teleradiology PowerPoint PPT Presentation

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IntroductionPACSTeleradiology systems: state of the artImage acquisition, display, interpretationImage transmissionNetworksImage compressionLossless image compressionLossy image compressionExamplesThe ACR-NEMA DICOM standardInformation modelling in DICOMNetwork environment support in DICOMConformance in DICOMThe ACR standard for Teleradiology.

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1. Teleradiology C.Ruggiero

2. Introduction PACS Teleradiology systems: state of the art Image acquisition, display, interpretation Image transmission Networks Image compression Lossless image compression Lossy image compression Examples The ACR-NEMA DICOM standard Information modelling in DICOM Network environment support in DICOM Conformance in DICOM The ACR standard for Teleradiology

3. Introduction High band with communication capability - low cost acquisition of medical data in digital form Definition of teleradiology Description of possible applications Key points in teleradiology Teleradiology is the most mature of Telemedicine areas

4. PACS Teleradiology originated from the need to manage images within departments and among departments. Research on Picture Archiving and Communication Systems (PACS) has brought about new capabilities for radiologists Major advantages of PACS

5. Teleradiology systems: state of the art Image acquisition and display Communication networks Image interpretation

6. Image acquisition, display, interpretation Film digitization Computed radiography (CR) CT and MR scanners Frame grabbing Amounts of data to be transmitted

7. Image transmission Networks main aspects to be taken into account Internet ISDN ATM

8. Image transmission Image compression lossless image compression major advanced lossless tecniques: DPCM, HINT, DP, BPE, MAR compression ratios: 1.5:1 - 3:1 lossy image compression growing evidence that lossy compression can be implemented without compromising diagnostic content requirements JPEG, subband coding: wavelets

9. Compression examples

16. The ACR-NEMA DICOM standard Introduction Version 1.0 1985 Version 2.0 Version 3.0 1992/1993 (DICOM) most important innovations with respect to version 1.0 and 2.0: use of information modelling, applicability to a networked environment, conformance

17. The ACR-NEMA DICOM standard Information modelling advantages: reduction of redundancy and ambiguity normalised object classes composite object classes established technique for uniquely identifying any object

18. Network environment support The International Standard Organisation (ISO) has set up a reference model for network communication DICOM fully conforms to ISO Communication protocols specified by DICOM are general purpose (OSI, TCP/IP).

19. Conformance DICOM defines the principles to be met by implementations claiming conformance DICOM specifies levels of conformance

20. In 1994 the ACR has developed a standard for teleradiology This standard defines goals, qualification of personnel, equipement guidelines, licensing, credentialing, liability, communication, quality control and quality improvement

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