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Saha N, Kuehne A, Millward JM, Eigentler TW, Starke L, Waiczies S, Niendorf T. Advanced Radio Frequency Applicators for Thermal Magnetic Resonance Theranostics of Brain Tumors. Cancers (Basel) 2023; 15:cancers15082303. [PMID: 37190232 DOI: 10.3390/cancers15082303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/09/2023] [Accepted: 04/11/2023] [Indexed: 05/17/2023] Open
Abstract
Thermal Magnetic Resonance (ThermalMR) is a theranostic concept that combines diagnostic magnetic resonance imaging (MRI) with targeted thermal therapy in the hyperthermia (HT) range using a radiofrequency (RF) applicator in an integrated system. ThermalMR adds a therapeutic dimension to a diagnostic MRI device. Focused, targeted RF heating of deep-seated brain tumors, accurate non-invasive temperature monitoring and high-resolution MRI are specific requirements of ThermalMR that can be addressed with novel concepts in RF applicator design. This work examines hybrid RF applicator arrays combining loop and self-grounded bow-tie (SGBT) dipole antennas for ThermalMR of brain tumors, at magnetic field strengths of 7.0 T, 9.4 T and 10.5 T. These high-density RF arrays improve the feasible transmission channel count, and provide additional degrees of freedom for RF shimming not afforded by using dipole antennas only, for superior thermal therapy and MRI diagnostics. These improvements are especially relevant for ThermalMR theranostics of deep-seated brain tumors because of the small surface area of the head. ThermalMR RF applicators with the hybrid loop+SGBT dipole design outperformed applicators using dipole-only and loop-only designs, with superior MRI performance and targeted RF heating. Array variants with a horse-shoe configuration covering an arc (270°) around the head avoiding the eyes performed better than designs with 360° coverage, with a 1.3 °C higher temperature rise inside the tumor while sparing healthy tissue. Our EMF and temperature simulations performed on a virtual patient with a clinically realistic intracranial tumor provide a technical foundation for implementation of advanced RF applicators tailored for ThermalMR theranostics of brain tumors.
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Affiliation(s)
- Nandita Saha
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin Ultrahigh Field Facility (B.U.F.F.), 13125 Berlin, Germany
- Charité-Universitätsmedizin Berlin, Experimental and Clinical Research Center (ECRC), A Joint Cooperation between the Charité Medical Faculty and the Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany
| | - Andre Kuehne
- MRI.TOOLS GmbH, 13125 Berlin, Germany
- Brightmind.AI GmbH, 1010 Vienna, Austria
| | - Jason M Millward
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin Ultrahigh Field Facility (B.U.F.F.), 13125 Berlin, Germany
- Charité-Universitätsmedizin Berlin, Experimental and Clinical Research Center (ECRC), A Joint Cooperation between the Charité Medical Faculty and the Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany
| | - Thomas Wilhelm Eigentler
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin Ultrahigh Field Facility (B.U.F.F.), 13125 Berlin, Germany
| | - Ludger Starke
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin Ultrahigh Field Facility (B.U.F.F.), 13125 Berlin, Germany
- Hasso Plattner Institute for Digital Engineering, University of Potsdam, 14482 Potsdam, Germany
| | - Sonia Waiczies
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin Ultrahigh Field Facility (B.U.F.F.), 13125 Berlin, Germany
- Charité-Universitätsmedizin Berlin, Experimental and Clinical Research Center (ECRC), A Joint Cooperation between the Charité Medical Faculty and the Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany
| | - Thoralf Niendorf
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin Ultrahigh Field Facility (B.U.F.F.), 13125 Berlin, Germany
- Charité-Universitätsmedizin Berlin, Experimental and Clinical Research Center (ECRC), A Joint Cooperation between the Charité Medical Faculty and the Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, 13125 Berlin, Germany
- MRI.TOOLS GmbH, 13125 Berlin, Germany
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Bevacqua MT, Gaffoglio R, Bellizzi GG, Righero M, Giordanengo G, Crocco L, Vecchi G, Isernia T. Field and Temperature Shaping for Microwave Hyperthermia: Recent Treatment Planning Tools to Enhance SAR-Based Procedures. Cancers (Basel) 2023; 15:cancers15051560. [PMID: 36900351 PMCID: PMC10000666 DOI: 10.3390/cancers15051560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 02/13/2023] [Accepted: 02/27/2023] [Indexed: 03/06/2023] Open
Abstract
The aim of the article is to provide a summary of the work carried out in the framework of a research project funded by the Italian Ministry of Research. The main goal of the activity was to introduce multiple tools for reliable, affordable, and high-performance microwave hyperthermia for cancer therapy. The proposed methodologies and approaches target microwave diagnostics, accurate in vivo electromagnetic parameters estimation, and improvement in treatment planning using a single device. This article provides an overview of the proposed and tested techniques and shows their complementarity and interconnection. To highlight the approach, we also present a novel combination of specific absorption rate optimization via convex programming with a temperature-based refinement method implemented to mitigate the effect of thermal boundary conditions on the final temperature map. To this purpose, numerical tests were carried out for both simple and anatomically detailed 3D scenarios for the head and neck region. These preliminary results show the potential of the combined technique and improvements in the temperature coverage of the tumor target with respect to the case wherein no refinement is adopted.
