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IMAGE GENERATION IN CT
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CT EXAM
• PROTOCOL AND PARAMETERS SELECTION
• PATIENT POSITIONING
• SCANNING
• DATA RECONSTRUCTION
• IMAGE DISPLAY
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PROTOCOL AND TECHNIQUE SELECTION
• PROTOCOL• PARAMETERSSCANNING MODEkVpmATimeRECONSTRUCTIONPATIENT POSITIONPATIENT ORIENTATIONSFOVDFOV
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PROTOCOL
• PEDIATRIC OR ADULT
• HEAD, ABDOMEN, EXTREMITIES
• VASCULAR OR REGULAR
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SCANNING MODE
• AXIAL (SLICE BY SLICE)
• SPIRAL (HELICAL)
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TECHNIQUE
• kVp
• mA
• time
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RECONSTRUCTION
• SECTION THICKNESS
• SECTION INDEX
• ALGORITHM
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PATIENT POSITION
• SUPINE OR PRONE
• BODY PART UNDER SCRUTINY MUST BE PLACED IN THE ISOCENTER OF THE SCANNER
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PATIENT ORIENTATION• HEAD FIRST • FEET FIRST
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SFOV SCANNING FIELD OF VIEW
(CALLIBRATION FIELD OF VIEW)
• AREA WITHIN THE GANTRY’S ISOCENTER FROM WHICH THE RAW DATA IS ACQUIRED DURING THE SCAN. IT DEPENDS ON THE NUMBER OF DETECTORS ACTIVATED TO COLLECT DATA.
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LARGE SFOV
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SMALL SFOV
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SMALL SFOV SFOV
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LARGE SFOVSFOV
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CHOOSE THE SMALLEST SFOV THAT WOULD
ACCOMMODATE BODY PART FOR BEST RESOLUTION
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IF BODY PART LIES OUTSIDE SFOV NO DATA WILL BE
COLLECTED FOR THAT PART THAT EXTEND BEYOND. IT
ALSO CAUSES OUT OF FIELD ARTIFACT
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OUT OF FIELD ARTIFACT
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DFOV – DISPLAYED FIELD OF VIEW
(ZOOM OR TARGET)
• DETRMINES HOW MUCH RAW DATA FROM WITHIN SFOV WILL BE UTILIZED TO CREATE AN IMAGE.
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SFOV
DFOV
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DISPLAYED FOV vs
SCANNING FOV
• DFOV CAN BE EQUAL OR LESS OF SFOV
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DFOV VS PIXEL SIZE
• SMALL DFOV
• LARGE FOV
• SMALL PIXEL
• LARGE PIXEL
LARGE DFOV
LOW SPATIAL RESOLUTIONLOW VISIBILITY OF DETAIL
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LARGE DFOV
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SMALL DFOV
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DFOV
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DFOV
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PIXEL SIZE
PIXEL SIZE= DFOV (mm)/ MATRIX SIZE
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SAMPLE
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SCANNING
• TOPOGRAM
• REGULAR SCAN
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TOPOGRAM (SCOUT)
• TUBE DOES NOT REVOLVE AROUND THE PATIENT
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AP SCOUT
• TUBE SUSPENDED ABOVE PATIENT DURING SCOUT GENERATION
TUBE
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LAT SCOUT
• TUBE AT THE 90º ANGLE TO PATIENT
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REGULAR SCAN
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I, II, AND III GENERATION
• CONTINUOUS DATA ACQUSITION GEOMETRY
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IV GENERATION
• STATIONARY DATA ACQUSITION GEOMETRY
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REGULAR SCAN
• AXIAL (CONVENTIONAL, SLICE-BY-SLICE)
• SPIRAL
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AXIAL SCAN
• TABLE STOPS AT THE SCANNING POSITION AND THE TUBE ROTATES AROUND A PATIENT.
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SPIRAL
• PATIENT CONTINUOUSLY MOVES IN THE Z-AXIS DIRECTION WHILE THE TUBE ROTATES AROUND.
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TOTAL NUMBER OF TRANMISSION
MEASUREMENTEQUALS
NUMBER OF VIEWS X
NUMBER OF RAYS IN EACH VIEW
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ACQUSITION TERMINOLOGY
• RAY
• VIEW
• PROFILE
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RAY
PART OF THE X-RAY BEAM THAT FALLS ON ONE
DETECTOR
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VIEW
COLLECTION OF THE RAYS FOR ONE TRANSLATION ACROSS
THE OBJECT
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PROFILE
ANALOG SIGNAL GENERATED IN A VIEW
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RAY
PROFILE
VIEW
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RECONSTRUCTION
• DATA THAT HAVE BEEN BACKPROJECTED INTO THE IMAGE MATRIX TO CREATE CT IMAGES DISPLAYED ON THE MONITOR
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RECONSTRUCTION TRANSMISSION MEASUREMENT
(LINEAR ATTENUATION COEFFICIENT) IS CONVERTED INTO CT NUMBER
(HOUNSFIELD UNIT)
Ц CT #RECONSTRUCTION
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LINEAR ATTENUATION COEFFICIENT ( cm-1)
• BONE 0.528• BLOOD 0.208• G. MATTER 0.212• W. MATTER 0.213• CSF 0.207• WATER 0.206• FAT 0.185• AIR 0.0004
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CT NUMBER CALCULATION
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CT NUMBER SCALE
• CORTICAL BONE +1,000• MUSCLE +50 • WHITE MATTER +45• GRAY MATTER +40• BLOOD +20• CSF +15• FAT -100• LUNG -200
• AIR -1,000
• APPEARS WHITE
• GRAY
• LIGHT GRAY
• GRAY
• GRAY
• GRAY
• DARK GRAY TO BLACK
• DARK GRAY TO BLACK
• DARK GRAY TO BLACK
WATER – 0 BASELINE
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CT # vs BRIGHTNESS LEVEL
+ 1000
-1000
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CT #
+500
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CT #+40
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CT #+15
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CT # OF CYST0
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CT # OF LIPOMA ( FATTY TUMOR)
-100
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CT #
-100