At first, this article introduces the dicom information model and dicom network protocol architecture; specify the definition of dicom service and object, message data coding, encapsulation of protocol data unite ( pdu ) and the mechanism of message exchange, etc . and then synoptically specifies protocol data unite, presentation data value ( pdv ), encapsulation of various compose items and the class clusters for this program 本文首先介紹了dicom標準信息模型及其網(wǎng)絡(luò)協(xié)議構(gòu)架,并且深入淺出地介紹dicom的服務(wù)和對象定義、消息數(shù)據(jù)編碼、協(xié)議數(shù)據(jù)單元pdu(protocoldataunite)的封裝以及dicom消息的交換機制等基本原理。然后概括說明了模塊中的協(xié)議數(shù)據(jù)單元、表示數(shù)據(jù)值pdv(presentationdatavalue)、各個組成條目的封裝以及在程序中為此定義的類簇。