1 / 40

DIGITAL RADIOGRAPHY

DIGITAL PROJECTION RADIOGRAPHY DEPENDS ON COMPUTER TECHNOLOGY TO PRODUCE DIGITAL RADIOGRAPHIC IMAGE. DIGITAL RADIOGRAPHY. REFERS TO THE USE OF DETECTORS THAT CONVERT X-RAY ENERGY TO ELECTRICAL ENERGY THAT IS DELIVERED TO A COMPUTER WHERE THE ANATOMICAL IMAGE IS DIGITALLY PROCESSED AND DISPLAYED. . D

soo
Télécharger la présentation

DIGITAL RADIOGRAPHY

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


    1. DIGITAL RADIOGRAPHY

    2. DIGITAL PROJECTION RADIOGRAPHY DEPENDS ON COMPUTER TECHNOLOGY TO PRODUCE DIGITAL RADIOGRAPHIC IMAGE

    3. DIGITAL RADIOGRAPHY REFERS TO THE USE OF DETECTORS THAT CONVERT X-RAY ENERGY TO ELECTRICAL ENERGY THAT IS DELIVERED TO A COMPUTER WHERE THE ANATOMICAL IMAGE IS DIGITALLY PROCESSED AND DISPLAYED.

    4. DIGITAL RADIOGRAPHY vs COMPUTED RADIOGRAPHY

    5. DR

    6. CR

    8. ELECTRONIC DETECTORS INDIRECT TECHNIQUE CLASS DIRECT TECHNIQUE CLASS

    9. INDIRECT TECHNIQUE INDIRECT CONVERSION FLAT PANEL DETECTORS INDIRECT CONVERSION CHARGED COUPLE DEVICE DETECTORS

    10. INDIRECT CONVERSION FLAT PANEL DETECTORS USE THIN LAYERS OF SILICON COMBINED WITH THE ARRAYS OF PHOTODIODES. P.D. IS COATED WITH CESIUM IODIDE OR RARE EARTH MATERIAL- WHEN STRUCK BY REMNANT X-RAYS THEY EMIT LIGHT.

    11. PHOTODIODE

    13. INDIRECT CONVERSION CHARGE COUPLED DEVICE DETECTORS USE CCD ARRAYS TO RECORD THE VISIBLE LIGHT EMITTED BY A SCINTILLATION CRYSTAL THAT HAS ABSORBED THE ENERGY. AN OPTICAL COUPLING SYSTEM DEMAGNIFIES THIS LIGHT AND SENDS IT TO THE CCD ARRAY.

    14. OPTICAL COUPLING

    15. CCD

    16. DIRECT TECHNIQUE DIRECT CONVERSION FLAT PANEL DETECTORS

    17. DIRECT CONVERSION FLAT PANEL DETECTORS USE AN AMORPHOUS SELENIUM COATED THIN FILM TRANSISTOR ARRAY THAT DIRECTLY CONVERTS X-RAY ENERGY INTO ELECTRICAL SIGNAL. REMNANT X-RAYS ARE ABSORBED IN THE SELENIUM WHERE THEY FORM ELECTRON-HOLES. CAPACITORS COLLECT THE CHARGE.

    19. DR vs CR COMPARISON IMMEDIATE REDOUT CASSETTE FREE OPERATION GOOD FOR HIGH VOLUME RADIOGRAPHY CAN BE USED FOR MAMMOGRAPHY DETECTORS CAN BE RE-EXPOSED IMMEDIATELY MORE EXPENSIVE CAN NOT BE USED IN PORTABLE RADIOGRAPHY?????? NOT COMPATIBLE WITH EXISTING TABLES

    21. PORTABLE????

    22. PORTABLE CT???!!

    24. MONITORS IN DR 1K 2K 4K 1,000 X 1,000 PIXELS 2,000 X 2,000 PIXELS 4,000 X 4,000 PIXELS

    25. DR TERMS TO KNOW PIXEL VOXEL SPATIAL RESOLUTION DYNAMIC RANGE CONTRAST RESOLUTION IMAGE NOISE

    26. PIXEL

    27. VOXEL

    30. CONTRAST RESOLUTION ABILITY OF A SYSTEM TO RESOLVE ADJACENT STRUCTURES HAVING SIMILAR MASS DENSITY

    31. NOISE

    33. High SNR, or low system noise, is therefore key to capturing the greatest proportion of useful image information

    34. QDE

    35. DYNAMIC RANGE

    36. DIGITAL IMAGE POSTPROCESSING WINDOWING EDGE ENHANCEMENT IMAGE STITCHING DYNAMIC RANGE CONTROL

    37. WINDOWING

    38. EDGE ENHANCEMENT

    39. IMAGE STITCHING

    40. IMAGE INVERSION

More Related