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IMAGE MANIPULATION

IMAGE MANIPULATION. IMAGE MANIPULATION. THOSE TECHNIQUES OR PROCESSES WHICH MODIFY AN IMAGE OR GROUP OF IMAGES TO ENHANCE THE VISIBILITY OF USEFUL INFORMATION WHILE SUPPRESSING NOISE OR NON-USEFUL INFO. WINDOWING. POINT PROCESSING TECHNIQUE. WINDOWING SYNONYMS:. CONTRAST ENHANCEMENT

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IMAGE MANIPULATION

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  1. IMAGE MANIPULATION

  2. IMAGE MANIPULATION • THOSE TECHNIQUES OR PROCESSES WHICH MODIFY AN IMAGE OR GROUP OF IMAGES TO ENHANCE THE VISIBILITY OF USEFUL INFORMATION WHILE SUPPRESSING NOISE OR NON-USEFUL INFO.

  3. WINDOWING • POINT PROCESSING TECHNIQUE

  4. WINDOWING SYNONYMS: • CONTRAST ENHANCEMENT • CONTRAST STRETCHING • HISTOGRAM MODIFICATION • HISTOGRAM STRETCHING MOST COMMON IMAGE PROCESSING TECHNIQUE IN CT

  5. CONTRAST MANIPULATION

  6. WINDOW WIDTH – WW • CONTROLS CONTRAST IN CT LARGE NUMBER – LOW CONTRAST LONG SCALE OF CONTRAST WIDE LATITTUDE

  7. WINDOW LEVEL - WL • CONTROLS DENSITY IN CT LARGE NUMBER – HIGH DENSITY OBJECTS WITH CT# BELOW WL WILL GET DARKER

  8. WW – 2000, WL 0 • CT # 0 + 1000 • CT # 0 - 1000 MIDPOINT - O

  9. WINDOW WIDTH WW WW

  10. CT # RANGES VARY IN SCANNERS • -1000 TO + 3095 • -2048 TO + 6143

  11. WW & WL +3071 -1024 WW

  12. WW & WL +3071 -1024 WW

  13. WW & WL +3071 -1024 WW

  14. WW MANIPULATION LUNG LIVER PELVIS NARROW WW LUNG LIVER PELVIS

  15. WW MANIPULATION LUNG LIVER PELVIS MEDIUM WW LUNG LIVER PELVIS

  16. WW MANIPULATION LUNG LIVER PELVIS WIDE WW LUNG LIVER PELVIS

  17. WL MANIPULATION WL -1000 +1000 PELVIS LUNG LIVER

  18. WL MANIPULATION WL -1000 +1000 PELVIS LUNG LIVER

  19. WL MANIPULATION WL -1000 +1000 PELVIS LUNG LIVER

  20. WW - WIDE • 400- 2000 FOR TISSUES OF GREATLY DIFFERING ATTENUATION WITHIN THE IMAGE BODY SCANS- 350-600 WW LUNG – 1000-2000 WW BONE – 1000 – 2000 WW

  21. WW - NARROW • 50-350 FOR DIFFERENT TISSUES OF SIMILAR DENSITIES WITHIN THE IMAGE BRAIN - 80-150 WW LIVER – 100 - 250 WW

  22. WL – WINDOW LEVEL • SHOULD BE CENTERED NEAR THE AVERAGE ATTENUATION OF THE TISSUES OF INTEREST BODY – 0 TO 60 WL LUNG- -600 TO -800

  23. CONTRAST vs WW • WW CONTRAST • WW CONTRAST • MEDIUM WW – CONTRAST OPTIMIZED

  24. WL 0, WW –1,000 500 500 +500 -500 0 1000

  25. WL +100, WW 800 400 400 +500 -300 +100 800

  26. WL -100, WW 600 300 300 +300 -400 -100 600

  27. WW – 350-600 400 40 WL – 0 - 60

  28. WW – 350-600 400 40 WL – 0 - 60

  29. WW – 350-600 400 40 WL – 0 - 60

  30. WW – 350-600 400 40 WL – 0 - 60

  31. WW – 350-600 600 40 WL – 0 - 60

  32. WW – 350-600 600 40 WL – 0 - 60

  33. WW – 80-150 80 40 WL – 0 - 60

  34. WW – 80-150 140 40 WL – 0 - 60

  35. WW – 80-150 150 60 WL – 0 - 60

  36. WW – 400-2000 1500 -600 WL – -600 TO -750

  37. WW – 400-2000 1500 500 WL – 400-800

  38. WW – 400-2000 1500 500 WL – 400-800

  39. WW – 400-2000 1500 500 WL – 400-800

  40. WW – 400-2000 1500 500 WL – 400-800

  41. DUAL WINDOW DISPLAY • DIFFERENT WW & WL • PROVIDES WELL DEFINED CONTOURS TO SEPARATE TWO DIFFERENT ANATOMICAL AREAS

  42. VISUALIZATION TOOLS • MULTIPLE WINDOWS

  43. IMAGE MAGNIFICATION

  44. DISTANCE AND ANGLE

  45. COORDINATES

  46. HIGHLIGHTING

  47. CT HISTOGRAM

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