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Two 27 MHz Simple Inductive Loops, as Hyperthermia Treatment Applicators: Theoretical Analysis and Development.

Kouloulias V, Karanasiou I, Koutsoupidou M, Matsopoulos G, Kouvaris J, Uzunoglu N - Comput Math Methods Med (2015)

Bottom Line: The specific absorption rate (SAR) distributions were estimated from the respective local phantom temperature measurements.Comparisons of the theoretical, simulation, and experimental studies showed satisfying agreement.The penetration depth was measured theoretically and experimentally in the range of 2-3.5 cm.

View Article: PubMed Central - PubMed

Affiliation: 2nd Department of Radiology, ATTIKON University Hospital, Medical School, University of Athens, Rimini 1, Haidari, 124 64 Athens, Greece ; Microwave and Fiber Optics Laboratory, School of Electrical and Computer Engineering, Institute of Communication and Computer Systems, National Technical University of Athens, Heroon Polytechniou 9, 15780 Zografou, Greece ; 1st Department of Radiology, Aretaieion University Hospital, Medical School, University of Athens, Vassilissis Sofias 76, 115 28 Athens, Greece.

ABSTRACT

Background: Deep heating is still the main subject for research in hyperthermia treatment.

Aim: The purpose of this study was to develop and analyze a simple loop as a heating applicator.

Methods: The performance of two 27 MHz inductive loop antennas as potential applicators in hyperthermia treatment was studied theoretically as well as experimentally in phantoms. Two inductive loop antennas with radii 7 cm and 9 cm were designed, simulated, and constructed. The theoretical analysis was performed by using Green's function and Bessel's function technique. Experiments were performed with phantoms radiated by the aforementioned loop antennas.

Results: The specific absorption rate (SAR) distributions were estimated from the respective local phantom temperature measurements. Comparisons of the theoretical, simulation, and experimental studies showed satisfying agreement. The penetration depth was measured theoretically and experimentally in the range of 2-3.5 cm.

Conclusion: The theoretical and experimental analysis showed that current loops are efficient in the case where the peripheral heating of spherical tumor formation located at 2-3.5 cm depth is required.

No MeSH data available.


Related in: MedlinePlus

SAR distribution for depths of 0, 2, and 4 cm, for radiation times 1, 2, 3, 4, and 5 min when the antenna radius is 7 cm.
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fig11: SAR distribution for depths of 0, 2, and 4 cm, for radiation times 1, 2, 3, 4, and 5 min when the antenna radius is 7 cm.

Mentions: The two antennas used for the radiation had radii of 7 and 9 cm, respectively, and they were placed at 1 cm distance over the phantom material. The results are depicted in Figures 11-12 for radiation times 1, 2, 3, 4, and 5 min, depths 0, 2, and 4 cm, and distances from the center of the circular loop 0–10 cm with a step of 1 cm. In Figure 10 the SAR distribution in relation to the penetration depth in the phantom is depicted.


Two 27 MHz Simple Inductive Loops, as Hyperthermia Treatment Applicators: Theoretical Analysis and Development.

Kouloulias V, Karanasiou I, Koutsoupidou M, Matsopoulos G, Kouvaris J, Uzunoglu N - Comput Math Methods Med (2015)

SAR distribution for depths of 0, 2, and 4 cm, for radiation times 1, 2, 3, 4, and 5 min when the antenna radius is 7 cm.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663302&req=5

fig11: SAR distribution for depths of 0, 2, and 4 cm, for radiation times 1, 2, 3, 4, and 5 min when the antenna radius is 7 cm.
Mentions: The two antennas used for the radiation had radii of 7 and 9 cm, respectively, and they were placed at 1 cm distance over the phantom material. The results are depicted in Figures 11-12 for radiation times 1, 2, 3, 4, and 5 min, depths 0, 2, and 4 cm, and distances from the center of the circular loop 0–10 cm with a step of 1 cm. In Figure 10 the SAR distribution in relation to the penetration depth in the phantom is depicted.

Bottom Line: The specific absorption rate (SAR) distributions were estimated from the respective local phantom temperature measurements.Comparisons of the theoretical, simulation, and experimental studies showed satisfying agreement.The penetration depth was measured theoretically and experimentally in the range of 2-3.5 cm.

View Article: PubMed Central - PubMed

Affiliation: 2nd Department of Radiology, ATTIKON University Hospital, Medical School, University of Athens, Rimini 1, Haidari, 124 64 Athens, Greece ; Microwave and Fiber Optics Laboratory, School of Electrical and Computer Engineering, Institute of Communication and Computer Systems, National Technical University of Athens, Heroon Polytechniou 9, 15780 Zografou, Greece ; 1st Department of Radiology, Aretaieion University Hospital, Medical School, University of Athens, Vassilissis Sofias 76, 115 28 Athens, Greece.

ABSTRACT

Background: Deep heating is still the main subject for research in hyperthermia treatment.

Aim: The purpose of this study was to develop and analyze a simple loop as a heating applicator.

Methods: The performance of two 27 MHz inductive loop antennas as potential applicators in hyperthermia treatment was studied theoretically as well as experimentally in phantoms. Two inductive loop antennas with radii 7 cm and 9 cm were designed, simulated, and constructed. The theoretical analysis was performed by using Green's function and Bessel's function technique. Experiments were performed with phantoms radiated by the aforementioned loop antennas.

Results: The specific absorption rate (SAR) distributions were estimated from the respective local phantom temperature measurements. Comparisons of the theoretical, simulation, and experimental studies showed satisfying agreement. The penetration depth was measured theoretically and experimentally in the range of 2-3.5 cm.

Conclusion: The theoretical and experimental analysis showed that current loops are efficient in the case where the peripheral heating of spherical tumor formation located at 2-3.5 cm depth is required.

No MeSH data available.


Related in: MedlinePlus