Subsample interpolation strategies for sensorless freehand 3D ultrasound

Area of Science:

• Medical Imaging
• Ultrasound Technology
• Biomedical Engineering

Background:

• Freehand 3D ultrasound acquisition typically requires position sensors.
• Elevational probe motion can be deduced from speckle decorrelation, but lateral motion tracking is challenging due to sparse sampling.
• Simultaneous lateral and elevational probe motion complicates accurate reconstruction.

Purpose of the Study:

• To investigate the resilience of lateral interpolation techniques under combined lateral and elevational probe motion.
• To propose and evaluate a novel lateral interpolation strategy for freehand 3D ultrasound.

Main Methods:

• Deducing elevational probe motion from interframe speckle decorrelation.
• Investigating subsample interpolation techniques for lateral motion tracking.
• Developing and comparing a novel interpolation strategy against established methods using in vitro experiments.

Main Results:

• Established lateral interpolation techniques show vulnerability to simultaneous lateral and elevational probe motion.
• The proposed novel interpolation strategy demonstrates superior performance.
• Interpolation errors were limited to approximately 5% of the freehand reconstruction length with the new technique.

Conclusions:

• The novel interpolation strategy effectively addresses challenges in freehand 3D ultrasound reconstruction.
• This advancement enhances the accuracy and reliability of sensorless 3D ultrasound imaging.
• The findings have implications for improving diagnostic capabilities in ultrasound applications.