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Dual-frequency ultrasound for detecting and sizing bubbles
Jay C Buckey1, Darin A Knaus, Donna L Alvarenga
1Department of Medicine, Dartmouth Medical School, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03756, USA. jay.buckey@dartmouth.edu
Acta Astronautica
|April 20, 2005
Summary
Dual-frequency ultrasound can detect and size bubbles in the bloodstream transthoracically. This technology could improve safety during space exploration's extensive extravehicular activity (EVA).
Area of Science:
- Biomedical Engineering
- Ultrasound Technology
- Aerospace Medicine
Background:
- Extensive extravehicular activity (EVA) for space missions increases decompression sickness risk.
- Advanced bubble detection is crucial for enhancing EVA safety and efficiency.
Purpose of the Study:
- To evaluate a novel dual-frequency ultrasound device for detecting and sizing intravascular bubbles.
- To assess the feasibility of transcutaneous detection of bubbles in the bloodstream.
Main Methods:
- A dual-frequency ultrasound instrument emitting "pump" and "image" signals was utilized.
- Intravascular bubbles were induced in swine via agitated saline and decompression.
- Transthoracic ultrasound transducers were applied to detect signals in the right atrium.
Main Results:
- Mixing signals indicative of bubbles were successfully detected transthoracically in the right atrium.
- The dual-frequency method enabled the detection and sizing of intravascular bubbles.
- A histogram of estimated bubble sizes was constructed.
Conclusions:
- Dual-frequency ultrasound is a viable method for transthoracic detection and sizing of intravascular bubbles.
- This technology holds promise for monitoring decompression sickness risk in astronauts.
- Improved bubble detection can enhance the safety of extravehicular activity.