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DICOM PS3.3 2020a - Information Object Definitions​

Page 1371​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>PrivateCreatorReference​ (0008,0302)​

1​

The value of the Private Creator Data Element value used to reserve the​

 

 

 

block of Private Data Elements whose characteristics are described in​

 

 

 

this Item.​

 

 

 

 

Note​

 

 

 

 

PrivateblocksareidentifiedbytheirPrivateCreatorDataElement​

 

 

 

value, rather than their numeric block number, since instances​

 

 

 

maybemodifiedandnumericblocknumbersreassignedbutthe​

 

 

 

Private Creator Data Element value, which is required to be​

 

 

 

unique within a Group of Private Data Elements, will be​

 

 

 

preserved.​

 

>Private Data Element​

(0008,0310)​

3​

Description of individual Private Data Elements.​

 

Definition Sequence​

 

 

One or more Items are permitted in this Sequence.​

 

 

 

 

 

>>Private Data Element​

(0008,0308)​

1​

Element Number used to identify the Data Element within the reserved​

 

 

 

block.​

 

 

 

 

The value of this Attribute represents the last two digits of the Data​

 

 

 

ElementTag;i.e.,thevalueofxxin(gggg,00xx)whereggggisthePrivate​

 

 

 

Group Reference (0008,0301).​

 

>>Private Data Element​

(0008,0309)​

1​

Value Multiplicity (VM) of the Data Element.​

 

Value Multiplicity​

 

 

See Section C.12.1.1.7.1.​

 

 

 

 

 

>>Private Data Element​

(0008,030A)​

1​

Value Representation (VR) of the Data Element.​

 

Value Representation​

 

 

 

 

>>Private Data Element​

(0008,030B)​

1C​

Number of Items allowed in a Sequence Data Element.​

 

Number of Items​

 

 

Required if the value of Private Data Element Value Representation​

 

 

 

 

 

 

(0008,030A) is SQ.​

 

 

 

 

See Section C.12.1.1.7.2.​

 

>>Private Data Element​

(0008,030D)​

1​

Keyword for the Data Element (in the sense of the keywords provided in​

Keyword​

 

 

PS3.6).​

 

>>Private Data Element​

(0008,030C)​

1​

Name for referring to the Data Element.​

 

Name​

 

 

 

 

>>Private Data Element​

(0008,030E)​

3​

Description of the purpose and/or proper usage of the Data Element.​

Description​

 

 

 

 

>>Private Data Element​

(0008,030F)​

3​

Description of how the Data Element value contents are encoded.​

Encoding​

 

 

 

 

>>Retrieve URI​

(0040,E010)​

3​

Retrieval access path to associated documentation.​

 

 

 

 

Includes fully specified scheme, authority, path, and query in accordance​

 

 

 

with [RFC3986].​

 

- Standard -​

Page 1372​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

>Block Identifying​

(0008,0303)​

1​

Specifies whether some or all of the Private Data Elements in the block​

Information Status​

 

 

aresafefromidentityleakageasdefinedbyPS3.15SectionE.3.10Retain​

 

 

 

Safe Private Option.​

 

 

 

Enumerated Values:​

 

 

 

SAFE​ no Data Elements within the block contain identifying​

 

 

 

information​

 

 

 

UNSAFE​all Data Elements within the block may contain identifying​

 

 

 

information​

 

 

 

MIXED​ some Data Elements within the block may contain identifying​

 

 

 

information​

>Nonidentifying Private​

(0008,0304)​

1C​

List of Private Data Elements in block that do not contain identifying​

Elements​

 

 

information (are safe from identity leakage).​

 

 

 

Elements are identified by the lowest 8-bits of the Date Element Tag (i.e.,​

 

 

 

withavaluefrom0000Hto00FFH)withintheblock,storedasanunsigned​

 

 

 

short integer. Multiple values shall be in increasing order and a given​

 

 

 

value shall be listed at most once.​

 

 

 

Required if Block Identifying Information Status (0008,0303) equals​

 

 

 

MIXED.​

>Deidentification Action​

(0008,0305)​

3​

Actionstobeperformedonelementwithintheblockthatarenotsafefrom​

Sequence​

 

 

identify leakage.​

 

 

 

One or more Items are permitted in this Sequence.​

>>Identifying Private​

(0008,0306)​

1​

List of Private Data Elements in block that may contain identifying​

Elements​

 

