710 likes | 1.92k Views
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
E N D
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 vsCOMPUTED 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