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IMAGE MANIPULATION. THOSE TECHNIQUES OR PROCESSES WHICH MODIFY AN IMAGE OR GROUP OF IMAGES TO ENHANCE THE VISIBILITY OF USEFUL INFORMATION WHILE SUPPRESSING.

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Presentation on theme: "IMAGE MANIPULATION. THOSE TECHNIQUES OR PROCESSES WHICH MODIFY AN IMAGE OR GROUP OF IMAGES TO ENHANCE THE VISIBILITY OF USEFUL INFORMATION WHILE SUPPRESSING."— Presentation transcript:

1 IMAGE MANIPULATION

2 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 # CT # MIDPOINT - O

9 WINDOW WIDTH WW

10

11

12

13 CT # RANGES VARY IN SCANNERS TO TO

14 WW & WL WW

15 WW & WL WW

16 WW & WL WW

17 WW MANIPULATION LUNGLIVERPELVIS NARROW WW LUNG LIVERPELVIS

18 WW MANIPULATION LUNGLIVERPELVIS MEDIUM WW LUNGLIVERPELVIS

19 WW MANIPULATION LUNGLIVERPELVIS WIDE WW LUNGLIVERPELVIS

20 WL MANIPULATION LUNGLIVER PELVIS WL

21 WL MANIPULATION LUNGLIVER PELVIS WL

22 WL MANIPULATION LUNGLIVER PELVIS WL

23 WW - WIDE FOR TISSUES OF GREATLY DIFFERING ATTENUATION WITHIN THE IMAGE BODY SCANS WW LUNG – WW BONE – 1000 – 2000 WW

24 WW - NARROW FOR DIFFERENT TISSUES OF SIMILAR DENSITIES WITHIN THE IMAGE BRAIN WW LIVER – WW

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

26 CONTRAST vs WW WW CONTRAST MEDIUM WW – CONTRAST OPTIMIZED MEDIUM WW – CONTRAST OPTIMIZED

27 WL 0, WW –1,

28 WL +100, WW

29 WL -100, WW

30 WW – WL –

31 WW – WL –

32 WW – WL –

33 WW – WL –

34 WW – WL –

35 WW – WL –

36 WW – WL –

37 WW – WL –

38 WW – WL –

39 WW – WL – -600 TO

40 WW – WL –

41 WW – WL –

42 WW – WL –

43 WW – WL –

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

45 VISUALIZATION TOOLS MULTIPLE WINDOWS

46 IMAGE MAGNIFICATION

47 DISTANCE AND ANGLE

48 COORDINATES

49 HIGHLIGHTING

50 CT HISTOGRAM

51 ROI

52 ROI AND MAGNIFICATION


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