:: x-ray ct lecture
This talk was given to students on the Biomedical Science BSc at St George's Hospital. It lasts for two hours, so is quite lengthy, but covers a good range of topics. The slides can be viewed here. Subjects covered are:
- Advantages of CT scanning over planar x-ray
- CT scanning applications
- Construction of a CT scanner
- Principles of tomographic imaging
- Data acquisition
- Back projection
- Filtered back projection
- CT number scale
- CT scanner generations
- Re-binning fan beam data
- X-ray tube
- Beam shaping filter
- X-ray detectors
- Slip rings and helical CT
- Helical interpolation
- Helical pitch
- Advantages of helical scanning
- Data acquisition parameters
- Image reconstruction parameters
- Image noise and contrast
- Factors affecting noise
- Spatial resolution
- Modulation transfer function
- Effective detector width
- Techniques to improve resolution
- Z-sensitivity
- Z-sensitivity and CT number
- Contrast vs spatial resolution
- Radiation dose
- CTDI, weighted CTDI
- Local, organ and effective doses
- Artefacts
- Multi-slice CT
- Advantages of MS CT
- Clinical advantages of MS CT