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Affiliation(s)
- Martina T. Bevacqua
- Department of Information Engineering, Infrastructures and Sustainable Energy, Università Mediterranea di Reggio Calabria, Via Graziella, 89124 Reggio di Calabria, Italy
- Consorzio Nazionale Interuniversitario per le Telecomunicazioni (CNIT), Consorzio Nazionale Interuniversitario per le Telecomunicazioni, Viale G.P. Usberti, 181/A Pal.3, 43124 Parma, Italy
| | - Rossella Gaffoglio
- Advanced Computing, Photonics & Electromagnetics (CPE), Fondazione LINKS, 10138 Turin, Italy
| | - Gennaro G. Bellizzi
- Department of Information Engineering, Infrastructures and Sustainable Energy, Università Mediterranea di Reggio Calabria, Via Graziella, 89124 Reggio di Calabria, Italy
- Correspondence: (G.G.B.); (T.I.)
| | - Marco Righero
- Advanced Computing, Photonics & Electromagnetics (CPE), Fondazione LINKS, 10138 Turin, Italy
| | - Giorgio Giordanengo
- Advanced Computing, Photonics & Electromagnetics (CPE), Fondazione LINKS, 10138 Turin, Italy
| | - Lorenzo Crocco
- National Research Council of Italy (CNR), Istituto per il Rilevamento Elettromagnetico dell’ Ambiente, CNR-IREA, Via Diocleziano 308, 80100 Napoli, Italy
| | - Giuseppe Vecchi
- Department of Electronics and Telecommunications, Politecnico di Torino, 10129 Turin, Italy
| | - Tommaso Isernia
- Department of Information Engineering, Infrastructures and Sustainable Energy, Università Mediterranea di Reggio Calabria, Via Graziella, 89124 Reggio di Calabria, Italy
- Consorzio Nazionale Interuniversitario per le Telecomunicazioni (CNIT), Consorzio Nazionale Interuniversitario per le Telecomunicazioni, Viale G.P. Usberti, 181/A Pal.3, 43124 Parma, Italy
- National Research Council of Italy (CNR), Istituto per il Rilevamento Elettromagnetico dell’ Ambiente, CNR-IREA, Via Diocleziano 308, 80100 Napoli, Italy
- Correspondence: (G.G.B.); (T.I.)
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Drizdal T, Paulides MM, Sumser K, Vrba D, Malena L, Vrba J, Fiser O, van Rhoon GC. Application of photogrammetry reconstruction for hyperthermia quality control measurements. Phys Med 2022; 101:87-94. [PMID: 35987024 DOI: 10.1016/j.ejmp.2022.08.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 08/04/2022] [Indexed: 11/29/2022] Open
Abstract
PURPOSE Hyperthermia is a cancer treatment in which the target region is heated to temperatures of 40-44 °C usually applying external electromagnetic field sources. The behavior of the hyperthermia applicators (antennas) in clinical practice should be periodically checked with phantom experiments to verify the applicator's performance over time. The purpose of this study was to investigate the application of photogrammetry reconstructions of 3D applicator position in these quality control procedure measurements. METHODS Photogrammetry reconstruction was applied at superficial hyperthermia scenario using the Lucite cone applicator (LCA) and phased-array heating in the head and neck region using the HYPERcollar3D. Wire-frame models of the entire measurement setups were created from multiple-view images and used for recreation of the setup inside 3D electromagnetic field simulation software. We evaluated applicator relation (Ra) between measured and simulated absolute specific absorption rate (SAR) for manually created and photogrammetry reconstructed simulation setups. RESULTS We found a displacement of 7.9 mm for the LCA and 8.2 mm for the HYPERcollar3D setups when comparing manually created and photogrammetry reconstructed applicator models placements. Ra improved from 1.24 to 1.18 for the LCA and from 1.17 to 1.07 for the HYPERcollar3D when using photogrammetry reconstructed simulation setups. CONCLUSION Photogrammetry reconstruction technique holds promise to improve measurement setup reconstruction and agreement between measured and simulated absolute SAR.
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Affiliation(s)
- Tomas Drizdal
- Dept. of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 272 01 Kladno, Czech Republic; Hyperthermia Unit, Dept. of Radiation Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, 3015 GD Rotterdam, the Netherlands.
| | - Margarethus M Paulides
- Hyperthermia Unit, Dept. of Radiation Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, 3015 GD Rotterdam, the Netherlands; Dept. of Electrical Engineering, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, the Netherlands
| | - Kemal Sumser
- Hyperthermia Unit, Dept. of Radiation Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, 3015 GD Rotterdam, the Netherlands
| | - David Vrba
- Dept. of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 272 01 Kladno, Czech Republic
| | - Lukas Malena
- Dept. of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 272 01 Kladno, Czech Republic
| | - Jan Vrba
- Dept. of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 272 01 Kladno, Czech Republic
| | - Ondrej Fiser
- Dept. of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 272 01 Kladno, Czech Republic
| | - Gerard C van Rhoon
- Hyperthermia Unit, Dept. of Radiation Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein 40, 3015 GD Rotterdam, the Netherlands
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Drizdal T, van Rhoon GC, Verhaart RF, Fiser O, Paulides MM. A Guide for Water Bolus Temperature Selection for Semi-Deep Head and Neck Hyperthermia Treatments Using the HYPERcollar3D Applicator. Cancers (Basel) 2021; 13:cancers13236126. [PMID: 34885235 PMCID: PMC8657004 DOI: 10.3390/cancers13236126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 11/17/2021] [Indexed: 11/16/2022] Open
Abstract
During hyperthermia cancer treatments, especially in semi-deep hyperthermia in the head and neck (H&N) region, the induced temperature pattern is the result of a complex interplay between energy delivery and tissue cooling. The purpose of this study was to establish a water bolus temperature guide for the HYPERcollar3D H&N applicator. First, we measured the HYPERcollar3D water bolus heat-transfer coefficient. Then, for 20 H&N patients and phase/amplitude settings of 93 treatments we predict the T50 for nine heat-transfer coefficients and ten water bolus temperatures ranging from 20-42.5 °C. Total power was always tuned to obtain a maximum of 44 °C in healthy tissue in all simulations. As a sensitivity study we used constant and temperature-dependent tissue cooling properties. We measured a mean heat-transfer coefficient of h = 292 W m-2K-1 for the HYPERcollar3D water bolus. The predicted T50 shows that temperature coverage is more sensitive to the water bolus temperature than to the heat-transfer coefficient. We propose changing the water bolus temperature from 30 °C to 35 °C which leads to a predicted T50 increase of +0.17/+0.55 °C (constant/temperature-dependent) for targets with a median depth < 20 mm from the skin surface. For deeper targets, maintaining a water bolus temperature at 30 °C is proposed.
