B.3.3 Directory Information in DICOMDIR

Conformant Application Entities shall include in the DICOMDIR File a Basic Directory IOD containing Directory Records at the Patient and subsidiary levels appropriate to the SOP Classes in the File-set.

Note: DICOMDIRs with no directory information are not allowed by this Application Profile.

B.3.3.1 Additional Keys

Table B.3-2 specifies the type of Directory Records that shall be supported and the additional associated keys. Refer to the Basic Directory IOD in PS3.3.

Table B.3-2STD-XA1K Additional DICOMDIR Keys

Key Attribute Tag Directory Record Level Type Notes
Patient’s Birth Date (0010,0030) PATIENT 2
Patient’s Sex (0010,0040) PATIENT 2
Institution Name (0008,0080) SERIES 2
Institution Address (0008,0081) SERIES 2
Performing Physicians’ Name (0008,1050) SERIES 2
Icon Image Sequence (0088,0200) IMAGE 1
Image Type (0008,0008) IMAGE 1C Required if the SOP Instance referenced by the Directory Record is an XA Image.
Calibration Image (0050,0004) IMAGE 2
Referenced Image Sequence (0008,1140) IMAGE 1C Required if the SOP Instance referenced by the Directory Record is an XA Image and has an Image Type (0008,0008) value 3 of BIPLANE A or BIPLANE B.
>Referenced SOP Class UID (0008,1150) IMAGE 1C Required if Referenced Image Sequence (0008,1140) is present
>Referenced SOP Instance UID (0008,1155) IMAGE 1C Required if Referenced Image Sequence (0008,1140) is present
Lossy image Compression Ratio (0028,2112) IMAGE 1C Required if present in image object with a non-zero length value.

B.3.3.2 Icon Images

Directory Records of type IMAGE shall include Icon Images. The icon pixel data shall be Bits Allocated and Bits Stored (0028,0101)attribute values of 8 with Row (0028,0010) and Column (0028,0011) attribute values of 128 and Photometric Interpretation (0028,0004) attribute value of MONOCHROME2.

Notes: 1. It is recommended that the Icon Images be encoding using VR OB encoding. The use of OW, allowed by the STD-XABC-CD Basic Cardiac profile defined in PS 3.11 Annex A, is deprecated, and may be retired in future versions of the standard.

2. This icon size is larger than that recommended in PS 3.10 because the 64x64 icon would not be clinically useful for identifying and selecting x-ray angiographic images.

3. For multi-frame images, it is recommended that the icon image be derived from the frame identified in the Representative Frame Number attribute (0028,6010), if defined for the image SOP Instance. If the Representative Frame Number is not present, a frame approximately one-third of the way through the multi-frame image should be selected. The process to reduce any image to a 128x128 image is beyond the scope of this standard.