Non-Contact Monitoring of Temporal Volume Changes of a Hematoma in the Head by a Single Inductive Coil: A Numerical Study

Oziel, Moshe; Korenstein, Rafi; Rubinsky, Boris

doi:10.1109/tbme.2018.2872851

Cited by 23 publications

(19 citation statements)

References 40 publications

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“…The microwave scattering parameters (or S parameters) originate from the transmission line theory and are defined in terms of the transmitted and the reflected voltage waves. A previous study 29 has proven that the scattering parameters can be used for stroke detection, which reflect the changes in the dielectric properties of different cerebral tissues. In the present study, the scattering parameters are transformed using the Euclidean distance transformation to highlight the differences in dielectric properties caused by ischemia and hemorrhage.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 7 b shows a voltage source feeding into the antenna with a source impedance of Z 0 . and are defined as the square root of the forward and the reflected incident microwaves, respectively 29 . The scattering function can be expressed as the vector difference of and : is the magnitude value, and is the phase value of vector .…”

Section: Methodsmentioning

confidence: 99%

“…In addition to the microwave imaging, microwave scattering parameters are used in stroke diagnosis 24 – 31 . These studies focus on computer simulations 24 , 28 , 29 or phantoms 25 – 27 and rarely on in vivo experiments. In 2014, Persson et al have performed a clinical study on 25 patients with acute stroke 31 .…”

Section: Introductionmentioning

confidence: 99%

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Noninvasive and portable stroke type discrimination and progress monitoring based on a multichannel microwave transmitting–receiving system

Yü

Zhang

et al. 2020

Sci Rep

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The hemorrhagic and the ischemic types of stroke have similar symptoms in the early stage, but their treatments are completely different. The timely and effective discrimination of the two types of stroke can considerable improve the patients' prognosis. In this paper, a 16-channel and noncontact microwave-based stroke detection system was proposed and demonstrated for the potential differentiation of the hemorrhagic and the ischemic stroke. In animal experiments, 10 rabbits were divided into two groups. One group consisted of five cerebral hemorrhage models, and the other group consisted of five cerebral ischemia models. The two groups were monitored by the system to obtain the Euclidean distance transform value of microwave scattering parameters caused by pathological changes in the brain. The support vector machine was used to identify the type and the severity of the stroke. Based on the experiment, a discrimination accuracy of 96% between hemorrhage and ischemia stroke was achieved. Furthermore, the potential of monitoring the progress of intracerebral hemorrhage or ischemia was evaluated. The discrimination of different degrees of intracerebral hemorrhage achieved 86.7% accuracy, and the discrimination of different severities of ischemia achieved 94% accuracy. Compared with that with multiple channels, the discrimination accuracy of the stroke severity with a single channel was only 50% for the intracerebral hemorrhage and ischemia stroke. The study showed that the microwave-based stroke detection system can effectively distinguish between the cerebral hemorrhage and the cerebral ischemia models. This system is very promising for the prehospital identification of the stroke type due to its low cost, noninvasiveness, and ease of operation.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Noninvasive and portable stroke type discrimination and progress monitoring based on a multichannel microwave transmitting–receiving system

Yü

Zhang

et al. 2020

Sci Rep

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show abstract

“…Our previous studies of monitoring the brain by a single coil began with mathematical modeling. We used numerical simulations to analyze the performances of a spiral antenna (Oziel et al, 2017) and a single inductive coil surrounding the head (Oziel et al, 2018). These feasibility studies evaluated the sensitivity of the radar-based measurements to small changes in the blood/tissue volume ratio in the case of a brain hemorrhage.…”

Section: Introductionmentioning

confidence: 99%

“…We also found that a device based on a single-coil is superior to the spiral antenna when the bleeding location is unknown. In a further evaluation of the technology, we concluded that the single inductive coil is easier and less expensive to manufacture and use than the spiral antenna configuration (Oziel et al, 2018). Next, we performed an experiment on a cylindrically shaped alcohol-based phantom gel that simulates brain tissue, into which we injected a physiological fluid that simulates blood (Oziel et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "Detection and estimating the blood accumulation volume of brain hemorrhage in a human anatomical skull using a RF single coil (v0.1)"

2020

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Multifrequency Analysis of Single Inductive Coil Measurements Across a Gel Phantom Simulation of Internal Bleeding in the Brain

Oziel

Hjouj

Rubinsky

et al. 2019

Bioelectromagnetics

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The present study is part of an ongoing effort to develop a simple diagnostic technology for detecting internal bleeding in the brain, which can be used in lieu or in support of medical imaging and thereby reduce the cost of diagnostics in general, and in particular, would make diagnostics accessible to economically disadvantaged populations. The study deals with a single coil inductive device to be used for detecting cerebral hemorrhage. It presents a first‐order experimental study that examines the predictions of our recently published theoretical study. The experimental model employs a homogeneous cylindrical phantom in which internal head bleeding was simulated by way of a fluid inclusion. We measured the changes in amplitude and phase across the coil with a network vector analyzer as a function of frequency (100–1,000 MHz), volume of blood simulating fluid, and the site of the fluid injection. We have developed a new mathematical model to statistically analyze the complex data produced in this experiment. We determined that the resolution for the fluid volume increase following fluid injection is strongly dependent on frequency as well as the location of liquid accumulation. The experimental data obtained in this study supports the predictions of our previous theoretical study, and the statistical analysis shows that the simple single coil device is sensitive enough to detect changes due to fluid volume alteration of two milliliters. Bioelectromagnetics. 2020;41:21–33 © 2019 Bioelectromagnetics Society

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Non-Contact Monitoring of Temporal Volume Changes of a Hematoma in the Head by a Single Inductive Coil: A Numerical Study

Cited by 23 publications

References 40 publications

Noninvasive and portable stroke type discrimination and progress monitoring based on a multichannel microwave transmitting–receiving system

Noninvasive and portable stroke type discrimination and progress monitoring based on a multichannel microwave transmitting–receiving system

Peer Review #1 of "Detection and estimating the blood accumulation volume of brain hemorrhage in a human anatomical skull using a RF single coil (v0.1)"

Multifrequency Analysis of Single Inductive Coil Measurements Across a Gel Phantom Simulation of Internal Bleeding in the Brain

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