Compressed sensing based nearfield electromagnetic imaging

BioMed Research International

2017

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This paper proposes a hybrid hyperthermia treatment system, utilizing two noninvasive modalities for treating brain tumors. The proposed system depends on focusing electromagnetic (EM) and ultrasound (US) energies. The EM hyperthermia subsystem enhances energy localization by incorporating a multichannel wideband setting and coherent-phased-array technique. A genetic algorithm based optimization tool is developed to enhance the specific absorption rate (SAR) distribution by reducing hotspots and maximizing energy deposition at tumor regions. The treatment performance is also enhanced by augmenting an ultrasonic subsystem to allow focused energy deposition into deep tumors. The therapeutic faculty of ultrasonic energy is assessed by examining the control of mechanical alignment of transducer array elements. A time reversal (TR) approach is then investigated to address challenges in energy focus in both subsystems. Simulation results of the synergetic effect of both modalities assuming a simplified model of human head phantom demonstrate the feasibility of the proposed hybrid technique as a noninvasive tool for thermal treatment of brain tumors.

Section: The Proposed Hybrid Hyperthermia Treatment Systemmentioning

confidence: 99%

Enhanced Energy Localization in Hyperthermia Treatment Based on Hybrid Electromagnetic and Ultrasonic System: Proof of Concept with Numerical Simulations

Nizam-Uddin

BioMed Research International

2017

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“…Where

ɛ^{'} = ɛ_{normalR}

corresponds to the relative permittivity and

ɛ ″ = \frac{normalσ}{normalω ɛ_{0}}

represents the conductivity of the tissue, respectively. Frequency dependent dielectric properties for various head tissues are derived from . In this research, the relative permittivity of water at is taken to be 78 and dielectric properties of other head including tumor, brain and skull are chosen as shown in Figure A,B.…”

Section: Introductionmentioning

confidence: 99%

“…Frequency dependent dielectric properties for various head tissues are derived from. [25][26][27][28] In this research, the relative permittivity of water at is taken to be 78 and dielectric properties of other head including tumor, brain and skull are chosen as shown in Figure 2A,B.…”

Section: Introductionmentioning

confidence: 99%

Efficient energy localization for hybrid wideband hyperthermia treatment system

Nizam-Uddin

Int J RF Microw Comput Aided Eng

2018

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This article presents efficient energy localization approach for hybrid wideband system for hyperthermia treatment of cancer based on a transmission line (TL). A heterogeneous head phantom is built by incorporating frequency dependent tissue properties of head layers considering both electromagnetic and ultrasound treatment. Effective medium properties are derived and used to compensate signal phase and magnitude values based on TL model. The obtained field map results emphasize the feasibility of the developed approach to obtain system parameters that enhance energy localization and eradicate hotspots.

“…The research work proposed herein aims at enhancing the biomedical head imaging using efficient processing techniques in combination with compressed sensing (CS) based sparse recovery [5,6]. The main objectives of the proposed EM based head imaging are:…”

Section: Introductionmentioning

confidence: 99%

Efficient techniques to enhance nearfield imaging of human head for anomaly detection

Tabassum

2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings

Alam

2015

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This paper proposes efficient algorithms to enhance the nearfield electromagnetic imaging of human head. Forward problem is modeled using SAM head phantom with brain tumor anomalies, surrounded by a circular applicator antenna array. Scattered signals are compressively sensed (CS) at a limited number of sensing positions, and the sensed signals are preprocessed efficiently using a proposed novel technique to maximize information extraction. A dictionary is formed and then implemented in CS based inverse problem analysis. Reconstructed images are enhanced using new post-processing techniques to improve the spatial resolution. Image quality is analyzed using the quality metric in terms of peak signal-to-noise ratio (PSNR). The quality of the reconstructed images and the corresponding PSNR values reveals the validity of the imaging techniques.Index Terms-Nearfield imaging, electromagnetic imaging, head imaging, compressed sensing, SAM phantom.This full text paper was peer-reviewed at the direction of IEEE Instrumentation and Measurement Society prior to the acceptance and publication.978-1-4799-6477-2/15/$31.00 ©2015 IEEE