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A freehand elastographic imaging approach for clinical breast imaging: system development and performance evaluation
M M Doyley1, J C Bamber, F Fuechsel
1Institute of Cancer Research, Sutton Surrey, UK. marvin.m.doyley@dartmouth.edu
Ultrasound in Medicine & Biology
|December 4, 2001
Summary
A new freehand elastography system for breast imaging shows promising results. This ultrasound technology uses hand movements for deformation, offering comparable strain sensitivity and contrast to mechanical methods, warranting clinical trials.
Area of Science:
- Medical Imaging
- Biomedical Engineering
- Diagnostic Ultrasound
Background:
- Elastography is a valuable tool for breast lesion characterization.
- Existing elastography systems often rely on mechanical compression, which can be cumbersome.
- Freehand techniques offer potential for more adaptable and patient-friendly examinations.
Purpose of the Study:
- To develop and evaluate a prototype freehand elastographic imaging system for clinical breast imaging.
- To assess the performance of hand-induced transducer motion compared to mechanical compression.
Main Methods:
- A fast data acquisition system captured ultrasound echo frames during hand-induced breast deformation.
- Two-dimensional echo tracking, global distortion compensation, and multi-compression averaging were employed.
- Performance was evaluated on gelatine phantoms against mechanically induced motion.
Main Results:
- Freehand elastograms demonstrated favorable strain sensitivity and contrast-to-noise ratio compared to mechanical methods.
- Mechanically induced motion yielded superior dynamic range and signal-to-noise ratio.
- The prototype system achieved sufficient performance despite some loss due to hand-induced stress.
Conclusions:
- The developed prototype freehand elastography system is suitable for clinical breast imaging evaluation.
- Hand-induced elastography offers a viable alternative, though mechanical methods currently provide better signal quality.