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Affiliation(s)
- Tomas Drizdal
- Hyperthermia Unit, Department of Radiation Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein, 3015 GD Rotterdam, The Netherlands; (G.C.v.R.); (R.F.V.); (M.M.P.)
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 272 01 Kladno, Czech Republic;
- Correspondence:
| | - Gerard C. van Rhoon
- Hyperthermia Unit, Department of Radiation Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein, 3015 GD Rotterdam, The Netherlands; (G.C.v.R.); (R.F.V.); (M.M.P.)
| | - Rene F. Verhaart
- Hyperthermia Unit, Department of Radiation Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein, 3015 GD Rotterdam, The Netherlands; (G.C.v.R.); (R.F.V.); (M.M.P.)
| | - Ondrej Fiser
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 272 01 Kladno, Czech Republic;
| | - Margarethus M. Paulides
- Hyperthermia Unit, Department of Radiation Oncology, Erasmus MC Cancer Institute, Dr. Molewaterplein, 3015 GD Rotterdam, The Netherlands; (G.C.v.R.); (R.F.V.); (M.M.P.)
- Department of Electrical Engineering, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands
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Sumser K, Drizdal T, Bellizzi GG, Hernandez-Tamames JA, van Rhoon GC, Paulides MM. Experimental Validation of the MRcollar: An MR Compatible Applicator for Deep Heating in the Head and Neck Region. Cancers (Basel) 2021; 13:5617. [PMID: 34830773 PMCID: PMC8615935 DOI: 10.3390/cancers13225617] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/29/2021] [Accepted: 11/08/2021] [Indexed: 12/13/2022] Open
Abstract
Clinical effectiveness of hyperthermia treatments, in which tumor tissue is artificially heated to 40-44 °C for 60-90 min, can be hampered by a lack of accurate temperature monitoring. The need for noninvasive temperature monitoring in the head and neck region (H&N) and the potential of MR thermometry prompt us to design an MR compatible hyperthermia applicator: the MRcollar. In this work, we validate the design, numerical model, and MR performance of the MRcollar. The MRcollar antennas have low reflection coefficients (<-15 dB) and the intended low interaction between the individual antenna modules (<-32 dB). A 10 °C increase in 3 min was reached in a muscle-equivalent phantom, such that the specifications from the European Society for Hyperthermic Oncology were easily reached. The MRcollar had a minimal effect on MR image quality and a five-fold improvement in SNR was achieved using the integrated coils of the MRcollar, compared to the body coil. The feasibility of using the MRcollar in an MR environment was shown by a synchronous heating experiment. The match between the predicted SAR and measured SAR using MR thermometry satisfied the gamma criteria [distance-to-agreement = 5 mm, dose-difference = 7%]. All experiments combined show that the MRcollar delivers on the needs for MR-hyperthermia in the H&N and is ready for in vivo investigation.
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Affiliation(s)
- Kemal Sumser
- Department of Radiotherapy, Erasmus Medical Center Cancer Institute, 3015 GD Rotterdam, The Netherlands; (T.D.); (G.G.B.); (G.C.v.R.); (M.M.P.)
| | - Tomas Drizdal
- Department of Radiotherapy, Erasmus Medical Center Cancer Institute, 3015 GD Rotterdam, The Netherlands; (T.D.); (G.G.B.); (G.C.v.R.); (M.M.P.)
- Department of Biomedical Technology, Czech Technical University in Prague, nam. Sítna 3105, 272 01 Kladno, Czech Republic
| | - Gennaro G. Bellizzi
- Department of Radiotherapy, Erasmus Medical Center Cancer Institute, 3015 GD Rotterdam, The Netherlands; (T.D.); (G.G.B.); (G.C.v.R.); (M.M.P.)
| | - Juan A. Hernandez-Tamames
- Department of Radiology and Nuclear Medicine, Erasmus Medical Center Cancer Institute, 3015 GD Rotterdam, The Netherlands;
| | - Gerard C. van Rhoon
- Department of Radiotherapy, Erasmus Medical Center Cancer Institute, 3015 GD Rotterdam, The Netherlands; (T.D.); (G.G.B.); (G.C.v.R.); (M.M.P.)
| | - Margarethus Marius Paulides
- Department of Radiotherapy, Erasmus Medical Center Cancer Institute, 3015 GD Rotterdam, The Netherlands; (T.D.); (G.G.B.); (G.C.v.R.); (M.M.P.)
- Department of Electrical Engineering, Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
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Paulides MM, Rodrigues DB, Bellizzi GG, Sumser K, Curto S, Neufeld E, Montanaro H, Kok HP, Dobsicek Trefna H. ESHO benchmarks for computational modeling and optimization in hyperthermia therapy. Int J Hyperthermia 2021; 38:1425-1442. [PMID: 34581246 DOI: 10.1080/02656736.2021.1979254] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND The success of cancer hyperthermia (HT) treatments is strongly dependent on the temperatures achieved in the tumor and healthy tissues as it correlates with treatment efficacy and safety, respectively. Hyperthermia treatment planning (HTP) simulations have become pivotal for treatment optimization due to the possibility for pretreatment planning, optimization and decision making, as well as real-time treatment guidance. MATERIALS AND METHODS The same computational methods deployed in HTP are also used for in silico studies. These are of great relevance for the development of new HT devices and treatment approaches. To aid this work, 3 D patient models have been recently developed and made available for the HT community. Unfortunately, there is no consensus regarding tissue properties, simulation settings, and benchmark applicators, which significantly influence the clinical relevance of computational outcomes. RESULTS AND DISCUSSION Herein, we propose a comprehensive set of applicator benchmarks, efficacy and safety optimization algorithms, simulation settings and clinical parameters, to establish benchmarks for method comparison and code verification, to provide guidance, and in view of the 2021 ESHO Grand Challenge (Details on the ESHO grand challenge on HTP will be provided at https://www.esho.info/). CONCLUSION We aim to establish guidelines to promote standardization within the hyperthermia community such that novel approaches can quickly prove their benefit as quickly as possible in clinically relevant simulation scenarios. This paper is primarily focused on radiofrequency and microwave hyperthermia but, since 3 D simulation studies on heating with ultrasound are now a reality, guidance as well as a benchmark for ultrasound-based hyperthermia are also included.
