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 transcript:

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 CONTRAST STRETCHING HISTOGRAM MODIFICATION HISTOGRAM STRETCHING MOST COMMON IMAGE PROCESSING TECHNIQUE IN CT

CONTRAST MANIPULATION

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

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

WW – 2000, WL 0 CT # CT # MIDPOINT - O

WINDOW WIDTH WW

CT # RANGES VARY IN SCANNERS TO TO

WW & WL WW

WW & WL WW

WW & WL WW

WW MANIPULATION LUNGLIVERPELVIS NARROW WW LUNG LIVERPELVIS

WW MANIPULATION LUNGLIVERPELVIS MEDIUM WW LUNGLIVERPELVIS

WW MANIPULATION LUNGLIVERPELVIS WIDE WW LUNGLIVERPELVIS

WL MANIPULATION LUNGLIVER PELVIS WL

WL MANIPULATION LUNGLIVER PELVIS WL

WL MANIPULATION LUNGLIVER PELVIS WL

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

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

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

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

WL 0, WW –1,

WL +100, WW

WL -100, WW

WW – WL –

WW – WL –

WW – WL –

WW – WL –

WW – WL –

WW – WL –

WW – WL –

WW – WL –

WW – WL –

WW – WL – -600 TO

WW – WL –

WW – WL –

WW – WL –

WW – WL –

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

VISUALIZATION TOOLS MULTIPLE WINDOWS

IMAGE MAGNIFICATION

DISTANCE AND ANGLE

COORDINATES

HIGHLIGHTING

CT HISTOGRAM

ROI

ROI AND MAGNIFICATION