 

information (are unsafe from identity leakage).​

Elements are identified by the lowest 8-bits of the Data Element Tag (i.e.,​ withavaluefrom0000Hto00FFH)withintheblock,storedasanunsigned​ short integer. Multiple values shall be in increasing order and a given​ value shall be listed at most once.​

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1373​

Attribute Name​

Tag​

Type​

Attribute Description​

 

>>Deidentification Action​

(0008,0307)​

1​

Recommendedactiontobeperformedduringde-identificationonelements​

listed in Identifying Private Elements (0008,0306) within this Item.​ Note​

A specific type of action is suggested in order to minimize the​ impact of de-identification on the behavior of recipients that use​ the Private Data Elements.​

Enumerated Values:​

D​replace with a non-zero length value that may be a dummy value and​ consistent with the VR​

Z​replace with a zero length value, or a non-zero length value that may​ be a dummy value and consistent with the VR​

X​remove​

U​replace with a non-zero length UID that is internally consistent within​ a set of Instance​

Note​

1.​No C (clean) action is specified, since replacement with​ values of similar meaning known not to contain identifying​ information and consistent with the VR requires an​ understanding of the meaning of the value of the element.​ Whetherornottocleanratherthanremoveorreplacevalues​ is at the discretion of the implementer.​

2.​Nosuggesteddummyvalueisprovided,sincetheencoding​ of the value would depend on the VR of the Data Element.​

3.​FurtherexplanationoftheseactionscanbefoundinPS3.15​ Section E.3.1 Clean Pixel Data Option.​

- Standard -​

Page 1374​

DICOM PS3.3 2020a - Information Object Definitions​

Attribute Name​

Tag​

Type​

Attribute Description​

Instance Origin Status​

(0400,0600)​

3​

 

- Standard -​

 

DICOM PS3.3 2020a - Information Object Definitions​

Page 1375​

Attribute Name​

Tag​

Type​

Attribute Description​

 

Categorizesthelocalityoftheentityfromwhencetheinstanceoriginated.​

Enumerated Values:​

LOCAL​ Acquired or created in the local entity.​

IMPORTED​Imported from an external entity.​

Note​

1.​The interpretation of the meaning of local and imported are​ user-specific. The purpose of this Attribute is to provide a​ means of communicating a user-specific decision, not to​ attempt to achieve uniformity with respect to any particular​ organizational or geographical boundary around any​ particular organizational or geographical entity, be it an​ entity that is a device, system, facility, office, department,​ site, enterprise, region, nation, etc.​

2.​A typical pattern would be for an archive to set a value of​ LOCAL when receiving instances on the network from a​ modalitywithinthehospitalbuttosetavalueofIMPORTED​ whenreceivinginstancesfromaninterchangemediareader​ oranexternalnetworkinstancesharinggateway.Displaying​ thevalueofthisAttributeinaviewerthenmakesitapparent​ to a user whether or not an instance is "one of their own".​ How a receiver determines whether or not the sender is​ localisnotspecified,butcould,forexample,bedetermined​ from the sender's AE Title.​

3.​When instances are transported from one entity to another​ and then imported, it is expected that this Attribute be set​ to an appropriate value for the new context, overwriting any​ previous value. E.g., a value of LOCAL used within an​ archiveatthesitewheretheinstanceswereacquiredwould​ be coerced to a value of IMPORTED when those instances​ werereceivedbyanothersitetowhichthepatienthadbeen​ transferred. Whether or not previous values of this Attribute​ are copied into Original Attributes Sequence (0400,0561)​ after coercion is not specified.​

4.​It is not expected (but nor is it prohibited) that this Attribute​ willberemovedbyanexportingentity,sinceitmaybeuseful​ to a recipient to know whether or not the instance was local​ to the previous entity or not. Similarly, a modality may​ populate this Attribute with a value of LOCAL after creating​ the images, but is not required to.​

5.​Theround-tripcase,e.g.,whenanimageisacquiredlocally,​ exported, locally deleted and then re-imported may be​ challenging unless a local record is maintained. I.e., after​ acquisition, in the local archive it would be expected to be​ LOCAL. After re-importation without any local state, it may​ be hard to determine that it once was LOCAL. Other​ Attributes such as Institution Name may not be sufficient to​ reliably detect this.​

6.​A new SOP Instance UID (0008,0018) is not required when​ adding or coercing this Attribute, since a derived instance​ is not being created. See Section C.12.4.1.1 Derivation​

- Standard -​

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