DICOM (Digital Imaging and Communications in Medicine) Standard
Here are pdf files with description of DICOM standard:
07_01pu.pdf : PS 3.1: Introduction and Overview
07_02pu.pdf : PS 3.2: Conformance
07_03pu.pdf : PS 3.3: Information Object Definitions
07_04pu.pdf : PS 3.4: Service Class Specifications
07_05pu.pdf : PS 3.5: Data Structure and Encoding
07_06pu.pdf : PS 3.6: Data Dictionary
07_07pu.pdf : PS 3.7: Message Exchange
07_08pu.pdf : PS 3.8: Network Communication Support for Message Exchange
07_10pu.pdf : PS 3.10: Media Storage and File Format for Data Interchange
07_11pu.pdf : PS 3.11: Media Storage Application Profiles
07_12pu.pdf : PS 3.12: Storage Functions and Media Formats for Data Interchange
07_14pu.pdf : PS 3.14: Grayscale Standard Display Function
07_15pu.pdf : PS 3.15: Security and System Management Profiles
07_16pu.pdf : PS 3.16: Content Mapping Resource
07_17pu.pdf : PS 3.17: Explanatory Information
07_18pu.pdf : PS 3.18: Web Access to DICOM Persistent Objects (WADO)