Towards the Robust and Effective Design of Hyperthermic Devices: Improvement of a Patch Antenna for the Case Study of Abdominal Rhabdomyosarcoma With 3D Perfusion

Lodi, Matteo Bruno; Muntoni, Giacomo; Ruggeri, Alessandro; Fanti, Alessandro; Montisci, Giorgio; Mazzarella, Giuseppe

doi:10.1109/jerm.2020.3016890

Cited by 15 publications

(12 citation statements)

References 66 publications

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“…The most significant thing is that antenna performance, despite everything, satisfies the necessities for WLAN communication. SAR measurements and thermal impacts [48,59] are used to examine the biological effects of the performing antenna. Due to lower permittivity at higher frequencies, there was a decline in biological effect as the resonant frequency increased.…”

Section: Simulation and Measurement Resultsmentioning

confidence: 99%

Solar Cell Integrated Wearable Patch Antenna on Artificial Magnetic Conductor for On-Body and In-Body Communications

Naganathan¹,

Dhandapani²

2022

ACES Journal

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This paper presents a patch antenna on a jeans textile with an artificial magnetic conductor (AMC) structure stacked on a solar cell for wearable applications in the Industrial, Scientific, and Medical (ISM) band. Meanwhile, the loading of the AMC reflector increases the radiation efficiency and antenna gain and also results in a reduction in specific absorption rate levels. As examination cases, two textile antenna designs loaded on 7 × 8 patches of AMC plane with the ground plane of both fully copper conductor and partially copper aided with solar cells were fabricated and tested, presenting a strong agreement between simulation and measurement. Its measured impedance bandwidth is 13.79% (2.16 GHz–2.48 GHz) with good return loss and voltage standing wave ratio features in the operating band where it is being used. Besides being a source of electricity, the silicon solar cells are also used as a radio frequency ground plane for the AMC plane. They can produce363.08 mW.

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Section: Simulation and Measurement Resultsmentioning

confidence: 99%

Solar Cell Integrated Wearable Patch Antenna on Artificial Magnetic Conductor for On-Body and In-Body Communications

Naganathan¹,

Dhandapani²

2022

ACES Journal

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“…The array response was tested in silico by varying the thickness of fat and muscle layers for different curvature radii, considering the bone and skin layers size to be constant. The thickness variation of fat and muscle is known to strongly affect the coupling, field homogeneity, and SAR patterns [56], [57].…”

Section: B Analysis and Preliminary Characterization For Human Mrimentioning

confidence: 99%

Analysis of a Flexible Dual-Channel Octagonal Coil System for UHF MRI

et al. 2022

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Nowadays, MRI is focused on using ultra-high static magnetic fields (> 7 T) to increase the signal-to-noise ratio. The use of high fields, on the other hand, requires novel technical solutions as well as more stringent design criteria for specific absorption rate levels, reducing radiative effect and coil resistance. In this paper, two flexible RF coils for 7 T human magnetic resonance, and 298 MHz ultrahigh frequency operations were analyzed and characterized. Imaging of lower human limbs is regarded as a case study. The lumped element theory and subsequent numerical simulations were used to finetune the single-coil element and the dual-coil array design, respectively. Here, we demonstrate how the shape, size, configuration, and presence of the sample influence the coil performance. The penetration depth of the B 1 -field and the specific absorption rate values have been determined numerically using two numerical surface phantoms: saline and a multilayer human tissue. A preliminary study in the presence of a saline solution phantom has been carried out to develop and validate the dual-coil system. The frequency response of the dual-coil array was measured to assess its robustness when coupled to twelve human volunteers. We found that our design is robust to variations in the anatomical properties of the human thighs, and hence to coil bending. The presented approach can be useful for the implementation of flexible devices with high sensitivity levels and low specific absorption rate.

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“…15,16 These studies employed heating techniques that can be integrated with MRI systems, such as focused ultrasound, mammography, computer tomography (CT) and microwave imaging (MI). 13,[17][18][19][20][21] The microwave spectrum, on which these machines run, induces the electric jEj field and magnetic jBj field to detect the cancerous sites via several classes of antenna, such as dipole, slotted dipole, bow ties and various types of microstrip patch. [18][19][20][21][22] During the diagnosis, trial can observe at more than $43 C on the cancerous organ.…”

Section: Introductionmentioning

confidence: 99%

Microstrip coils for MR‐imaging with induced RF heating for hyperthermia

Narasimman

Karuppanan²

2022

Int J RF Mic Comp-Aid Eng

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A highly compact design of a surface MRI coil antenna that can be used for detecting tumour tissues and recovering the tissues from radio therapy has been presented in this practical study. It is a reconfigured MRI array with minimised dimensions by 78.5% compared to that of a reported MRI coil. The design parameters have been validated effectively. Two resonant modes were provided by the MRI coil, making it the most prominent component. Of these, the MRI coil made use of the uniform magnetic field of the first mode. The second mode, which created a strong and focused electric field jEj, allowed for radio frequency (RF) heating. We have estimated the cumulative specific absorption ratio (SAR) and temperature. It was feasible to construct a 500 MHz field with a uniform magnetic flux density jB1j to simulate an antenna at the Larmor frequency. At 7.2 GHz, the proposed patch antenna with a Simulated Phantom Wrist-hand (SPW) model was fixed on the test-bed. The SPW model used in the biological simulation had cancerous tissues injected into it. A magnetic (jB1j) homogeneity in the tumour tissues with a standard deviation of 44.1% was observed along with a 4.77 C increase in temperature using the proposed test-bed. However, the proposed prototype has to be studied for its diagnostic application and exploring the heat energy essential for hyperthermia therapy.

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Towards the Robust and Effective Design of Hyperthermic Devices: Improvement of a Patch Antenna for the Case Study of Abdominal Rhabdomyosarcoma With 3D Perfusion

Cited by 15 publications

References 66 publications

Solar Cell Integrated Wearable Patch Antenna on Artificial Magnetic Conductor for On-Body and In-Body Communications

Solar Cell Integrated Wearable Patch Antenna on Artificial Magnetic Conductor for On-Body and In-Body Communications

Analysis of a Flexible Dual-Channel Octagonal Coil System for UHF MRI

Microstrip coils for MR‐imaging with induced RF heating for hyperthermia

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