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Trujillo-Romero CJ, Dionisio Merida J, Ramírez-Guzmán TJ, Martínez-Valdez R, Leija-Salas L, Vera-Hernández A, Rico-Martínez G, Flores-Cuautle JJA, Gutiérrez-Martínez J, Sacristán-Rock E. Thermal Evaluation of Multi-Antenna Systems Proposed to Treat Bone Tumors: Finite Element Analysis. Sensors (Basel) 2022; 22:7604. [PMID: 36236709 PMCID: PMC9571680 DOI: 10.3390/s22197604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 09/28/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
Abstract
Microwave ablation is commonly used in soft tissue tumors, but its application in bone tumors has been barely analyzed. Antennas to treat bone tissue (~3 cm2), has been lately designed. Bone tumors at pathological stage T1 can reach 8 cm wide. An antenna cannot cover it; therefore, our goal is to evaluate the thermal performance of multi-antenna arrays. Linear, triangular, and square configurations of double slot (DS) and monopole (MTM) antennas were evaluated. A parametric study (finite element method), with variations in distance between antennas (ad) and bone thickness (bt) was implemented. Array feasibility was evaluated by SWR, ablated tissue volume, etc. The linear configuration with DS and MTM antennas showed SWR ≤ 1.6 for ad = 1 mm−15 mm and bt = 20 mm−40 mm, and ad = 10 mm−15 mm and bt = 25 mm−40 mm, respectively; the triangular showed SWR ≤ 1.5 for ad = 5 mm−15 mm and bt = 20 mm−40 mm and ad = 10 mm−15 mm and bt = 25 mm−40 mm. The square configuration (DS) generated SWR ≤ 1.5 for ad = 5 mm−20 mm and bt = 20 mm−40 mm, and the MTM, SWR ≤ 1.5 with ad = 10 mm and bt = 25 mm−40 mm. Ablated tissue was 4.65 cm3−10.46 cm3 after 5 min. According to treatment time and array configuration, maximum temperature and ablated tissue is modified. Bone tumors >3 cm3 can be treated by these antenna-arrays.
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Affiliation(s)
- Citlalli Jessica Trujillo-Romero
- Division of Medical Engineering Research, National Institute of Rehabilitation-LGII, Calz. México Xochimilco No. 289, Arenal de Guadalupe, Mexico City 14389, Mexico
| | - Juan Dionisio Merida
- Department of Electrical Engineering, Universidad Autonoma Metropolitana, UAM-Iztapalapa, Av. Ferrocarril San Rafael Atlixco, 186, Leyes de Reforma, Mexico City 09310, Mexico
| | - Texar Javier Ramírez-Guzmán
- Electrical Engineering Department, Bioelectronics Section, CINVESTAV-IPN, Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Mexico City 07360, Mexico
| | - Raquel Martínez-Valdez
- Biomedical Engineering Program, Universidad Politécnica de Chiapas, Suchiapa 29150, Mexico
| | - Lorenzo Leija-Salas
- Electrical Engineering Department, Bioelectronics Section, CINVESTAV-IPN, Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Mexico City 07360, Mexico
| | - Arturo Vera-Hernández
- Electrical Engineering Department, Bioelectronics Section, CINVESTAV-IPN, Instituto Politécnico Nacional 2508, San Pedro Zacatenco, Mexico City 07360, Mexico
| | - Genaro Rico-Martínez
- Bone Tumors Service, National Institute of Rehabilitation-LGII, Calz. México Xochimilco No. 289, Arenal de Guaudalupe, Mexico City 14389, Mexico
| | - José Jesús Agustín Flores-Cuautle
- CONACYT-National Technological Institute of Mexico/I.T. Orizaba, Posgraduate Studies and Research Division, Oriente 9, No. 852, Orizaba 94320, Mexico
| | - Josefina Gutiérrez-Martínez
- Division of Medical Engineering Research, National Institute of Rehabilitation-LGII, Calz. México Xochimilco No. 289, Arenal de Guadalupe, Mexico City 14389, Mexico
| | - Emilio Sacristán-Rock
- National Center for Research in Instrumentation and Medical Imaging, UAM-Iztapalapa, Av. Ferrocarril San Rafael Atlixco, 186, Leyes de Reforma, Mexico City 09310, Mexico
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Martínez-Valdez R, Ramos Fernández A, Vera Hernandez A, Leija Salas L. Design of a low power hybrid HIFU applicator for haemostasis based on acoustic propagation modelling. Int J Hyperthermia 2015; 32:121-31. [PMID: 26708742 DOI: 10.3109/02656736.2015.1112437] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
PURPOSE The aim of this study was to design an applicator for haemostasis usage needing lower acoustic intensities (<880 W/cm(2)) than in previous devices intended for it, which is based on ultrasound propagation FEM modelling using a 2-MHz HIFU transducer. MATERIALS AND METHODS Acoustic field characterisation and numerical simulations in water were performed with and without the proposed applicator. Parameters such as form factor, ellipsoidal shape ratio, and Euclidean distance were used (among others) to compare simulated data with transducer measurements without applicator. A low density polyethylene cone was manufactured from geometries validated from acoustic field modelling. The hollow cone was filled with 10% polyacrylamide gel as a coupling medium with liver phantom or chicken liver. Focal temperature was measured with a thermocouple embedded in the phantom for 1-20 W driving powers for 120 s. Standing wave ratios (SWR) were used as coupling indexes. Ex vivo experimentation in chicken liver was made at 10-20 W. RESULTS Simulated acoustic patterns showed good concordance with measurements. Experimental focal distance was 20.72 ± 0.24 mm, while the simulated was 19.79 mm (≈4% error). SWR at low power were: 2.01 with transducer emitting in air, 1.53 at applicator tip, and 1.35 after phantom placement. Average SWR at high power was 1.31. Similarity of percentages for data comparison in focal plane was over 60%. Maximum temperature measured at focus was 88.7 °C with 20 W after 85 s. CONCLUSIONS Temperatures reached at focus suggest that this applicator has good efficiency, which notably reduces the power typically needed for haemostasis effect.
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Affiliation(s)
- Raquel Martínez-Valdez
- a Department of Electrical Engineering , Bioelectronics Section, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Cinvestav , Mexico City , Mexico , and
| | - Antonio Ramos Fernández
- b R&D Group 'Sistemas y Tecnologías Ultrasónicas', Instituto de Tecnologías Físicas y de la Información , CSIC , Madrid , Spain
| | - Arturo Vera Hernandez
- a Department of Electrical Engineering , Bioelectronics Section, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Cinvestav , Mexico City , Mexico , and
| | - Lorenzo Leija Salas
- a Department of Electrical Engineering , Bioelectronics Section, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional , Cinvestav , Mexico City , Mexico , and
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