B.3 STD-XA1K Application Profile Class Requirements
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## B.3 STD-XA1K Application Profile Class Requirements

### B.3.1 SOP Classes and Transfer Syntaxes

This Application Profile Class is based on the Media Storage Service Class (see PS3.4).

SOP Classes and corresponding Transfer Syntaxes supported by this Application Profile are specified in Table B.3-1.

Table B.3-1. STD-XA1K SOP Classes and Transfer Syntaxes

Information Object Definition | SOP Class UID | Transfer Syntax and UID | FSC Requirement | FSR Requirement | FSU Requirement (see Note 1)
--- | --- | --- | --- | --- | ---
Basic Directory | 1.2.840.10008.1.3.10 | Explicit VR Little Endian Uncompressed 1.2.840.10008.1.2.1 | Mandatory | Mandatory | Mandatory
X-Ray Angiographic Image | 1.2.840.10008.5.1.4.1.1.12.1 | JPEG Lossless Process 14 (selection value 1) 1.2.840.10008.1.2.4.70 | Mandatory | Mandatory | Optional
X-Ray Angiographic Image | 1.2.840.10008.5.1.4.1.1.12.1 | JPEG Lossy, Baseline Sequential with Huffman Coding (Process 1) 1.2.840.10008.1.2.4.50 | Optional for DVD; Disallowed for CD | Mandatory for DVD; Disallowed for CD | Undefined for DVD; Disallowed for CD
X-Ray Angiographic Image | 1.2.840.10008.5.1.4.1.1.12.1 | JPEG Extended (Process 2 & 4): Default Transfer Syntax for Lossy JPEG 12 Bit Image Compression (Process 4 only) 1.2.840.10008.1.2.4.51 | Optional for DVD; Disallowed for CD | Mandatory for DVD; Disallowed for CD | Undefined for DVD; Disallowed for CD
Secondary Capture Image Storage | 1.2.840.10008.5.1.4.1.1.7 | Explicit VR Little Endian Uncompressed 1.2.840.10008.1.2.1 | Optional | Mandatory | Optional
Grayscale Softcopy Presentation State Storage | 1.2.840.10008.5.1.4.1.1.11.1 | Explicit VR Little Endian Uncompressed 1.2.840.10008.1.2.1 | Optional | Optional | Optional

### Note

1. The FSU requirement is not defined for STD-XA1K-DVD profile.

2. The Standalone Overlay, Standalone Curve and Detached Patient management SOP Classes were formerly defined in these profiles, but have been retired. The Grayscale Softcopy Presentation State Storage SOP Class has been added as the preferred mechanism for conveying annotations.

### B.3.2 Physical Media and Media Formats

The 1024 X-Ray Angiographic Application CD-R Profile STD-XA1K-CD requires the 120mm CD-R physical media with the ISO/IEC 9660 Media Format, as defined in PS3.12.

The 1024 X-Ray Angiographic Application DVD profile STD-XA1K-DVD requires any of the 120 mm DVD media other than DVD-RAM as defined in PS3.12.

### 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.3-2. STD-XA1K Additional DICOMDIR Keys

Key Attribute | Tag | Directory Record Type | 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. May be present otherwise.
>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
>All other elements from Referenced Image Sequence (including Purpose of Reference Code Sequence and its content) | IMAGE | 3 |
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.

### Note

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 Annex A, is deprecated, and may be retired in future versions of the standard.

2. This icon size is larger than that recommended in PS3.10 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.

### B.3.4 Other Parameters

This section defines other parameters common to all specific Application Profiles in the STD-XA1K class that need to be specified in order to ensure interoperable media interchange.

#### B.3.4.1 Image Attribute Values

The attributes listed in Table B.3-3 used within the X-Ray Angiographic Image files have the specified values.

Table B.3-3. STD-XA1K Required XA Image Attribute Values

Attribute | Tag | Value
--- | --- | ---
Modality | (0008,0060) | XA
Rows | (0028,0010) | up to 1024 (see below)
Columns | (0028,0011) | up to 1024 (see below)
Bits Stored | (0028,0101) | 8, 10, and 12 bits only

### Note

1. An FSC or FSU, when creating or updating a File-set, Rows or Columns will not exceed a value of 1024. When reading a File-set, an FSR or FSU will accept all values of up to 1024 for Rows or Columns.

2. Photometric Interpretation, Pixel Representation, High Bit, Bits Allocated and Samples per Pixel are defined in the XA IOD.

The attributes listed in Table B.3-4 used within the Secondary Capture Image files have the specified values.

Table B.3-4. STD-XA1K Required SC Image Attribute Values

Attribute | Tag | Value
--- | --- | ---
Rows | (0028,0010) | up to 1024 (see below)
Columns | (0028,0011) | up to 1024 (see below)
Samples per Pixel | (0028,0002) | 1
Photometric Interpretation | (0028,0004) | MONOCHROME2
Bits Allocated | (0028,0100) | 8 bits only
Bits Stored | (0028,0101) | 8 bits only
High Bit | (0028,0102) | 7
Pixel Representation | (0028,0103) | 0000H (unsigned)

### Note

1. An FSC or FSU, when creating or updating a File-set, Rows or Columns will not exceed a value of 1024. When reading a File-set, an FSR or FSU will accept all values of up to 1024 for Rows or Columns.

2. It is recommend that Referenced Image Sequence (0008,1140) be present if the SC Image is significantly related to XA images and frames stored on the same media, and if present, it should contain references to those images and frames.

Overlay Group 60XX shall not be present in Secondary Capture Images, and Standalone Overlays shall not be referenced by or to Secondary Capture Images used in this profile.

#### B.3.4.2 Multi-frame JPEG Format

The JPEG encoding of pixel data shall use Interchange Format (with table specification) for all frames.

#### B.3.4.3 Attribute Value Precedence

Retired.

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