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Affiliation(s)
- Margarethus M Paulides
- Electromagnetics for Care & Cure Laboratory (EM4C&C), Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.,Department of Radiotherapy, Erasmus University Medical Center Cancer Institute, Rotterdam, The Netherlands
| | - Dario B Rodrigues
- Hyperthermia Therapy Program, Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, USA
| | - Gennaro G Bellizzi
- Department of Radiotherapy, Erasmus University Medical Center Cancer Institute, Rotterdam, The Netherlands
| | - Kemal Sumser
- Department of Radiotherapy, Erasmus University Medical Center Cancer Institute, Rotterdam, The Netherlands
| | - Sergio Curto
- Department of Radiotherapy, Erasmus University Medical Center Cancer Institute, Rotterdam, The Netherlands
| | - Esra Neufeld
- Foundation for Research on Information Technologies in Society (IT'IS), Zurich, Switzerland
| | - Hazael Montanaro
- Foundation for Research on Information Technologies in Society (IT'IS), Zurich, Switzerland.,Laboratory for Acoustics/Noise control, Swiss Federal Laboratories for Materials Science and Technology (EMPA), Dubendorf, Switzerland
| | - H Petra Kok
- Department of Radiation Oncology, Amsterdam University Medical Centers, University of Amsterdam, Cancer Center Amsterdam, Amsterdam, The Netherlands
| | - Hana Dobsicek Trefna
- Biomedical Electromagnetics Group, Department of Electrical Engineering, Chalmers University of Technology, Göteborg, Sweden
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Drizdal T, Sumser K, Bellizzi GG, Fiser O, Vrba J, Rhoon GCV, Yeo DTB, Margarethus M Paulides. Simulation guided design of the MRcollar: a MR compatible applicator for deep heating in the head and neck region. Int J Hyperthermia 2021; 38:382-392. [PMID: 33682594 DOI: 10.1080/02656736.2021.1892836] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
PURPOSE To develop a head and neck hyperthermia phased array system compatible with a 1.5 T magnetic resonance (MR) scanner for noninvasive thermometry. METHODS We designed a dielectric-parabolic-reflector antenna (DiPRA) based on a printed reflector backed dipole antenna and studied its predicted and measured performance in a flat configuration (30 mm thick water bolus and muscle equivalent layer). Thereafter, we designed a phased array applicator model ('MRcollar') consisting of 12 DiPRA modules placed on a radius of 180 mm. Theoretical heating performance of the MRcollar model was benchmarked against the current clinical applicator (HYPERcollar3D) using specific (3D) head and neck models of 28 treated patients. Lastly, we assessed the influence of the DiPRA modules on MR scanning quality. RESULTS The predicted and measured reflection coefficients (S11) of the DiPRA module are below -20 dB. The maximum specific absorption rate (SAR) in the area under the antenna was 47% higher than for the antenna without encasing. Compared to the HYPERcollar3D, the MRcollar design incorporates 31% less demineralized water (-2.5 L), improves the predicted TC25 (target volume enclosed by 25% iso-SAR contour) by 4.1% and TC50 by 8.5%, while the target-to-hotspot quotient (THQ) is minimally affected (-1.6%). MR experiments showed that the DiPRA modules do not affect MR transmit/receive performance. CONCLUSION Our results suggest that head and neck hyperthermia delivery quality with the MRcollar can be maintained, while facilitating simultaneous noninvasive MR thermometry for treatment monitoring and control.
