Table of Contents
Quality Control of CT Scanners
ImPACT
CT scanner testing
CT scanner testing
Quality Control
Quality Control
References and resources
References and resources
What parameters are tested ?
Frequency
Philosophy for quality control
CT quality control
PPT Slide
What phantoms should I use ?
What phantoms should I use ?
What phantoms should I use ?
What phantoms should I use ?
What phantoms should I use ?
Which scan protocols ?
Multi-slice scanners
Multi-slice scanners
Multi-slice scanners
Multi-slice scanners
Multi-slice scanners
Multi-slice scanners
Performance parameters
What parameters are tested ?
Light alignment with scan plane
PPT Slide
PPT Slide
What parameters are tested ?
Phantom alignment
What parameters are tested ?
Phantom alignment
What parameters are tested ?
Image noise
Noise measurements
PPT Slide
Image noise
PPT Slide
Measurement of noise in multi-slice
Measurement of noise in multi-slice
Measurement of noise in multi-slice
Measurement of noise in multi-slice
Measurement of noise in multi-slice
Image noise
Helical multi-slice
Uniformity and artefacts
Phantom size for image noise, uniformity and artefacts
Image noise, uniformity and artefacts
What influences image noise?
Measurement of noise
CT number
CT number and electron density
CT numbers
Measuring Spatial Resolution
Bar patterns
Bar patterns
Edge, wire or bead
Edge, wire or bead
Spatial resolution
Multi-slice spatial resolution
Spatial resolution
Spatial resolution
Imaged slice width (z-sensitivity)
Imaged slice width (z-sensitivity)
Imaged slice width (z-sensitivity)
Imaged slice width (z-sensitivity)
Imaged slice width (z-sensitivity)
Imaged slice width (z-sensitivity)
Imaged slice width (z-sensitivity)
PPT Slide
Multi-slice imaged slice width
Multi-slice imaged slice width
Multi-slice imaged slice width
Imaged slice width: thin slices
Imaged slice width: 16 slice
Cone beam artefacts: 16 slice
Helical imaged slice width
Helical imaged slice width
Helical imaged slice width
What influences imaged slice width ?
Imaged slice width
What parameters are tested ?
CTDI in air
Why measure CTDI?
CTDI in air: accuracy of set-up
Multi-slice scanners
Frequency
Data Records
Dose record (CTDI in air)
Dose record (CTDI in air)
IPEM Report 77
PPT Slide
Measuring the irradiated slice width
Measuring the irradiated slice width
What influences irradiated slice width ?
What parameters are tested ?
Couch distance accuracy: direct measurement
Couch distance accuracy: direct measurement
PPT Slide
Couch movement accuracy : imaging approach
Couch movement accuracy : imaging approach
Couch movement accuracy : imaging approach
Couch movement accuracy : imaging approach
Couch deflection (radiotherapy purposes)
Couch deflection (radiotherapy purposes)
Couch deflection (radiotherapy purposes)
Gantry tilt
What parameters are tested ?
What is not tested ?
Frequency
Scan protocols ?
IPEM 77 Recommendations
AAPM Recommendations
ImPACT Suggestions
Quality Control of CT Scanners
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