The Radiopaedia Reading Room Podcast 71. CT physics update with Michael Nel
Nov 3, 2025
In this lively conversation, Dr. Michael Nel, a radiology educator and author specializing in CT physics, dives deep into iterative reconstruction and dual energy CT. He explains how these advanced techniques enhance image quality and tackle noise. Listeners will also learn about the promising future of photon-counting CT and its practical applications in clinical settings. Alongside some light-hearted tales, including humorous anecdote on edamame, this chat blends cutting-edge science with fun, making it a must-listen for radiology enthusiasts.
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CT Technology Has Rapidly Evolved
- Dual-energy and photon-counting CT are major recent advances that most radiologists didn't learn during training.
- Michael Nel positions these as logical progressions in CT physics worth updating knowledge for.
Clear Ice Project With A Hot-Wire Cutter
- Frank Gaillard described his quest to make clear large ice blocks and a 3D-printed hot-wire cutter.
- He prefers directional freezing and larger cubes to reduce dilution and improve drink aesthetics.
Dual Energy Needs Two Energies, Not Two Tubes
- Dual-energy CT requires two distinct x-ray energies but not necessarily two sources at 90 degrees.
- Different vendor implementations include dual-source, rapid kVp switching, and energy-discriminating detectors.