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Affiliation(s)
- Tomas Drizdal
- Hyperthermia Unit, Department of Radiotherapy, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.,Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, Kladno, Czech Republic, Kladno, Czech Republic in Prague
| | - Kemal Sumser
- Hyperthermia Unit, Department of Radiotherapy, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Gennaro G Bellizzi
- Hyperthermia Unit, Department of Radiotherapy, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.,Department of Information Engineering, Infrastructures and Sustainable Energy, Universita Mediterranea di Reggio Calabria, Reggio di Calabria, Italy
| | - Ondrej Fiser
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, Kladno, Czech Republic, Kladno, Czech Republic in Prague
| | - Jan Vrba
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, Kladno, Czech Republic, Kladno, Czech Republic in Prague
| | - Gerard C van Rhoon
- Hyperthermia Unit, Department of Radiotherapy, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Desmond T B Yeo
- Imaging and Bioelectronic Technologies, GE Global Research Centre, Niskayuna, NY, USA
| | - Margarethus M Paulides
- Hyperthermia Unit, Department of Radiotherapy, Erasmus MC Cancer Institute, Rotterdam, The Netherlands.,Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
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Eigentler TW, Winter L, Han H, Oberacker E, Kuehne A, Waiczies H, Schmitter S, Boehmert L, Prinz C, Trefna HD, Niendorf T. Wideband Self-Grounded Bow-Tie Antenna for Thermal MR. NMR IN BIOMEDICINE 2020; 33:e4274. [PMID: 32078208 DOI: 10.1002/nbm.4274] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 01/07/2020] [Accepted: 01/27/2020] [Indexed: 06/10/2023]
Abstract
The objective of this study was the design, implementation, evaluation and application of a compact wideband self-grounded bow-tie (SGBT) radiofrequency (RF) antenna building block that supports anatomical proton (1 H) MRI, fluorine (19 F) MRI, MR thermometry and broadband thermal intervention integrated in a whole-body 7.0 T system. Design considerations and optimizations were conducted with numerical electromagnetic field (EMF) simulations to facilitate a broadband thermal intervention frequency of the RF antenna building block. RF transmission (B1+ ) field efficiency and specific absorption rate (SAR) were obtained in a phantom, and the thigh of human voxel models (Ella, Duke) for 1 H and 19 F MRI at 7.0 T. B1+ efficiency simulations were validated with actual flip-angle imaging measurements. The feasibility of thermal intervention was examined by temperature simulations (f = 300, 400 and 500 MHz) in a phantom. The RF heating intervention (Pin = 100 W, t = 120 seconds) was validated experimentally using the proton resonance shift method and fiberoptic probes for temperature monitoring. The applicability of the SGBT RF antenna building block for in vivo 1 H and 19 F MRI was demonstrated for the thigh and forearm of a healthy volunteer. The SGBT RF antenna building block facilitated 19 F and 1 H MRI at 7.0 T as well as broadband thermal intervention (234-561 MHz). For the thigh of the human voxel models, a B1+ efficiency ≥11.8 μT/√kW was achieved at a depth of 50 mm. Temperature simulations and heating experiments in a phantom demonstrated a temperature increase ΔT >7 K at a depth of 10 mm. The compact SGBT antenna building block provides technology for the design of integrated high-density RF applicators and for the study of the role of temperature in (patho-) physiological processes by adding a thermal intervention dimension to an MRI device (Thermal MR).
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Affiliation(s)
- Thomas Wilhelm Eigentler
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
- Technische Universität Berlin, Chair of Medical Engineering, Berlin, Germany
| | - Lukas Winter
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
- Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, Berlin, Germany
| | - Haopeng Han
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
- Institute of Computer Science, Humboldt-Universitätzu Berlin, Berlin, Germany
| | - Eva Oberacker
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | | | | | - Sebastian Schmitter
- Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, Berlin, Germany
| | - Laura Boehmert
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health (BIH), Berlin, Germany
| | - Christian Prinz
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health (BIH), Berlin, Germany
| | - Hana Dobsicek Trefna
- Department of Electrical Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Thoralf Niendorf
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
- MRI.TOOLS GmbH, Berlin, Germany
- Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
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9
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Role of Simulations in the Treatment Planning of Radiofrequency Hyperthermia Therapy in Clinics. JOURNAL OF ONCOLOGY 2019; 2019:9685476. [PMID: 31558904 PMCID: PMC6735211 DOI: 10.1155/2019/9685476] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 07/20/2019] [Accepted: 07/28/2019] [Indexed: 12/26/2022]
Abstract
Hyperthermia therapy is a treatment modality in which tumor temperatures are elevated to higher temperatures to cause damage to cancerous tissues. Numerical simulations are integral in the development of hyperthermia treatment systems and in clinical treatment planning. In this study, simulations in radiofrequency hyperthermia therapy are reviewed in terms of their technical development and clinical aspects for effective clinical use. This review offers an overview of mathematical models and the importance of tissue properties; locoregional mild hyperthermia therapy, including phantom and realistic human anatomy models; phase array systems; tissue damage; thermal dose analysis; and thermoradiotherapy planning. This review details the improvements in numerical approaches in treatment planning and their application for effective clinical use. Furthermore, the modeling of thermoradiotherapy planning, which can be integrated with radiotherapy to provide combined hyperthermia and radiotherapy treatment planning strategies, are also discussed. This review may contribute to the effective development of thermoradiotherapy planning in clinics.
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10
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Schooneveldt G, Dobšíček Trefná H, Persson M, de Reijke TM, Blomgren K, Kok HP, Crezee H. Hyperthermia Treatment Planning Including Convective Flow in Cerebrospinal Fluid for Brain Tumour Hyperthermia Treatment Using a Novel Dedicated Paediatric Brain Applicator. Cancers (Basel) 2019; 11:E1183. [PMID: 31443246 PMCID: PMC6721488 DOI: 10.3390/cancers11081183] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 07/29/2019] [Accepted: 08/13/2019] [Indexed: 12/29/2022] Open
Abstract
Hyperthermia therapy (40-44 °C) is a promising option to increase efficacy of radiotherapy/chemotherapy for brain tumours, in particular paediatric brain tumours. The Chalmers Hyperthermia Helmet is developed for this purpose. Hyperthermia treatment planning is required for treatment optimisation, but current planning systems do not involve a physically correct model of cerebrospinal fluid (CSF). This study investigates the necessity of fluid modelling for treatment planning. We made treatments plans using the Helmet for both pre-operative and post-operative cases, comparing temperature distributions predicted with three CSF models: a convective "fluid" model, a non-convective "solid" CSF model, and CSF models with increased effective thermal conductivity ("high-k"). Treatment plans were evaluated by T90, T50 and T10 target temperatures and treatment-limiting hot spots. Adequate heating is possible with the helmet. In the pre-operative case, treatment plan quality was comparable for all three models. In the post-operative case, the high-k models were more accurate than the solid model. Predictions to within ±1 °C were obtained by a 10-20-fold increased effective thermal conductivity. Accurate modelling of the temperature in CSF requires fluid dynamics, but modelling CSF as a solid with enhanced effective thermal conductivity might be a practical alternative for a convective fluid model for many applications.
