An experimental characterization of elastographic spatial resolution: Analysis of the trade-offs between spatial resolution and contrast-to-noise ratio
| Autor: | Jonathan Ophir, Seshadri Srinivasan, Raffaella Righetti |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
business.product_category
Materials science Acoustics and Ultrasonics media_common.quotation_subject Biophysics Modulus Models Biological Optics Contrast-to-noise ratio medicine Humans Contrast (vision) Ultrasonics Radiology Nuclear Medicine and imaging Image resolution media_common Radiological and Ultrasound Technology medicine.diagnostic_test Phantoms Imaging business.industry Resolution (electron density) Elasticity Wedge (mechanical device) Nonlinear system Stress Mechanical Elastography business |
| Zdroj: | Ultrasound in Medicine & Biology. 30:1269-1280 |
| ISSN: | 0301-5629 |
| DOI: | 10.1016/j.ultrasmedbio.2004.07.003 |
| Popis: | An experimental study of the spatial resolution in elastography was conducted. Models that involved two cylindrical inclusions arranged as a wedge were used to characterize the axial and lateral resolution of the axial strain elastograms. A study of the dependence of the spatial resolution on several factors such as the algorithmic parameters, the applied strain and the modulus contrast was performed. The axial resolution was found to show a linear dependence with respect to the algorithmic parameters, namely the window length and the window shift used for strain estimation. The lateral resolution showed a weak dependence on the algorithmic parameters. A weak dependence of the spatial resolution on factors such as the modulus contrast and the applied strain was found. The trade-offs between the spatial resolution and the elastographic contrast-to-noise ratio (CNRe) were then analyzed. A nonlinear trade-off between the CNRe and the axial and lateral resolution was shown for conventional strain estimation techniques, with the CNRe improving at a more than linear rate with respect to a linear degradation in the resolution. This study provided an experimental framework for charac- terizing the spatial resolution in elastography and facilitating a comparison of the CNRe with spatial resolution. © 2004 World Federation for Ultrasound in Medicine & Biology. |
| Databáze: | OpenAIRE |
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