An elastically compressible phantom material with mechanical and x-ray attenuation properties equivalent to breast tissue

Physics in Medicine and Biology
B D PriceG J Royle

Abstract

We have developed a novel phantom material: a solution of polyvinyl alcohol (PVAL) in ethanol and water, freeze-thawed to produce a solid yet elastically compressible gel. The x-ray attenuation and mechanical properties of these gels are compared with published measurements of breast tissue. Gels with PVAL concentrations from 5 to 20% w/v were produced. The linear x-ray attenuation coefficients of these gels range from 0.76 to 0.86 cm(-1) at 17.5 keV, increasing with PVAL concentration. These values are very similar to the published values of breast tissue at this energy, 0.8-0.9 cm(-1). Under compression cancerous breast tissue is approximately ten times stiffer than healthy breast tissue. The Young's moduli of the gels increase with PVAL concentration. Varying the PVAL concentration from 7.5 to 20% w/v produces gels with Young's moduli from 20 to 220 kPa at 15% strain. These values are characteristic of normal and cancerous breast tissue, respectively.

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Citations

Feb 11, 2016·Biomechanics and Modeling in Mechanobiology·Nilza G RamiãoDiana C Santos
Jun 23, 2015·Skin Research and Technology : Official Journal of International Society for Bioengineering and the Skin (ISBS) [and] International Society for Digital Imaging of Skin (ISDIS) [and] International Society for Skin Imaging (ISSI)·A K DąbrowskaR M Rossi
Jun 9, 2015·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Henal PatelLeonard Kim
Dec 27, 2019·Journal of Biomaterials Applications·Ana M Teixeira, Pedro Martins

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