DICOM PS3.10 2021b - Media Storage and File Format for Media Interchange

A Example of DICOMDIR File Content (Informative) (Current)
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# A Example of DICOMDIR File Content (Informative)

This Annex provides an example of a File content that is based on selected aspects of the example introduced in PS3.3 for the Basic Directory Information Object. This is not a normative Annex. It is only an illustration, which is simply intended to help the reader better understand the organization of a DICOM Directory stored in a DICOMDIR File.

## A.1 Simple Directory Content Example

Table A.1-1 shows in a simplified manner, the content of a simple DICOMDIR File. Values of elements are noted between square brackets (e.g., [1.2.840.10008.34.7.6]). Byte Offsets are shown by symbolic Values noted between brackets (e.g., {1493}).

Table A.1-1. Directory Content Example

| Meta-Info | 128 bytes 4 bytes 0002,0000 0002,0001 0002,0002 0002,0003 0002,0010 0002,0012 ... | File Preamble [all bytes set to 00H] DICOM Prefix [DICM] File Meta Information Group Length File Meta-Information Version [0001] Media Storage SOP Class UID [1.2.840.10008.1.3.10] Media Storage SOP Instance UID [1.2.840.23856.36.45.3] Transfer Syntax UID [1.2.840.10008.1.1] Implementation Class UID [1.2.840.23856.34.90.3] ...
File-set Identification | 0004,1130 ... | File-set ID [EXAMPLE] ...
General Directory Information | 0004,1200 0004,1202 0004,1212 ... 0004,1220 | Offset of First Record of Root Directory Entity {1829} Offset of Last Record of Root Directory Entity {6F18} File-set Consistency Flag [0000H] ... Directory Record Sequence. This Data Element Value includes the following Sequence of Items.
{1829} | Item Tag | FFFE,E000 | Item Data Element (includes the following Data Elements)
Study 1 Directory Record | 0004,1400 0004,1410 0004,1420 ... | Offset of the next Directory Record in Directory Entity (not shown in example) Record In-use Flag [FFFFH] Offset of Referenced Lower Level Directory Entity {2299} ...
0004,1430 | Directory Record Type [STUDY]
Selection Keys | 0020,000D 0020,0010 ... | Study Instance UID [1.2.840.4656.23.4568745] Study ID [srt78UJ] ....
Item Delimitation Tag | FFFE,E00D | Item Delimitation Tag is present only if Item is of undefined length
{2299} | Item Tag | FFFE,E000 | Item Data Element (includes the following Data Elements)
Series 1 Directory Record | 0004,1400 0004,1410 0004,1420 ... | Offset of the next Directory Record in Directory Entity (not shown in example) Record In-use Flag [0FFFFH] Offset of Referenced Lower Level Directory Entity {2681} ...
0004,1430 | Directory Record Type [SERIES]
Selection Keys | 0008,0060 0020,0011 ... | Modality [NM] Series Number [2] ...
| Item Delimitation Tag | FFFE,E00D | Item Delimitation Tag is present only if Item is of undefined length
{2681} | Item Tag | FFFE,E000 | Item Data Element (includes the following Data Elements)
Image 1 Directory Record | 0004,1400 0004,1410 0004,1420 ... | Offset of the next Directory Record in Directory Entity {3419} Record In-use Flag [FFFFH] Offset of Referenced Lower Level Directory Entity [00000000H] ...
0004,1430 | Directory Record Type [IMAGE]
0004,1500 0004,1510 0004,1511 0004,1512 | Referenced File ID [DIR\TDRI\3856G3] Referenced SOP Class UID in File [1.2.840.10008.5.1.4.1.1.5] Referenced SOP Instance UID in File [1.2.840.34.56.78999654.234] Referenced Transfer Syntax UID in File [1.2.840.10008.1.2.1]
Selection Keys | 0008,0018 0020,0013 ... | Image SOP Instance UID [1.2.840.34.56.78999654.234] Image Number [1] ...
Item Delimitation Tag | FFFE,E00D | Item Delimitation Tag is present only if Item is of undefined length
{3419} | Item Tag | FFFE,E000 | Item Data Element (includes the following Data Elements)
Image 2 Directory Record | 0004,1400 0004,1410 0004,1420 ... | Offset of the next Directory Record in Directory Entity (not shown in example) Record In-use Flag [FFFFH] Offset of Referenced Lower Level Directory Entity [00000000H] ...
0004,1430 | Directory Record Type [IMAGE]
0004,1500 0004,1510 0004,1511 0004,1512 | Referenced File ID [DIR\TDRI\3856G7] Referenced SOP Class UID in File [1.2.840.10008.5.1.4.1.1.5] Referenced SOP Instance UID in File [1.2.840.34.56.78999654.235] Referenced Transfer Syntax UID in File [1.2.840.10008.1.2.2]
Selection Keys | 0008,0018 0020,0013 ... | Image SOP Instance UID [1.2.840.34.56.78999654.235] Image Number [2] ...
Item Delimitation Tag | FFFE,E00D | Item Delimitation Tag is present only if Item is of undefined length
{6F18} | Item Tag | FFFE,E000 | Item Data Element (includes the following Data Elements)
Patient C Directory Record | 0004,1400 0004,1410 0004,1430 ... | Offset of the next Directory Record in Directory Entity {00000000H} Record In-use Flag [FFFFH] Directory Record Type [PATIENT] ...
Selection Keys | 0010,0010 0010,0020 .... | Patient Name [Patient C] Patient ID [523-61-8765] ....
Item Delimitation Tag | FFFE,E00D | Item Delimitation Tag is present only if Item is of undefined length
| Sequence Delimitation Tag | FFFE,E0DD | Used only if the Directory Record Sequence (0004,1220) is of undefined length to delimit the end of the Value of the Directory Record Sequence Data Element.

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DICOM PS3.10 2021b - Media Storage and File Format for Media Interchange