DICOM PS3.18 2021b - Web Services


F.1 Introduction to JavaScript Object Notation (JSON)

JSON is a text-based open standard, derived from JavaScript, for representing data structures and associated arrays. It is language-independent, and primarily used for serializing and transmitting lightweight structured data over a network connection. It is described in detail by the Internet Engineering Task Force (IETF) in [RFC4627], available at http://www.ietf.org/rfc/rfc4627.txt.

The DICOM JSON Model complements the XML-based Native DICOM Model, by providing a lightweight representation of data returned by DICOM web services. While this representation can be used to encode any type of DICOM Data Set it is expected to be used by client applications, especially mobile clients, such as described in the QIDO-RS use cases (see Annex HHH “Transition from WADO to RESTful Services (Informative)” in PS3.17).

With the exception of padding to even byte length, a data source that is creating a new instance of a DICOM JSON Model shall follow the DICOM encoding rules in creating Values for the DICOM Attributes within the instance of the DICOM JSON Model. Attribute Values encoded in a DICOM JSON Model are not required to be padded to an even byte length.

A data recipient that converts data from an instance of the DICOM JSON Model back into a binary encoded DICOM object shall adjust the padding to an even byte length as necessary to meet the encoding rules specified in PS3.5.

DICOM PS3.18 2021b - Web Services