A02) Attribute specifies the type of correction for the effect of geometric magnification or calibration against an object of known size, if any.
Enumerated Values:
GEOMETRYThe Pixel Spacing (0028,0030) values account for assumed or known geometric magnification effects and correspond to some unspecified depth within the Patient; the Pixel Spacing (0028,0030) values may thus be used for measurements of objects located close to the central ray and at the same depth.
FIDUCIALThePixelSpacing(0028,0030)valueshavebeencalibratedbytheoperatororimageprocessingsoftwarebymeasurement of an object (fiducial) that is visible in the pixel data and is of known size and is located close to the central ray; the Pixel Spacing (0028,0030) values may thus be used for measurements of objects located close to the central ray and located at the same depth within the Patient as the fiducial.
10.7.1.3 Pixel Spacing Value Order and Valid Values
All pixel spacing related Attributes are encoded as the physical distance between the centers of each two-dimensional pixel, specified by two numeric values.
The first value is the row spacing in mm, that is the spacing between the centers of adjacent rows, or vertical spacing.
The second value is the column spacing in mm, that is the spacing between the centers of adjacent columns, or horizontal spacing.
To illustrate, consider the example shown in Figure 10.7.1.3-1.
Column spacing = 0.25mm
Row spacing = 0.30mm
Figure 10.7.1.3-1. Example of Pixel Spacing Value Order
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Pixel Spacing = Row Spacing \ Column Spacing = 0.30\0.25.
All pixel spacing related Attributes shall have positive non-zero values, except when there is only a single row or column or pixel of data present, in which case the corresponding value may be zero.
Note
A single row or column or "pixel" may occur in MR Spectroscopy instances.
This description applies to:
•Pixel Spacing (0028,0030)
•Imager Pixel Spacing (0018,1164)
•Nominal Scanned Pixel Spacing (0018,2010)
•Image Plane Pixel Spacing (3002,0011)
•Compensator Pixel Spacing (300A,00E9)
•Detector Element Spacing (0018,7022)
•Presentation Pixel Spacing (0070,0101)
•Printer Pixel Spacing (2010,0376)
•Object Pixel Spacing in Center of Beam (0018,9404)
10.8 SOP Instance Reference Macro
Table 10-11 specifies the Attributes that reference an SOP instance.
Table 10-11. SOP Instance Reference Macro Attributes
Attribute Name |
Tag |
Type |
Description |
Referenced SOP Class UID |
(0008,1150) |
1 |
Uniquely identifies the referenced SOP Class. |
Referenced SOP Instance UID |
(0008,1155) |
1 |
UniquelyidentifiesthereferencedSOPInstance. |
10.9 Content Identification Macro
Table 10-12 describe the Attributes for identifying a SOP Instance potentially created by a human user interacting with an application.
Table 10-12. Content Identification Macro Attributes
Attribute Name |
Tag |
Type |
Attribute Description |
Instance Number |
(0020,0013) |
1 |
A number that identifies this SOP Instance. |
Content Label |
(0070,0080) |
1 |
A label that is used to identify this SOP Instance. |
Content Description |
(0070,0081) |
2 |
A description of the content of the SOP Instance. |
ConceptNameCodeSequence |
(0040,A043) |
3 |
A coded description of the content of the SOP Instance. |
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Only a single Item is permitted in this Sequence. |
>Include Table 8.8-1 “Code Sequence Macro Attributes” |
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No Baseline CID is defined. |
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Attribute Name |
Tag |
Type |
Attribute Description |
Alternate Content Description |
(0070,0087) |
3 |
A Sequence containing alternate descriptions suitable for |
Sequence |
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presentation to the user, e.g., in different languages. One |
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or more Items are permitted in this Sequence. |
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Note |
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The values of Specific Character Set for the |
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entire Data Set need to be sufficient to encode |
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all Items of this Sequence correctly, e.g., using |
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asinglevaluewithbroadsupportsuchasUTF-8, |
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or multiple values with escape sequences. |
>Content Description |
(0070,0081) |
1 |
An alternate description that is used to identify this SOP |
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Instance. |
>Language Code Sequence |
(0008,0006) |
1 |
The language in which Content Description (0070,0081) |
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within this Item is written. A single Item shall be present. |
>>Include Table 8.8-1 “Code Sequence Macro Attributes” |
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DCID 5000 “Languages”. |
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>Concept Name Code |
(0040,A043) |
3 |
An alternate coded description of the content of the SOP |
Sequence |
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Instance. |
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Only a single Item is permitted in this Sequence. |
>>Include Table 8.8-1 “Code Sequence Macro Attributes” |
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No Baseline CID is defined. |
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Content Creator's Name |
(0070,0084) |
2 |
Name of operator (such as a technologist or physician) |
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creating the content of the SOP Instance. |
Content Creator's Identification |
(0070,0086) |
3 |
Identification of the person who created the content. Only |
Code Sequence |
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a single Item is permitted in this Sequence. |
>Include Table 10-1 “Person Identification Macro Attributes Description”
10.9.1 Enhanced Content Identification Macro
The Enhanced Content Identification Macro identifies content using a label supporting lower case characters and specified character sets. If a Code String is required, see Section 10.9 “Content Identification Macro”.
