Archival and Communication of DICOM Images on a Hospital Network

Sheikh Mahmood H.M

School of Biomedical Engineering

IIT - Bombay

Workflow related to Images

CT, MR, US

Printing of Image on film

Radiologist

Radiologist

Digital mages

Printing of Image on film

Referring

Physician

 CT UltrasoundMRI Laser Scanner

Image Database

Workstation Workstation

Picture Archiving and Communication System

Review-station Review-station

   

Problems encountered

Difficult to install and maintain Platform (and vendor) dependent Close system

ACR-NEMA

American College of Radiologists

National Electrical Manufacturers' Association

DICOM – Digital Imaging and Communication in Medicine

DICOM: Digital Imaging and Communication in Medicine

Specifies a non-proprietary data interchange protocol and image format for medical images and image related information.

The information is modeled with entity-relationship (E-R) model

DICOM Data

Information Object Definition (IOD) - A data abstraction of a class of real-world objects

DICOM Message Service Element (DIMSE) - The set of DICOM Application Layer communication services.

DIMSE Service Group (DSG) - A subset of the full DIMSE services which is applicable to a specific IOD

Service Object Pair (SOP) = IOD + DSG

DICOM Information Model Service ClassSpecification

specifies related

applied to an

defined as

Service Group Information ObjectDefinition

is a group of contains

DIMSE Services

 Attributes

SOP Class(es)

  

           

Attribute (data element) – The functional unit of DICOM

The Attribute includes :

A tag that identifies the element,

Value Representation that describes how the value field to follow is represented

The length field that gives the length of the value field that follows

The Value field that contains the value to be transmitted

DICOM Toolkit

Imagectn – Implements DICOM Image Archive

Application Entity (Title, host, port)

Storage

Query

Retrieval

Imagectn

Accepts SOP classes of storage service class and

Query/Retrieve service class Maintains Database Never exits

Storescu

Implements SCU for storage service class Connects storage SCP

Findscu

Implements SCU for Query/Retrieve service class

Supports querying, using C-FIND

Movescu

Implements SCU for Query/Retrieve service class (uses C-MOVE) and

SCP for storage service class Configuration of storage areas

 STA_STORE DATA LTA_STORE BASE   IMAGECTN 

STORESCP  SCP for FINDSCU SCU for MOVESCU 

 MED1

 MED1

ORTHO1

ORTHO1

ORTHO2

ORTHO2

 MED2

 MED2

EMERGENCYEMER

GENCY OT OT

                                

 

 

 

ServiceClass User:C-FINDC-MOVEC-GET

ServiceClass User:C-FINDC-MOVEC-GET

Service Class Provider:C-FIND, C-MOVE, C-GET Service Class User:C-FIND, C-MOVE, C-GET Service Class Provider:C-STORE Service class User:C-STORE

Service Class Provider:C-FIND, C-MOVE, C-GET Service Class User:C-FIND, C-MOVE, C-GET Service Class Provider:C-STORE Service class User:C-STORE

Service Class Provider:C-FIND, C-MOVE, C-GET Service Class Provider:C-STORE

DICOM Client

DICOM Archive    

Image Server 

    

WWW Interface to DICOM Archive

Using Existing PCs Familiarity and User Friendly Platform Independence

Display medical images on a web browserLoad DICOM files from the InternetPerform various Image manipulationsBuild a user-friendly interface

HTTP

Server

CGI

DCMTK

Client

DICOM

Server

DICOM

Archive

HTTP

DICOM

patientQuery showImage moveSeries

moveStudy studyQuerypatientStudies

HTTP

DICOM CLIENT

DICOM SERVER

IMAGE ARCHIVE

DICOM

Output Files

DICOM

CGI

Conclusion

DicomAccess

Image Format Conversion

Radiology Teaching Files