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Affiliation(s)
- Gerben Schooneveldt
- Department of Radiotherapy, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands.
| | - Hana Dobšíček Trefná
- Department of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - Mikael Persson
- Department of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - Theo M de Reijke
- Department of Urology, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
| | - Klas Blomgren
- Department of Women's and Children's Health, Karolinska Institutet, 17164 Stockholm, Sweden
- Department of Pediatric Oncology, Karolinska University Hospital, 17164 Stockholm, Sweden
| | - H Petra Kok
- Department of Radiotherapy, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
| | - Hans Crezee
- Department of Radiotherapy, Amsterdam UMC, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
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11
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Abstract
The feasibility of using hydrogels as a water bolus during hyperthermia treatment was assessed. Three types of gels, high methoxyl (HM) pectin/alginate, xanthan/locust bean gum (LBG) and xanthan/LBG/agarose were evaluated based on their dielectric, rheological and mechanical properties. The most suitable, xanthan/LBG/agarose gel was further used as a water bolus in a hyperthermia array applicator. The gels composed of polysaccharides carrying low charge displayed dielectric properties close to those of water, while the dielectric properties of HM pectin/alginate gel was deemed unsuitable for the current application. The mechanical examination shows that the xanthan/LBG gel has a non-brittle behaviour at room temperature, in contrast to the agarose gel. The moduli of the xanthan/LBG gel weaken however considerably between the temperature range of 40 °C and 50 °C, reducing its potential to be used as water bolus. The ternary system of xanthan/LBG/agarose had advantageous behaviour as it was dominated by the thermal hysteresis typical of agarose upon temperature increase, but governed by the typical non-brittle behaviour of the xanthan/LBG at low temperatures. The final evaluation within the hyperthermia applicator showed excellent signal transmission from the antennas. The agarose/xanthan/LBG gel reduced the scattering of electromagnetic waves, enabled a tight closure between the body and the antennas, and offered a less bulky solution than the currently used water-filled plastic bags. The results presented here open up a new application area for hydrogels in improving heat delivery during hyperthermia treatment and other near-field microwave applications.
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Affiliation(s)
- Hana Dobšíček Trefná
- Department of Electrical Engineering, Chalmers University of Technology, Göteborg, Sweden
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12
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Bellizzi GG, Drizdal T, van Rhoon GC, Crocco L, Isernia T, Paulides MM. Predictive value of SAR based quality indicators for head and neck hyperthermia treatment quality. Int J Hyperthermia 2019; 36:456-465. [PMID: 30973030 DOI: 10.1080/02656736.2019.1590652] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
PURPOSE Hyperthermia treatment quality determines treatment effectiveness as shown by the clinically derived thermal-dose effect relations. SAR based optimization factors are used as possible surrogate for temperature, since they are not affected by thermal tissue properties uncertainty and variations. Previously, target coverage (TC) at the 25% and 50% iso-SAR level was shown predictive for treatment outcome in superficial hyperthermia and the target-to-hot-spot-quotient (THQ) was shown to highly correlate with predictive temperature in deep pelvic hyperthermia. Here, we investigate the correlation with temperature for THQ and TC using an 'intermediate' scenario: semi-deep hyperthermia in the head & neck region using the HYPERcollar3D. METHODS Fifteen patient-specific models and two different planning approaches were used, including random perturbations to circumvent optimization bias. The predicted SAR indicators were compared to predicted target temperature distribution indicators T50 and T90, i.e., the median and 90th percentile temperature respectively. RESULTS The intra-patient analysis identified THQ, TC25 and TC50 as good temperature surrogates: with a mean correlation coefficient R2T50 = 0.72 and R2T90=0.66. The inter-patient analysis identified the highest correlation with TC25 (R2T50 = 0.76, R2T90=0.54) and TC50 (R2T50 = 0.74, R2T90 = 0.56). CONCLUSION Our investigation confirmed the validity of our current strategy for deep hyperthermia in the head & neck based on a combination of THQ and TC25. TC50 was identified as the best surrogate since it enables optimization and patient inclusion decision making using one single parameter.
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Affiliation(s)
- Gennaro G Bellizzi
- a DIIES , Università Mediterranea di Reggio Calabria , Reggio di Calabria , Italy.,b Department of Radiation Oncology, Erasmus Medical Center , Hyperthermia Unit , Rotterdam , The Netherlands.,c Institute for Electromagnetic Sensing of the Environment National Research Council of Italy , Napoli , Italy
| | - Tomas Drizdal
- b Department of Radiation Oncology, Erasmus Medical Center , Hyperthermia Unit , Rotterdam , The Netherlands.,d Department of Biomedical Technology , Czech Technical University in Prague , Prague , Czech Republic
| | - Gerard C van Rhoon
- b Department of Radiation Oncology, Erasmus Medical Center , Hyperthermia Unit , Rotterdam , The Netherlands
| | - Lorenzo Crocco
- c Institute for Electromagnetic Sensing of the Environment National Research Council of Italy , Napoli , Italy
| | - Tommaso Isernia
- a DIIES , Università Mediterranea di Reggio Calabria , Reggio di Calabria , Italy.,c Institute for Electromagnetic Sensing of the Environment National Research Council of Italy , Napoli , Italy
| | - Margarethus M Paulides
- b Department of Radiation Oncology, Erasmus Medical Center , Hyperthermia Unit , Rotterdam , The Netherlands.,e Department of Electrical Engineering , Eindhoven University of Technology , Eindhoven , The Netherlands
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13
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Bevacqua MT, Bellizzi GG, Isernia T, Crocco L. A METHOD FOR EFFECTIVE PERMITTIVITY AND CONDUCTIVITY MAPPING OF BIOLOGICAL SCENARIOS VIA SEGMENTED CONTRAST SOURCE INVERSION. ACTA ACUST UNITED AC 2019. [DOI: 10.2528/pier18071704] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Bellizzi GG, Drizdal T, van Rhoon GC, Crocco L, Isernia T, Paulides MM. The potential of constrained SAR focusing for hyperthermia treatment planning: analysis for the head & neck region. Phys Med Biol 2018; 64:015013. [PMID: 30523869 DOI: 10.1088/1361-6560/aaf0c4] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Clinical trials have shown that hyperthermia is a potent adjuvant to conventional cancer treatments, but the temperatures currently achieved in the clinic are still suboptimal. Hyperthermia treatment planning simulations have potential to improve the heating profile of phased-array applicators. An important open challenge is the development of an effective optimization procedure that enables uniform heating of the target region while keeping temperature below a threshold in healthy tissues. In this work, we analyzed the effectiveness and efficiency of a recently proposed optimization approach, i.e. focusing via constrained power optimization (FOCO), using 3D simulations of twelve clinical patient specific models. FOCO performance was compared against a clinically used particle swarm based optimization approach. Evaluation metrics were target coverage at the 25% iso-SAR level, target hotspot quotient, median target temperature (T50) and computational requirements. Our results show that, on average, constrained power focusing performs slightly better than the clinical benchmark ([Formula: see text]T50 [Formula: see text] °C), but outperforms this clinical benchmark for large target volumes ([Formula: see text]40 cm[Formula: see text], [Formula: see text]T50 [Formula: see text] °C). In addition, the results are achieved in a shorter time ([Formula: see text]%) and are repeatable because the approach is formulated as a convex optimization problem.
