ARRS 2022 Abstracts

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E2059. A Video-Based Learning Tool for Understanding Restricted Diffusion
Authors
  1. Shan Sivanushanthan; Georgetown University School of Medicine
  2. Nikita Deshpande; Georgetown University School of Medicine
  3. Harry Tsou; Georgetown University School of Medicine
  4. Erini Makariou; Georgetown University School of Medicine
Background
Understanding the physics and radiological applications of diffusion weighted MRI sequences can be a difficult task for students and residents. Mastering this knowledge is crucial in making important radiologic diagnoses and understanding clinical correlations. Visual signs are known to draw attention during the learning process, and video is one of the most effective tools in providing visual cues. A video-based approach to learning fundamental physics principles underlying DWI should help trainees master theoretical knowledge and apply it to a clinical setting.

Educational Goals / Teaching Points
The primary educational goal is to demonstrate the different causes of restricted diffusion, and to use easy-to-understand analogies presented in video format to highlight the pathophysiology of the different causes of restricted diffusion.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
The different causes of restricted diffusion, including but not limited to stroke, increased cellularity, and infection will be shown, with an emphasis on how these pathological states arise and create their characteristic patterns of restricted diffusion on imaging.

Conclusion
MRI is often viewed by trainees as a confusing imaging modality due to the variety of sequences and subtle differences between them. Having a basic understanding of the physics behind DWI and ADC, and how this manifests in imaging findings, can demystify these sequences and allow trainees to quickly and correctly develop differential diagnoses of restricted diffusion.