IMAGE MANIPULATION. THOSE TECHNIQUES OR PROCESSES WHICH MODIFY AN IMAGE OR GROUP OF IMAGES TO...

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Transcript of IMAGE MANIPULATION. THOSE TECHNIQUES OR PROCESSES WHICH MODIFY AN IMAGE OR GROUP OF IMAGES TO...

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IMAGE MANIPULATION Slide 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. Slide 3 WINDOWING POINT PROCESSING TECHNIQUE Slide 4 WINDOWING SYNONYMS: CONTRAST ENHANCEMENT CONTRAST STRETCHING HISTOGRAM MODIFICATION HISTOGRAM STRETCHING MOST COMMON IMAGE PROCESSING TECHNIQUE IN CT Slide 5 CONTRAST MANIPULATION Slide 6 WINDOW WIDTH WW CONTROLS CONTRAST IN CT LARGE NUMBER LOW CONTRAST LONG SCALE OF CONTRAST WIDE LATITTUDE Slide 7 WINDOW LEVEL - WL CONTROLS DENSITY IN CT LARGE NUMBER HIGH DENSITY OBJECTS WITH CT# BELOW WL WILL GET DARKER Slide 8 WW 2000, WL 0 CT # 0 + 1000 CT # 0 - 1000 MIDPOINT - O Slide 9 WINDOW WIDTH WW Slide 10 Slide 11 Slide 12 Slide 13 CT # RANGES VARY IN SCANNERS -1000 TO + 3095 -2048 TO + 6143 Slide 14 WW & WL +3071 -1024 WW Slide 15 WW & WL +3071 -1024 WW Slide 16 WW & WL +3071 -1024 WW Slide 17 WW MANIPULATION LUNGLIVERPELVIS NARROW WW LUNG LIVERPELVIS Slide 18 WW MANIPULATION LUNGLIVERPELVIS MEDIUM WW LUNGLIVERPELVIS Slide 19 WW MANIPULATION LUNGLIVERPELVIS WIDE WW LUNGLIVERPELVIS Slide 20 WL MANIPULATION LUNGLIVER PELVIS -1000 +1000 WL Slide 21 WL MANIPULATION LUNGLIVER PELVIS -1000 +1000 WL Slide 22 WL MANIPULATION LUNGLIVER PELVIS -1000 +1000 WL Slide 23 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 Slide 24 WW - NARROW 50-350 FOR DIFFERENT TISSUES OF SIMILAR DENSITIES WITHIN THE IMAGE BRAIN - 80-150 WW LIVER 100 - 250 WW Slide 25 WL WINDOW LEVEL SHOULD BE CENTERED NEAR THE AVERAGE ATTENUATION OF THE TISSUES OF INTEREST BODY 0 TO 60 WL LUNG- -600 TO -800 Slide 26 CONTRAST vs WW WW CONTRAST MEDIUM WW CONTRAST OPTIMIZED MEDIUM WW CONTRAST OPTIMIZED Slide 27 WL 0, WW 1,000 -5000 +500 1000 500 Slide 28 WL +100, WW 800 -300+100 +500 800 400 Slide 29 WL -100, WW 600 -400-100 +300 600 300 Slide 30 WW 350-600 WL 0 - 60 400 40 Slide 31 WW 350-600 WL 0 - 60 400 40 Slide 32 WW 350-600 WL 0 - 60 400 40 Slide 33 WW 350-600 WL 0 - 60 400 40 Slide 34 WW 350-600 WL 0 - 60 600 40 Slide 35 WW 350-600 WL 0 - 60 600 40 Slide 36 WW 80-150 WL 0 - 60 80 40 Slide 37 WW 80-150 WL 0 - 60 140 40 Slide 38 WW 80-150 WL 0 - 60 150 60 Slide 39 WW 400-2000 WL -600 TO -750 1500 -600 Slide 40 WW 400-2000 WL 400-800 1500 500 Slide 41 WW 400-2000 WL 400-800 1500 500 Slide 42 WW 400-2000 WL 400-800 1500 500 Slide 43 WW 400-2000 WL 400-800 1500 500 Slide 44 DUAL WINDOW DISPLAY DIFFERENT WW & WL PROVIDES WELL DEFINED CONTOURS TO SEPARATE TWO DIFFERENT ANATOMICAL AREAS Slide 45 VISUALIZATION TOOLS MULTIPLE WINDOWS Slide 46 IMAGE MAGNIFICATION Slide 47 DISTANCE AND ANGLE Slide 48 COORDINATES Slide 49 HIGHLIGHTING Slide 50 CT HISTOGRAM Slide 51 ROI Slide 52 ROI AND MAGNIFICATION