Tissue deformation analysis using a laser based digital image correlation technique

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• 作者：Johannes Kerl ; Tassanai Parittotokkaporn ; Luca Frasson¹ ; Matthew Oldfield ; Ferdinando Rodriguez y Baena ; Frank Beyrau ; ^{f.beyrau@imperial.ac.uk}
• 关键词：Deformation imaging ; Transparent media ; Soft tissue modeling ; Needle insertion
• 刊名：Journal of the Mechanical Behavior of Biomedical Materials
• 出版年：2012
• 出版时间：February, 2012
• 年：2012
• 卷：6
• 期：Complete
• 页码：159-165
• 全文大小：835 K

文摘

A laser based technique for planar time-resolved measurements of tissue deformation in transparent biomedical materials with high spatial resolution is developed. The approach is based on monitoring the displacement of micrometer particles previously embedded into a semi-transparent sample as it is deformed by some form of external loading. The particles are illuminated in a plane inside the tissue material by a thin laser light sheet, and the pattern is continuously recorded by a digital camera. Image analysis yields the locally and temporally resolved sample deformation in the measurement plane without the need for any in situ measurement hardware. The applicability of the method for determination of tissue deformation and material strain during the insertion of a needle probe into a soft material sample is demonstrated by means of an in vitro trial on gelatin.