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Echo machine-imposed limit on transmitral spectral Doppler velocity-profile analysis
A F Hall1, J Bettlach, S P Nudelman
1Cardiovascular Biophysics Laboratory, Cardiovascular Division, Washington University School of Medicine, St. Louis, MO, USA.
Ultrasound in Medicine & Biology
|January 1, 1997
Summary
This study assessed how ultrasound machine settings affect a ventricular filling model. Results show minor variations in model parameters, ensuring the method
Area of Science:
- Cardiovascular physiology
- Biomedical engineering
- Medical imaging analysis
Background:
- A kinematic model of ventricular filling quantifies filling using transmitral Doppler velocity profiles.
- Model parameter computation may be influenced by ultrasound machine type and settings.
Purpose of the Study:
- To evaluate the impact of ultrasound machine type and settings on kinematic model parameters for ventricular filling.
- To determine the clinical applicability of the Doppler-flow analysis method despite machine-based variations.
Main Methods:
- A flow phantom study was conducted using Acuson and HP echocardiography machines with varied settings.
- Three simulated waveforms were imaged, and maximum velocity envelopes (MVEs) were compared.
- Model fits to MVEs were analyzed to assess parameter variations.
Main Results:
- Both machines produced comparable MVEs, with model fits showing a mean-square difference of 5E-5 (m/s)2.
- Model parameter variations were generally below 6% for two waveforms.
- The shortest duration waveform exhibited 10-15% parameter variation due to a larger error contour.
Conclusions:
- Ultrasound machine type and settings introduce slight variations in model parameters, particularly for shorter waveforms.
- These variations are unlikely to impede the clinical applicability of the Doppler-flow analysis method.
- The method's elimination of observer variability supports its use in clinical practice.