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Affiliation(s)
- G G Bellizzi
- Universitá Mediterranea di Reggio Calabria, DIIES, Reggio di Calabria, Italy. Erasmus Medical Center, Radiation Oncology Department, Hyperthermia Unit, Rotterdam, The Netherlands. IREA-CNR, Institute for Electromagnetic Sensing of the Environment, National Research Council of Italy, Napoli, Italy. Author to whom any correspondence should be addressed
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15
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Cappiello G, Drizdal T, Mc Ginley B, O’Halloran M, Glavin M, van Rhoon GC, Jones E, Paulides MM. The potential of time-multiplexed steering in phased array microwave hyperthermia for head and neck cancer treatment. ACTA ACUST UNITED AC 2018; 63:135023. [DOI: 10.1088/1361-6560/aaca10] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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16
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Gao S, Zheng M, Ren X, Tang Y, Liang X. Local hyperthermia in head and neck cancer: mechanism, application and advance. Oncotarget 2018; 7:57367-57378. [PMID: 27384678 PMCID: PMC5302995 DOI: 10.18632/oncotarget.10350] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2015] [Accepted: 06/16/2016] [Indexed: 02/05/2023] Open
Abstract
Local hyperthermia (HT), particularly in conjunction with surgery, radiotherapy and chemotherapy was useful for the treatment of human malignant tumors including head and neck cancer. However, at present it suffered from many limitations such as thermal dose control, target treatment regions and discrimination between healthy and cancer cells. Recent developments in nanotechnology have introduced novel and smart therapeutic nanomaterials to local HT of head and neck cancer that basically take advantage of various targeting approaches. The aim of this paper is to give a brief review of the mechanism, methods and clinical applications of local HT in head and neck cancer, mainly focusing on photothermal therapy (PTT) and nanoparticle-based hyperthermia.
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Affiliation(s)
- Shiyu Gao
- State Key Laboratory of Oral Diseases West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Min Zheng
- Department of Stomatology, Zhoushan Hospital, Zhoushan, China
| | - Xiaohua Ren
- Department of Stomatology, Sichuan Medical Science Academy and Sichuan Provincial People's Hospital, Chengdu, China
| | - Yaling Tang
- State Key Laboratory of Oral Diseases West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xinhua Liang
- State Key Laboratory of Oral Diseases West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Oral and Maxillofacial Surgery West China Hospital of Stomatology, Sichuan University, Chengdu, China
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17
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Drizdal T, Paulides MM, van Holthe N, van Rhoon GC. Hyperthermia treatment planning guided applicator selection for sub-superficial head and neck tumors heating. Int J Hyperthermia 2017; 34:704-713. [DOI: 10.1080/02656736.2017.1383517] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Affiliation(s)
- Tomas Drizdal
- Department of Radiation Oncology, Hyperthermia Unit, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Margarethus M. Paulides
- Department of Radiation Oncology, Hyperthermia Unit, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Netteke van Holthe
- Department of Radiation Oncology, Hyperthermia Unit, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
| | - Gerard C. van Rhoon
- Department of Radiation Oncology, Hyperthermia Unit, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
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18
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Tudorancea I, Porumb V, Trandabăţ A, Neaga D, Tamba B, Iliescu R, Dimofte GM. New experimental model for single liver lobe hyperthermia in small animals using non-directional microwaves. PLoS One 2017; 12:e0184810. [PMID: 28934251 PMCID: PMC5608293 DOI: 10.1371/journal.pone.0184810] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 08/31/2017] [Indexed: 11/19/2022] Open
Abstract
PURPOSE Our aim was to develop a new experimental model for in vivo hyperthermia using non-directional microwaves, applicable to small experimental animals. We present an affordable approach for targeted microwave heat delivery to an isolated liver lobe in rat, which allows rapid, precise and stable tissue temperature control. MATERIALS AND METHODS A new experimental model is proposed. We used a commercial available magnetron generating 2450 MHz, with 4.4V and 14A in the filament and 4500V anodic voltage. Modifications were required in order to adjust tissue heating such as to prevent overheating and to allow for fine adjustments according to real-time target temperature. The heating is controlled using a virtual instrument application implemented in LabView® and responds to 0.1° C variations in the target. Ten healthy adult male Wistar rats, weighing 250-270 g were used in this study. The middle liver lobe was the target for controlled heating, while the rest of the living animal was protected. RESULTS In vivo microwave delivery using our experimental setting is safe for the animals. Target tissue temperature rises from 30°C to 40°C with 3.375°C / second (R2 = 0.9551), while the increment is lower it the next two intervals (40-42°C and 42-44°C) with 0.291°C/ s (R2 = 0.9337) and 0.136°C/ s (R2 = 0.7894) respectively, when testing in sequences. After reaching the desired temperature, controlled microwave delivery insures a very stable temperature during the experiments. CONCLUSIONS We have developed an inexpensive and easy to manufacture system for targeted hyperthermia using non-directional microwave radiation. This system allows for fine and stable temperature adjustments within the target tissue and is ideal for experimental models testing below or above threshold hyperthermia.
