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A measurement system for continuous wave ultrasound fields
H W Persson1, S O Dymling, N G Holmer
1Department of Electrical Measurements, Lund Institute of Technology, Sweden.
Ultrasound in Medicine & Biology
|January 1, 1991
Summary
A new measurement system using a PVDF hydrophone accurately evaluates ultrasound fields. High sensitivity and spatial resolution are achieved for precise peak intensity measurements, crucial for fetal Doppler equipment.
Area of Science:
- Acoustics
- Biomedical Engineering
- Medical Imaging
Background:
- Accurate measurement of ultrasound fields is essential for medical diagnostic equipment.
- Interference in multi-transmitter systems necessitates high spatial resolution for reliable intensity readings.
Purpose of the Study:
- To present a novel measurement system for evaluating ultrasound fields.
- To demonstrate the system's high sensitivity and spatial resolution capabilities.
Main Methods:
- Utilized a polyvinylidene fluoride (PVDF) hydrophone.
- Employed a mechanical scanning device for precise positioning.
- Implemented a narrow-band technique for continuous wave (CW) ultrasound to enhance sensitivity.
Main Results:
- Successfully recorded the beam profile of an air transducer, demonstrating high sensitivity.
- Obtained recordings from fetal Doppler equipment, highlighting the need for high spatial resolution due to transmitter interference.
Conclusions:
- The developed system provides accurate ultrasound field measurements.
- High spatial resolution is critical for obtaining correct peak intensity values, especially with complex multi-transmitter systems like fetal Doppler devices.