IMAGE QUALITY. SPATIAL RESOLUTION CONTRAST RESOLUTION NOISE IMAGE ARTIFACTS RADIATION DOSE.
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Transcript of IMAGE QUALITY. SPATIAL RESOLUTION CONTRAST RESOLUTION NOISE IMAGE ARTIFACTS RADIATION DOSE.
![Page 1: IMAGE QUALITY. SPATIAL RESOLUTION CONTRAST RESOLUTION NOISE IMAGE ARTIFACTS RADIATION DOSE.](https://reader035.fdocuments.net/reader035/viewer/2022062409/56649c935503460f9494fa9f/html5/thumbnails/1.jpg)
IMAGE QUALITY
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SPATIAL RESOLUTION CONTRAST RESOLUTION
NOISE
IMAGE ARTIFACTS
RADIATIONDOSE
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Resolution in CT
Spatial Resolution Contrast Resolution
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SPATIAL RESOLUTION
• DEGREE OF BLURRING IN THE IMAGE
MEASURE OF THE ABILITY TO DISCRIMINATE OBJECTS OF VARYING DENSITY A SMALL DISTANCE APART
AGAINST A UNIFORM BACKGROUND
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MTFMODULATION TRANSFER
FUNCTION
MOST COMMONLY USED TO DESCRIBE SPATIAL RESOLUTION
IN CT
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MTF
• MTF OF 1 – 100% TRANSFER OF OBJECT TO IMAGE
• MTF OF 0 – 0% TRANSFER OF OBJECT TO IMAGE
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HIGH CONTRAST PHANTOM
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FACTORS AFFECTING SPATIAL RESOLUTION
• SLICE THICKNESS
• FOCAL SPOT SIZE
• DETECTOR WIDTH
• TYPE OF CONVOLUTION FILTER (KERNEL)
• MATRIX SIZE
• FOV
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SLICE THICKNESS
SLICE THICKNESS S. RESOLUTION
5 MM 1 MM
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FOCAL SPOT SIZE
FOCAL SPOT SIZE S. RESOLUTION
LARGE FOCAL SPOT = LARGE PENUMBRA (BLURR)
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DETECTOR WIDTH
DETECTOR WIDTH S. RESOLUTION
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TYPE OF CONVOLUTION FILTER
SHARP KERNEL S. RESOLUTION
SMOOTH SHARP
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MATRIX SIZE
MATRIX SIZE S. RESOLUTION
80 X 80 512 X 512
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DFOV SIZE
DFOV S. RESOLUTION
20CM 10CM
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CONTRAST RESOLUTION
• SENSITIVITY OF THE SYSTEM
• LOW CONTRAST RESOLUTION
• LOW CONTRAST DETECTIBILITY
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LOW CONTRAST RESOLUTION
( TISSUE RESOLUTION)
• THE ABILITY OF AN IMAGING SYSTEM TO DEMONSTRATE SMALL CHANGES IN TISSUE CONTRAST
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CONTRAST RESOLUTION
• SENSITIVITY OF THE SYSTEM
• LOW CONTRAST RESOLUTION
• LOW CONTRAST DETECTIBILITY
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CONTRAST RESOLUTION PHANTOM
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FACTORS AFFECTING LOW CONTRAST RESOLUTION
• PHOTON FLUX
• SLICE THICKNESS
• PATIENT SIZE
• DETECTOR SENSITIVITY
• RECONSTRUCTION ALGORITHM
• IMAGE DISPLAY
• QUANTUM NOISE
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PHOTON FLUX (INTENSITY)
PHOTON FLUX C. RESOLUTION
mAs P. FLUXkVp P. FLUX
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LOW TECHNIQUE ADEQUATE TECHNIQUE
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SLICE THICKNESS
SLICE THICKNESS C. RESOLUTION
8 mm 5 mm
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10 mm – 100 PHOTONS 5 mm – 50 PHOTONS
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PATIENT SIZE
PATIENT SIZE C. RESOLUTION
NORMAL LARGE
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DETECTOR SENSITIVITY
DETECTOR SENSITIVITY C. RESOLUTION
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TYPE OF CONVOLUTION FILTER
SMOOTH KERNEL C. RESOLUTION
SMOOTH SHARP
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IMAGE DISPLAY
MONITOR RESOLUTION C. RESOLUTION
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QUANTUM NOISE
QUANTUM NOISE C. RESOLUTION
HIGH NOISE LOW NOISE
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NOISE IN CT
• FLUCTUATION OF CT# BETWEEN POINTS IN THE IMAGE FOR A SCAN OF UNIFORM MATERIAL SUCH WATER.
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NOISE SOURCES IN CT
• QUANTUM NOISE – X-RAY INTENSITY AT THE DETECTORS
• MATRIX SIZE
• DFOV
• SLICE THICKNESS
• CONVOLUTION FILTER TYPE
• PITCH
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QUANTUM NOISE – CONTROLLED BY THE
TECHNOLOGIST
• mA
• Time
• kVp
NOISE
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NOISE
• QUANTUM (STATISTICAL) –CONTROLLED BY THE TECHNOLOGIST
• ELECTRONIC – INHERENT IN THE EQUIPMENT
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QUANTUM NOISE – CONTROLLED BY THE
TECHNOLOGIST
• DFOV
• MATRIX
• COLLIMATION
• FILTER SPATIAL FREQUENCY
• PITCH
NOISE
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DOSE vs
IMAGE QUALITY
• RADIATION DOSE IMAGE QUALITY