In computed tomography (CT), a projection is the X-ray image data or attenuation profile captured by the detector from a specific angle. It represents the intensity distribution of X-rays after passing through the specimen, acting effectively as a transmission "shadow."
While a single projection provides a 2D view (in Cone Beam CT) or 1D profile (in Fan Beam CT), a complete CT scan requires acquiring a series of projections while rotating the sample or the source-detector gantry. These accumulated datasets are then processed using reconstruction algorithms to generate cross-sectional images or 3D volume data.
Related Technical Articles
- What are X-rays? (Basic Knowledge)
- Selecting an X-ray Inspection System
- Non-Destructive Testing: Types and Applications
- How to Acquire High-Quality Computed Tomography (CT) Images - X-ray NDT series (1)
- A Guide to X-ray CT Images: Formats, Viewing, and Applications - X-ray NDT series (2)
- X-ray Image Processing and Automated Inspection - X-ray NDT series (3)
- Types of X-ray Tubes and High-voltage Power Supplies
- Principles of Radiography
- Safe Operation of X-ray Inspection Systems
- What is Microfocus X-ray Technology? (Basic Knowledge)
- Understanding Radiation: Effects on the Body and X-ray Safety
- What is the difference between Radioactivity, Radiation, and Radioactive Materials?