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Human Observer Sensitivity to Temporal Noise During B-Mode Ultrasound Scanning: Characterization and Imaging
Matthew T Huber1, Katelyn M Flint1, Patricia J McNally2
1Department of Biomedical Engineering, Duke University, Durham, NC, USA.
Ultrasonic Imaging
|March 18, 2024
Summary
Expert sonographers could not perceive random temporal noise in ultrasound images above 28 dB signal-to-noise ratio (SNR) at realistic motion levels. This finding helps optimize ultrasound system engineering for better image quality.
Area of Science:
- Medical Imaging
- Acoustics
- Human Factors Engineering
Background:
- Visible noise in ultrasound degrades image quality and diagnostic accuracy.
- Temporal noise, arising from electronic sources, is a key area for engineering improvements.
- Understanding human perception of noise is crucial for optimizing ultrasound systems.
Purpose of the Study:
- To determine the signal-to-noise ratio (SNR) thresholds for temporal noise imperceptibility in ultrasound.
- To assess the impact of motion and imaging frequency on noise perception.
- To inform engineering efforts for noise reduction in ultrasound.
Main Methods:
- An observer study involving five expert sonographers was conducted.
- Sonographers evaluated simulated ultrasound cine clips with and without added temporal noise.
- Paired comparisons were used to identify noise perception thresholds.
Main Results:
- Motion level significantly influenced perceived noise; imaging frequency had minimal impact.
- Temporal noise became imperceptible at SNR levels of 28 dB and above under realistic motion conditions.
- A case study demonstrated adaptive intensity adjustment based on noise thresholds in fetal imaging.
Conclusions:
- Temporal noise perception thresholds provide valuable data for ultrasound system design and tuning.
- These findings can guide engineering to minimize noise impact on image quality.
- Optimizing SNR based on human perception enhances diagnostic confidence in ultrasound scans.
