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A quantitative comparison of modulus images obtained using nanoindentation with strain elastograms.
S Srinivasan1, T Krouskop, J Ophir
1Siemens Ultrasound Division, Siemens Medical Solutions, Mountain View, CA, USA.
Ultrasound in Medicine & Biology
|August 18, 2004
Summary
This study quantifies the relationship between ultrasound elastography strain images and tissue stiffness modulus images. Results show a feasible, intrinsic link, supporting elastography
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Acoustics
Background:
- Tissue stiffness is linked to pathological changes.
- Ultrasound (US) elastography images tissue strain, but its correlation with stiffness needs validation.
Purpose of the Study:
- To quantitatively compare ultrasound elastography strain images with tissue modulus images.
- To evaluate the utility of elastography for imaging tissue stiffness properties.
Main Methods:
- Performed simulations to compare modulus and strain images.
- Compared nanoindenter-based modulus images with strain elastograms of phantoms.
- Qualitatively assessed correspondence in beef, prostate, kidney, and tumor tissues.
Main Results:
- Simulations and experiments confirmed feasibility of quantitative comparison between strain and modulus images.
- Good correlation (>0.8) achieved under specific conditions (scale, contrast, strain, window length).
- Lower correlations observed in phantom (0.5) and real tissue (0.3) experiments due to noise, dimensionality, and tissue properties.
Conclusions:
- An intrinsic relationship exists between strain elastograms and elastic moduli distribution.
- Findings support continued development and application of ultrasound elastography for quantitative stiffness assessment.