PS3.5 DICOM PS3.5 2016c2016d - Data Structures and Encoding Page 2 PS3.5: DICOM PS3.5 2016c2016d - Data Structures and Encoding Copyright © 2016 NEMA - Standard - DICOM PS3.5 2016c2016d - Data Structures and Encoding Page 3 Table of Contents Notice and Disclaimer ........................................................................................................................................... 11 Foreword ............................................................................................................................................................ 13 1. Scope and Field of Application ............................................................................................................................. 15 2. Normative References ....................................................................................................................................... 17 3. Definitions ....................................................................................................................................................... 21 3.1. Reference Model Definitions ......................................................................................................................... 21 3.2. ACSE Service Definitions ............................................................................................................................. 21 3.3. Presentation Service Definitions .................................................................................................................... 21 3.4. Object Identification Definitions ...................................................................................................................... 21 3.5. DICOM Introduction and Overview Definitions .................................................................................................. 21 3.6. DICOM Conformance Definitions ................................................................................................................... 21 3.7. DICOM Information Object Definitions ............................................................................................................. 21 3.8. DICOM Service Class Specifications Definitions ............................................................................................... 22 3.9. DICOM Network Communication Support For Message Exchange Definitions ......................................................... 22 3.10. DICOM Data Structures and Encoding Definitions ........................................................................................... 22 3.11. Character Handling Definitions .................................................................................................................... 24 4. Symbols and Abbreviations ................................................................................................................................. 25 5. Conventions ..................................................................................................................................................... 27 6. Value Encoding ................................................................................................................................................ 29 6.1. Support of Character Repertoires ................................................................................................................... 29 6.1.1. Representation of Encoded Character Values ............................................................................................ 29 6.1.2. Graphic Characters .............................................................................................................................. 30 6.1.2.1. Default Character Repertoire ........................................................................................................... 30 6.1.2.2. Extension or Replacement of the Default Character Repertoire ............................................................... 30 6.1.2.3. Encoding of Character Repertoires .................................................................................................... 31 6.1.2.4. Code Extension Techniques ............................................................................................................ 32 6.1.2.5. Usage of Code Extension ................................................................................................................ 32 6.1.2.5.1. Assumed Initial States .............................................................................................................. 32 6.1.2.5.2. Restrictions for Code Extension ................................................................................................. 33 6.1.2.5.3. Requirements ......................................................................................................................... 33 6.1.2.5.4. Levels of Implementation and Initial Designation ............................................................................ 33 6.1.3. Control Characters ............................................................................................................................... 34 6.2. Value Representation (VR) ........................................................................................................................... 35 6.2.1. Person Name (PN) Value Representation ................................................................................................. 43 6.2.1.1. Examples of PN VR and Notes ......................................................................................................... 43 6.2.1.2. Ideographic and Phonetic Characters in Data Elements with VR of PN ..................................................... 44 6.2.2. Unknown (UN) Value Representation ....................................................................................................... 44 6.2.3. URI/URL (UR) Value Representation ....................................................................................................... 45 6.3. Enumerated Values and Defined Terms .......................................................................................................... 45 6.4. Value Multiplicity (VM) and Delimitation ........................................................................................................... 46 7. The Data Set .................................................................................................................................................... 47 7.1. Data Elements ........................................................................................................................................... 47 7.1.1. Data Element Fields ............................................................................................................................. 48 7.1.2. Data Element Structure with Explicit VR .................................................................................................... 48 7.1.3. Data Element Structure with Implicit VR .................................................................................................... 49 7.2. Group Length ............................................................................................................................................ 50 7.3. Little Endian Byte Ordering ........................................................................................................................... 50 7.4. Data Element Type ..................................................................................................................................... 51 7.4.1. Type 1 Required Data Elements .............................................................................................................. 51 7.4.2. Type 1C Conditional Data Elements ......................................................................................................... 51 7.4.3. Type 2 Required Data Elements .............................................................................................................. 51 7.4.4. Type 2C Conditional Data Elements ......................................................................................................... 51 7.4.5. Type 3 Optional Data Elements ............................................................................................................... 52 7.4.6. Data Element Types Within A Sequence ................................................................................................... 52 7.5. Nesting of Data Sets ................................................................................................................................... 52 7.5.1. Item Encoding Rules ............................................................................................................................. 53 7.5.2. Delimitation of The Sequence of Items ..................................................................................................... 53 - Standard - Page 4 DICOM PS3.5 2016c2016d - Data Structures and Encoding 7.5.3. Sequence Inheritance ........................................................................................................................... 55 7.6. Repeating Groups ...................................................................................................................................... 55 7.7. Retired Data Elements ................................................................................................................................. 55 7.8. Private Data Elements ................................................................................................................................