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DICOM Configuration. Robert Horn, Agfa Corporation. Supplement 67. Existing Industry Protocols NTP (Network Time Protocol) DHCP (Dynamic Host Configuration Protocol) DNS (Domain Name System) LDAP (Lightweight Directory Access Protocol) Existing Configuration Tools

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dicom configuration

DICOM Configuration

Robert Horn, Agfa Corporation

supplement 67
Supplement 67
  • Existing Industry Protocols
    • NTP (Network Time Protocol)
    • DHCP (Dynamic Host Configuration Protocol)
    • DNS (Domain Name System)
    • LDAP (Lightweight Directory Access Protocol)
  • Existing Configuration Tools
  • Existing support databases
  • DICOM specific information model for LDAP databases
dicom configuration goals
DICOM Configuration Goals
  • Support New Functions
    • Security and Privacy
    • Synchronized Multi-device Acquisitions
  • Reduce Operational Costs
    • Network Administration
    • AE-Title management
    • Service location management
    • Feature location management
time synchronization
Time Synchronization
  • For
    • Multi-device simultaneous acquisitions
      • Cardiac Catheterization laboratory
    • Coordination
      • Security Logs, Procedure Logs
    • Convenience
synchronization specification
Synchronization Specification
  • Specify error relative to time reference(s)
  • Acceptable absolute time error (relative to UTC)
      • o( 1s ) security logs
      • o( 100s ) cardiac catheterization
  • Acceptable synchronization error within a Time Source (0018,1801) (relative to local source)
      • o( 1s ) security logs
      • o( 10ms) cardiac catheterization (a few percent of one cycle of a rapidly beating heart).
ntp network time protocol
NTP - Network Time Protocol
  • Widely available
  • Suitable for both low precision time and high precision time synchronization
  • SNTP (Simple NTP) clients for low precision and limited capability systems.
  • Extensively documented and explained on www.ntp.org
accuracy capability of ntp
Accuracy capability of NTP
  • o(1s) Either client (NTP,SNTP), network capable OS, Internet, GPS, or radio connection
  • o(250ms) NTP client, interrupt driven OS, NTP clock controls
  • o(100ms) local network topology
  • o(10ms) OS clock, OS design
  • o(1 ms) OS/application design, network topology
  • o(100 us) Hardware assist, OS/application design
  • o(10 us) Instrumentation clock, custom OS
  • o(1 us) Atomic clock, extensive hardware assist
how ntp works
How NTP works


Time Sent (Ta)


Time Query Received (Ti)

Time Response Sent (Tj)

Current Time Parameters (TP)

Redundant Servers

NTP Server

Client Provides

Old Network Parameters

Old Time Parameters



Mathematical Magic happens

Client Sets and Fine TunesSystem Clock

SNTP performs only the clock setting

NTP includes the network delay estimation,

optimal estimation mathematics and

fine tuning of the system clock.

NTP Client

NTP clients may utilize redundant servers

NTP clients may utilize instrumentation grade

pulse generators (e.g. Atomic Clocks)

typical ntp configurations
Typical NTP configurations


NTP Server

GPS Receiver



NTP Clients

Switching Hub

Local NTP Server

network admin
Network admin
  • DHCP (Dynamic Host Configuration Protocol)
      • Assigns IP address, hostname
      • Informs DNS of assignment
      • Provides routing, NTP, DNS, etc. information to client
  • DNS (Domain Name System)
      • Provides hostname to IP lookup services
      • Provides server location lookup services
  • LDAP (Lightweight Directory Access Protocol)
      • Provides simple information directory services
  • Widely used
  • Support stable IP allocation (needed for transition and legacy equipment)
  • Supports dynamic IP allocation
  • Understood by IT administrators
  • Documents network IP configuration in file
  • Devices only need their "name"
  • Widely used
  • Provides translation from hostname to IP
  • DHCP uses DDNS option to maintain coordination with dynamic IP assignments
  • RR SRV records provide location of LDAP server
  • Widely used (known as Active Directory in Windows)
  • Simple query oriented network database
  • Simple information model. Schema provided as part of Supplement 67.
  • Alternatives examined
    • CIM: very attractive, but a much larger effort to define and implement. Not yet widely used.
    • SNMP, DMTF: interesting but deal with different aspects of network administration and management.
locate ae title internal operation
Locate AE-title (internal operation)

LDAP Server

Where is AE-X

AE-X is at hostname, port


Where is hostname?

DNS Server

Hostname is x.y.z.w



beyond finding ae titles
Beyond Finding AE-Titles
  • Installation and Network Configuration oriented
  • AE Configuration
    • Obtain new unique AE-Title
    • SOP Classes supported (SCU/SCP, Transfer Syntaxes)
    • IHE Actor
    • Vendor extension
  • Device Configuration
    • Description
    • Vendor extension
    • Hospital extension
pre configured installation
Pre-configured Installation
  • Large network addition
  • Multiple vendors
  • Reduce coordination and scheduling delays
  • Reduce configuration errors
  • Reduce staging requirements
pre configured installation1
Pre-configured Installation

Vendor A Preparation





IT Organization














Vendor B preparation

add another machine
Add another machine

Get IP, hostname, etc.


Install Hardware

Find LDAP Server

Assign Name



Query Configuration

Configure System

Obtain Unique AE Titles

Update Configuration

hospital network reconfiguration
Hospital network reconfiguration

DHCP Server

Shutdown (DHCP)

Revise DHCP Configuration

Resume DHCP

Modify network hardware

Clients Resume

customer assisted maintenance
Customer Assisted Maintenance
  • Simple device swap
  • Remote reconfiguration
  • Local reconfiguration