Table 10.9.1-1. Enhanced Content Identification Macro Attributes
Attribute Name |
Tag |
Type |
Attribute Description |
User Content Label |
(3010,0033) |
1 |
User-defined label for this SOP Instance. |
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See Section 10.9.1.1.1. |
Content Description |
(0070,0081) |
2 |
User-defined description for the content of this SOP |
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Instance. |
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See Section 10.9.1.1.1. |
Content Creator"s Name |
(0070,0084) |
2 |
Nameofoperator(suchasatechnologistorphysician) |
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creating the content of the SOP Instance. |
Content Creator"s Identification |
(0070,0086) |
3 |
Identification of the person who created the content. |
Code Sequence |
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Only a single Item is permitted in this Sequence. |
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>Include Table 10-1 “Person Identification Macro Attributes Description”
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10.9.1.1 Enhanced Content Identification Macro Attribute Descriptions
10.9.1.1.1 User Content Label and Content Description
User Content Label (3010,0033) shall represent a user-defined short free text providing the primary identification of this entity to other users. Content Description (0070,0081) allows a longer string containing additional descriptive identifying text.
This information is intended for display to human readers. Shall not be used for structured processing.
10.9.2 Extended Content Identification Macro
The Extended Content Identification Macro identifies content using a label supporting lower case characters and specified character sets. If a Code String is required, see Section 10.9 “Content Identification Macro”.
Table 10.9.2-1. Extended Content Identification Macro Attributes
Attribute Name |
Tag |
Type |
Attribute Description |
User Content Long Label |
(3010,0034) |
1 |
User-definedlabelforthecontentofthisSOPInstance. |
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See Section 10.9.2.1.1. |
Content Description |
(0070,0081) |
2 |
User-defined description for the content of this SOP |
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Instance. |
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See Section 10.9.2.1.1. |
Content Creator's Name |
(0070,0084) |
2 |
Nameofoperator(suchasatechnologistorphysician) |
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creating the content of the SOP Instance. |
Content Creator's Identification |
(0070,0086) |
3 |
Identification of the person who created the content. |
Code Sequence |
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Only a single Item is permitted in this Sequence. |
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>Include Table 10-1 “Person Identification Macro Attributes Description”
10.9.2.1 Extended Content Identification Macro Attribute Descriptions
10.9.2.1.1 User Content Long Label and Content Description
User Content Long Label (3010,0034) shall represent a user-defined free text providing the primary identification of this entity to other users. Content Description (0070,0081) allows a longer string containing additional descriptive identifying text.
This information is intended for display to human readers. Shall not be used for structured processing.
10.10 General Contributing Sources Macro
Table 10-13 contains IOD Attributes that describe the general characteristics of the contributing sources used to create a new SOP Instance.
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Table 10-13. General Contributing Sources Macro Attributes
Attribute Name |
Tag |
Type |
Attribute Description |
ContributingSOPInstances |
(0020,9529) |
1C |
A Sequence that identifies the contributing SOP Instances. |
Reference Sequence |
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Required if this SOP Instance is created from other DICOM SOP |
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Instances. |
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Note |
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The Attribute is absent in the case where the sources used |
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to create this SOP Instance are not SOP Instances, e.g., a |
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volume that was directly generated by an acquisition |
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system. |
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One or more Items shall be included in this Sequence. |
>Study Instance UID |
(0020,000D) |
1 |
Unique identifier for the Study of the Contributing SOP Instances. |
>Referenced Series |
(0008,1115) |
1 |
Sequence of Items each of which includes the Attributes of one |
Sequence |
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Series. |
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One or more Items shall be included in this Sequence. |
>>Series Instance UID |
(0020,000E) |
1 |
Unique identifier of the Series containing the referenced Instances. |
>>Series Number |
(0020,0011) |
2 |
A number that identifies this Series. |
>>Referenced Instance |
(0008,114A) |
1 |
Sequence of Items each providing a reference to an Instance that |
Sequence |
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is part of the Series defined by Series Instance UID (0020,000E) in |
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the enclosing Item. |
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One or more Items shall be included in this Sequence. |
>>>Include Table 10-11 “SOP Instance Reference Macro |
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Attributes” |
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>>>Instance Number |
(0020,0013) |
2 |
A number that identifies this instance. |
Manufacturer |
(0008,0070) |
2 |
Manufacturer of the equipment that produced the sources. |
Manufacturer's Model |
(0008,1090) |
1C |
Manufacturer's model name of the equipment that produced the |
Name |
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sources. |
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RequiredifpresentandconsistentinthecontributingSOPInstances. |
Device Serial Number |
(0018,1000) |
1C |
Manufacturer's serial number of the equipment that produced the |
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sources. |
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RequiredifpresentandconsistentinthecontributingSOPInstances. |
Software Versions |
(0018,1020) |
1C |
Manufacturer'sdesignationofsoftwareversionoftheequipmentthat |
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produced the sources. See Section C.7.5.1.1.3. |
RequiredifpresentandconsistentinthecontributingSOPInstances.
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