7 Persistent Object Types
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# 7 Persistent Object Types

The provisions for some specific object types shall be as defined in this section.

### Note

In all cases the categorization depends on the SOP Class of the objects, enabling a client, or application building an HTML page for the client, to determine in advance of the request what the requirements will be.

## 7.1 Single Frame Image Objects

### 7.1.1 Objects Accessed

In this category are all object instances of SOP classes defined in PS3.3 that consist of a single image frame, instances of multi-frame SOP Classes that contain only one frame, or object instances that consist of single frame accessed from instances of multi-frame SOP Classes using the "frameNumber" parameter.

### 7.1.2 MIME Type Constraints

The Server shall be able to send a response for each of the following MIME types:

- WADO-URI and WADO-WS

  - application/dicom

  - image/jpeg

- WADO-RS

  - application/dicom

  - application/octet-stream

  - application/dicom+xml

  - application/json

If the contentType parameter is not present in the URI or WADO-WS request, the response shall contain an image/jpeg MIME type, if compatible with the 'Accept' field of the GET method. If the contentType parameter is not present in the WADO-RS request, the response is dependent on the 'Accept' field and the requested resource.

When an image/jpeg MIME type is returned, the image shall be encoded using the JPEG baseline lossy 8 bit Huffman encoded non-hierarchical non-sequential process ISO/IEC 10918.

### Note

The choice of image/jpeg as the default for continuous tone images is a consequence of the universal support by Web Clients.

The Server should also support the following MIME types for WADO-URI or WADO-WS:

- image/gif

- image/png

- image/jp2

The Server should also support the following MIME types for WADO-RS:

- image/dicom

- image/dicom+jpeg

- image/dicom+rle

- image/dicom+jpeg-ls

- image/dicom+jp2image/dicom+jpx

The Server may also support other MIME types.

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6.8 RS Capabilities Service | Home | 7.2 Multi-frame and Video Image Objects