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Printable Handouts
Navigable Slide Index
- Introduction
- First vs. modern CT scanner
- Images from first and modern CT scanners
- Modern CT scanners - 4 major venders
- What does CT measure?
- Fan-beam geometry
- Spiral CT principle
- Definition of the spiral pitch value
- Demands on X-ray sources
- Tube technology
- Demands on CT detector technology
- Multi-row detectors for multi-slice-CT 2008/2009
- Single and double detector modules
- Sinogram data
- Image reconstruction
- Data completeness
- Filtered backprojection (FBP)
- Backprojection: examples
- Spiral z-interpolation for single-slice CT
- Importance of z-interpolation
- The cone-beam problem
- Advanced single-slice rebinning (ASSR)
- The ASSR algorithm
- Patient images with ASSR
- The pitch value
- Motion artifacts of the heart
- Imaging the heart with CT
- Retrospective vs. prospective gating
- Synchronization with the heart phase
- Cardiac CT is phase-selective
- 4 dimensions display of the human heart
- Image of prospective gating scan
- Multi-threaded CT scanners and dual-source-CT
- Image of retrospective gating scan
- Coronary artery scan without motion artifacts
- Dual source CT scan
- Image quality and dose
- What is displayed in CT images?
- The 'window technique'
- Spatial resolution (1)
- Spatial resolution (2)
- Spatial resolution (3)
- Image noise
- Patient dose in CT
- Dependencies of IQ and dose
- Strategies for dose reduction
- Reconstruct thin but view thick (1)
- Reconstruct thin but view thick (2)
- Tube current modulation
- Dose reduction by tube current modulation
- Multidimensional adaptive filtering - MAF (1)
- Multidimensional adaptive filtering - MAF (2)
- Patient size vs. mAs at constant noise (1)
- Patient size vs. mAs at constant noise (2)
- Thank you
Topics Covered
- Technical basics of clinical X-ray CT
- From single-slice to multi slice
- The CT hardware
- Mechanics
- X-ray source and X-ray detector technology
- Image reconstruction of circular, sequential and spiral CT
- Specific applications
- Dose reduction strategies
Talk Citation
Kachelrieß, M. (2022, January 23). Basics of computed tomography (CT) [Video file]. In The Biomedical & Life Sciences Collection, Henry Stewart Talks. Retrieved December 5, 2024, from https://doi.org/10.69645/UQHE4334.Export Citation (RIS)
Publication History
Financial Disclosures
- Prof. Marc Kachelrieß has not informed HSTalks of any commercial/financial relationship that it is appropriate to disclose.