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Updated: Aug 5, 2025

Visualization of Ambient Mass Spectrometry with the Use of Schlieren Photography
Published on: June 20, 2016
Characterizing Aerosol Generating Procedures With Background Oriented Schlieren.
N Scott Howard1, Abdulaziz Alrefaie2, Nicholas A Mejia2
1School of Medicine, Case Western Reserve University Otolaryngology, Head and Neck Surgery, University Hospitals Cleveland Medical Center, Cleveland, OH 44106.
Background Oriented Schlieren (BOS) effectively visualized aerosol generating procedures (AGPs) during simulated medical procedures. This flow visualization technique can help evaluate risks in clinical settings.
Area of Science:
- Medical Imaging
- Fluid Dynamics
- Clinical Engineering
Background:
- Aerosol generating procedures (AGPs) pose risks in clinical settings.
- Characterizing AGPs is crucial for infection control.
- Existing visualization methods may have limitations.
Purpose of the Study:
- To investigate the potential of Background Oriented Schlieren (BOS) for characterizing AGPs.
- To evaluate BOS in simulated clinical scenarios.
Main Methods:
- A human-scale BOS system was employed.
- Simulations included jet ventilation and extubation on a manikin.
- Line integral convolution was used for BOS image representation.
Main Results:
- Plumes from simulated AGPs were clearly visualized.
- Both magnitude and direction of the refractive index gradient field were evaluated.
- BOS successfully characterized the aerosol plumes.
Conclusions:
- BOS is a viable tool for visualizing AGPs.
- BOS can aid in risk assessment for clinical procedures.
- Further adaptation of BOS into clinical practice is recommended.