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Affiliation(s)
- Ionuț Tudorancea
- Department of Physiology, Grigore T. Popa University of Medicine and Pharmacy, Iasi, Romania
| | - Vlad Porumb
- Department of Surgery, Grigore T. Popa University of Medicine and Pharmacy, Iasi, Romania
- Department of Surgery, Regional Institute of Oncology, Iasi, Romania
- * E-mail:
| | - Alexandru Trandabăţ
- Faculty of Electrical Engineering, Gheorghe Asachi Technical University, Iaşi, Romania
| | - Decebal Neaga
- Department of Engineering, Regional Institute of Oncology, Iasi, Romania
| | - Bogdan Tamba
- Department of Pharmacology, Grigore T. Popa University of Medicine and Pharmacy, Iasi, Romania
| | - Radu Iliescu
- Department of Pharmacology, Grigore T. Popa University of Medicine and Pharmacy, Iasi, Romania
| | - Gabriel M. Dimofte
- Department of Surgery, Grigore T. Popa University of Medicine and Pharmacy, Iasi, Romania
- Department of Surgery, Regional Institute of Oncology, Iasi, Romania
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19
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Cappiello G, McGinley B, Elahi MA, Drizdal T, Paulides MM, Glavin M, O'Halloran M, Jones E. Differential Evolution Optimization of the SAR Distribution for Head and Neck Hyperthermia. IEEE Trans Biomed Eng 2017; 64:1875-1885. [DOI: 10.1109/tbme.2016.2627941] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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Paulides MM, Mestrom RMC, Salim G, Adela BB, Numan WCM, Drizdal T, Yeo DTB, Smolders AB. A printed Yagi-Uda antenna for application in magnetic resonance thermometry guided microwave hyperthermia applicators. Phys Med Biol 2017; 62:1831-1847. [PMID: 28052042 DOI: 10.1088/1361-6560/aa56b3] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Biological studies and clinical trials show that addition of hyperthermia stimulates conventional cancer treatment modalities and significantly improves treatment outcome. This supra-additive stimulation can be optimized by adaptive hyperthermia to counteract strong and dynamic thermoregulation. The only clinically proven method for the 3D non-invasive temperature monitoring required is by magnetic resonance (MR) temperature imaging, but the currently available set of MR compatible hyperthermia applicators lack the degree of heat control required. In this work, we present the design and validation of a high-frequency (433 MHz ISM band) printed circuit board antenna with a very low MR-footprint. This design is ideally suited for use in a range of hyperthermia applicator configurations. Experiments emulating the clinical situation show excellent matching properties of the antenna over a 7.2% bandwidth (S 11 < -15 dB). Its strongly directional radiation properties minimize inter-element coupling for typical array configurations (S 21 < -23 dB). MR imaging distortion by the antenna was found negligible and MR temperature imaging in a homogeneous muscle phantom was highly correlated with gold-standard probe measurements (root mean square error: RMSE = 0.51 °C and R 2 = 0.99). This work paves the way for tailored MR imaging guided hyperthermia devices ranging from single antenna or incoherent antenna-arrays, to real-time adaptive hyperthermia with phased-arrays.
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Affiliation(s)
- M M Paulides
- Department of Radiation Oncology, Erasmus University Medical Center, Cancer Institute, Rotterdam, Netherlands
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21
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Paulides MM, Verduijn GM, Van Holthe N. Status quo and directions in deep head and neck hyperthermia. Radiat Oncol 2016; 11:21. [PMID: 26868027 PMCID: PMC4751675 DOI: 10.1186/s13014-016-0588-8] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 01/13/2016] [Indexed: 12/18/2022] Open
Abstract
The benefit of hyperthermia as a potent modifier of radiotherapy has been well established and more recently also the combination with chemotherapy was shown beneficial. Also for head and neck cancer, the impact of hyperthermia has been clinically demonstrated by a number of clinical trials. Unfortunately, the technology applied in these studies provided only limited thermal dose control, and the devices used only allowed treatment of target regions close to the skin. Over the last decade, we developed the technology for deep and controlled hyperthermia that allows treatment of the entire head and neck region. Our strategy involves focused microwave heating combined with 3D patient-specific electromagnetic and thermal simulations for conformal, reproducible and adaptive hyperthermia application. Validation of our strategy has been performed by 3D thermal dose assessment based on invasively placed temperature sensors combined with the 3D patient specific simulations. In this paper, we review the phase III clinical evidence for hyperthermia in head and neck tumors, as well as the heating and dosimetry technology applied in these studies. Next, we describe the development, clinical implementation and validation of 3D guided deep hyperthermia with the HYPERcollar, and its second generation, i.e. the HYPERcollar3D. Lastly, we discuss early clinical results and provide an outlook for this technology.
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Affiliation(s)
| | - Gerda M Verduijn
- Erasmus MC Cancer Institute, Box 5201, 3008AE, Rotterdam, The Netherlands.
| | - Netteke Van Holthe
- Erasmus MC Cancer Institute, Box 5201, 3008AE, Rotterdam, The Netherlands.
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