DICOM PS3.3 2024d - Information Object Definitions |
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Table F.3-3 specifies the Attributes of the Directory Information Module, which contain a Sequence of Directory Records forming one or more Directory Entities. This Module defines at least one Directory Entity, the Root Directory Entity (which may be empty). Each Directory Record is composed of Directory Elements (marked by a ">"). They include:
Table F.3-3. Directory Information Module Attributes
Offset of the First Directory Record of the Root Directory Entity |
Offset of the first byte (of the Item Data Element) of the first Directory Record of the Root Directory Entity. This Offset is a number of bytes starting with the first byte of the File Meta Information. When the Root Directory Entity contains no Directory Record, this offset shall be set to 00000000H. Note
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Offset of the Last Directory Record of the Root Directory Entity |
Offset of the first byte (of the Item Data Element) of the last Directory Record of the Root Directory Entity. This Offset is a number of bytes starting with the first byte of the File Meta Information. When the Root Directory Entity contains no Directory Record, this offset shall be set to 00000000H. |
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The value FFFFH shall never be present. NoteFormerly, this Attribute was intended to signal that the directory was in an inconsistent state with a value of FFFFH. This usage has been retired. See PS3.3-2008. |
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Sequence of zero or more Items where each Item contains a Directory Record by including the Directory Elements from (0004,1400) to (0004,1511) and Record selection Keys as defined below (marked with a >). A zero length Value indicates that no Directory Records are contained in the Root Directory Entity. |
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Offset of the first byte (of the Item Data Element) of the next Directory Record of the same Directory Entity. This Offset is an unsigned integer representing a number of bytes starting with the first byte of the File Meta-information. A zero offset shall be used to mean that there is no other Directory Record in this Directory Entity. This Offset may be used to keep an inactive Record (0004,1410) chained with the next Directory Record of the same Directory Entity. |
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The value 0000H shall never be present. NoteFormerly, this Attribute was intended to facilitate the deletion of files, with a value 0000H signally an inactive record. This usage has been retired. See PS3.3-2008. Other Values are reserved and shall not be set by File-set Creators, but if present shall be interpreted as FFFFH by File-set Readers or Updaters. |
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Offset of the first byte (of the Item Data Element) of the first Directory Record of the Referenced Lower Level Directory Entity. This Offset is a number of bytes starting with the first byte of the File Meta Information. When no lower-level Directory Entity (containing at least one Directory Record) is referenced, this Attribute shall have a Value of 00000000H. |
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Defines a specialized type of Directory Record by reference to its position in the Media Storage Directory Information Model (see Section F.4). Enumerated Values:
Note
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Required if the Directory Record Type (0004,1430) is of Value PRIVATE. This UID is used to define a non-standard type of Directory Record by reference to its position in a private extension to the Basic Directory IOD Information Model (see Section F.5). This UID shall be registered according to the procedures defined in PS3.5. Its meaning may or may not be specified in a Conformance Statement. |
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A Multiple Value (see PS3.5) that represents the ordered components of the File ID containing a "referenced object" or Referenced SOP Instance. A maximum of 8 components, each from 1 to 8 characters shall be used (see Section 8.2). NoteThe Referenced File ID provides the means to "locate" the File through the DICOM File Service provided by the Media Format Layer. All referenced Files shall be with the File-set to which the Directory belongs. Any File within the File-set (to which the Directory belongs) shall be referenced by at most one Directory Record. When the Directory Record does not reference any SOP Instance this Attribute shall not be present. |
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Unique ID for the SOP Class of the Instance stored in the referenced File. |
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Unique Identifier for the SOP Instance stored in the referenced file. |
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Unique Identifier for the Transfer Syntax used to encode the Instance stored in the referenced file. |
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Unique ID for the Related General SOP Class(es) related to the SOP Class of the Instance stored in the referenced file. Required if the Directory Record references a SOP Instance that encodes the Related General SOP Class UID (0008,001A). |
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A number of DICOM Data Elements that contain specific Keys defined for each type of Directory Record (0004,1430) defined in Section F.5. |
DICOM PS3.3 2024d - Information Object Definitions |
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