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Optimal parameters for the efficient microwave ablation of liver tumor from the 3D-IRCADb-01 database

Bošković Nikola, Radjenovic Branislav, Radmilović-Radjenović Marija

Acta of Bioengineering and Biomechanics

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2024

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Vol. 26, no. 1

47--54

EN

Microwave ablation is a minimally invasive thermal modality for cancer treatment with high survival and low recurrence rates. Despite the unquestionable benefits of microwave ablation, the interaction between the medical instruments and the tissue may cause damage to the healthy tissue around the tumor. Such damages can be removed by clarifying the conditions for their development. In addition to clinical methods, computer simulations have become very effective tools for optimizing microwave ablation performance. Methods: The study was focused on the determination of the optimal input power for complete microwave tumor ablation with an adequate safety margin avoiding injury to the surrounding healthy tissue. In three-dimensional simulations, the liver tumor model was based on a real tumor (1.74 cm × 2.40 cm × 1.43 cm) from the 3D-IRCADb-01 database. Calculations were performed for a 10-slot antenna proven to achieve a higher degree of ablation zone localization than a standard single-slot antenna. The temperature-dependent dielectric and thermal properties of healthy and tumoral liver tissue, blood perfusion, and water content were included in the model. Results: The obtained simulation results revealed that the proper choice of input power ensures that necrotic tissue is mainly located in the tumor with minimal damage to the surrounding healthy tissue. Conclusions: This study may represent a step forward in the planning of individual microwave ablation treatment for each patient.

2

3D Simulation of Warp Knitted Structures with a New Algorithm Based on NURBS

Xu H Y, Chen N L, Jiang J H, Jin L X, Wang Z X

Fibres & Textiles in Eastern Europe

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2015

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Vol. 23, no. 1 (109)

57--60

EN

In order to obtain a three-dimensional computer simulation of warp knitted structures with more flexibility and realism, a new algorithm using Matlab was developed by NURBS based on empirical geometrical loop models. With the principles of NURBS curves, once the values of data points are known, the control points with two coincidence points at the start and end points can be uncomplicatedly calculated by Matlab. Then the NURBS curve of a single typical stitch can be simulated flexibly by Matlab. A new typical stitch selected from two stitches simulated directly by the new method is redefined to improve the joint of neighboring stitches, and it is found that there are two types of redefined typical warp knitted stitches judged by whether the two under lap on the same side or not. Based on the redefined typical warp knitted stitch, two warp knitted structures are simulated regardless of the loop offset, and all the joints of stitches are smooth.

PL

Przeprowadzono symulację komputerową struktur dzianin w wymiarze 3D, opracowując w tym celu nową procedurę opartą na algorytmie NURBS. Do tego celu wykorzystano oprogramowanie MATLAB. Symulację 3D przeprowadzono w oparciu o procedury numeryczne umożliwiające wykreślenie przestrzennych figur geometrycznych opisujących strukturę dzianin. Symulowano kształt oczek zamkniętych i otwartych podstawowych splotów kolumienkowych trykotu, sukna i aksamitu. W oparciu o 8 punktów referencyjnych zorientowano konfigurację pętli oczka i łącznika w postaci przestrzennej linii eliptycznej. Do zapisu struktury splotu kształtu oczek wykorzystywano aparat matematyczny w postaci macierzy.

3

Wpływ rozmieszczenia emiterów na ujednorodnienie temperatury w matrycy zbudowanej na bazie szerokoprzerwowych materiałów azotkowych

Kuc M., Brozi A., Sarzała R. P.

Elektronika : konstrukcje, technologie, zastosowania

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2013

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Vol. 54, nr 9

26-29

PL

W pracy przedstawiono wyniki trójwymiarowego modelowania cieplnego matryc zbudowanych na bazie krawędziowego emitera azotkowego. Obliczenia objęły wpływ liczby i szerokości emiterów (3-30 μm), ich ustawienia w matrycach (z i bez diamentowej nakładki w układzie montażowym) na maksymalny przyrost temperatury w przyrządach oraz wielkość efektu wzajemnego nagrzewania się sąsiadujących emiterów.

EN

This paper presents results of our three-dimensional thermal simulation of emitter arrays based on III-Nitride edge-emitting optoelectronic device. An impact of emitter number and width (33-30 μm), emitters location in arrays (with and without diamond heat spreaser) on a maximum temperature rise and thermal crosstalk have been taken into our calculations.