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The assessment of the applicability of shear wave elastography in modelling of the mechanical parameters of the liver

Żmudzińska M., Inglot M., Zaleska-Dorobisz U., Jankowski L., Świątek-Najwer E.

Acta of Bioengineering and Biomechanics

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2018

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Vol. 20, no. 4

59--64

EN

The development of haptic technology in laparoscopic simulations indicates a demand of constant upgrade of tactile feedback, which is currently considered to be unsatisfactory. Presumably, one of its causes may be insufficiently examined and described mechanical parameters of soft tissues in vivo, including liver tissue. The aim of the following work was the attempt at assessing the applicability of data from shear wave elastography in organ modelling by correlating the mechanical parameters of the liver obtained by this noninvasive method, with the mechanical parameters obtained by indentation. Methods: Each one out of 12 porcine livers, was subjected to elastography and subsequently to the indentation test. The mean Young’s modulus for each liver lobe was obtained using elastography, while in indentation Young’s moduli in three different strain ranges and maximum load were calculated. Results: Differences between mechanical parameters of lobes were not found but the parameters were calculated for different methods and strain ranges. Conclusions: The limitations of both methods prevent the unambiguous assessment of the applicability of elastography in liver modelling for laparoscopic simulations, at the presented stage of research. Nevertheless, the presented study provides a valuable introduction to the development of a methodology for testing the mechanical parameters of liver tissue.

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Improving surgical precision - application of navigation system in orthopedic surgery

Świątek-Najwer E., Będziński R., Krowicki P., Krysztoforski K., Keppler P, Kozak J.

Acta of Bioengineering and Biomechanics

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2008

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Vol. 10, nr 4

55-62

EN

Navigation systems track objects with precision expressed as root mean square equalling even up to 0.15 mm. Application of navigation system combined with imaging technique makes surgical operations less invasive, which results in the reduced risk of infection, smaller scar and a shorter time of rehabilitation. Imaging techniques allow surgeon to create individual virtual models for virtual surgery planning. Navigation system tracks the positions of surgical tools in relation to the patient's coordinate systems. Medical imaging enables low-invasive surgery, whereas the position of surgical instruments is monitored on screen. The paper presents a newly developed computer-aided surgical system consisting of ultrasonographic probe and tracking system to measure bone geometry, design surgical scenario virtually and follow it intraoperatively. The system assists surgeon to correct bone deformities. The paper presents the results of several accuracy tests, which demonstrate good repeatability and accuracy.

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Navigation systems in orthopaedy

Świątek-Najwer E., Będziński R., Krowicki P., Krzysztoforski K., Kozak J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2006

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z. 26

357-366

EN

Orthopedic surgery requires good precision, which may be provided using navigation systems. Precision of navigation systems is about 0,25 mm. Furthermore application of navigation system enables CT-free surgery planning. Nevertheless there exists a possibility to plan the surgery with CT-scans. In orthopaedy navigation systems are used during hip and knee arthroplasty, osteotomy and anterior crucial ligaments reconstruction.