Extraction of Electrical Properties of Strokes from Magnetic Resonance Scans – Testing on Simplified Head Phantoms

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F17%3A00317051" target="_blank" >RIV/68407700:21460/17:00317051 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Extraction of Electrical Properties of Strokes from Magnetic Resonance Scans – Testing on Simplified Head Phantoms

Popis výsledku v původním jazyce

Several studies have reported considerable differences in dielectric properties between healthy and pathological tissues. In addition, in the area of electromagnetic field applications in medicine, discussions about the correctness of dielectric properties of biological tissues measured ex vivo (the most common method of measurement), for example due to lower blood content, are taking place. By using the inherent electromagnetic working principle of magnetic resonance (MR) systems, changes in wave propagation can be used to extract values of dielectric properties of target tissues from MR images. This method thus represents a method for non-invasive measurement of dielectric properties of biological tissues in Vivo. The results might be used for detection and classification of illness. It has been show in literature that both magnitude and phase of the MR RF waves can be determined using standard MR imaging sequences. By using the resulting magnitude and phase of RF waves dielectric properties can be determined by simply using the Helmholtz equation. In this study we confirm such reports through numerical simulations using high-resolution anatomical head model and a model of bird-cage coil. Furthermore, a simplified head phantom mimicking dielectric properties of strokes and brain tissues was designed and manufactured and information from real MR scans was processed. As it will be shown in this work, this process works well for data obtained via numerical simulations but it is not as straightforward, for the images coming from the MR system. There, additional processing in order to compensate for the presence of noise and de-phasing is crucial.

Název v anglickém jazyce

Extraction of Electrical Properties of Strokes from Magnetic Resonance Scans – Testing on Simplified Head Phantoms

Popis výsledku anglicky

Several studies have reported considerable differences in dielectric properties between healthy and pathological tissues. In addition, in the area of electromagnetic field applications in medicine, discussions about the correctness of dielectric properties of biological tissues measured ex vivo (the most common method of measurement), for example due to lower blood content, are taking place. By using the inherent electromagnetic working principle of magnetic resonance (MR) systems, changes in wave propagation can be used to extract values of dielectric properties of target tissues from MR images. This method thus represents a method for non-invasive measurement of dielectric properties of biological tissues in Vivo. The results might be used for detection and classification of illness. It has been show in literature that both magnitude and phase of the MR RF waves can be determined using standard MR imaging sequences. By using the resulting magnitude and phase of RF waves dielectric properties can be determined by simply using the Helmholtz equation. In this study we confirm such reports through numerical simulations using high-resolution anatomical head model and a model of bird-cage coil. Furthermore, a simplified head phantom mimicking dielectric properties of strokes and brain tissues was designed and manufactured and information from real MR scans was processed. As it will be shown in this work, this process works well for data obtained via numerical simulations but it is not as straightforward, for the images coming from the MR system. There, additional processing in order to compensate for the presence of noise and de-phasing is crucial.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

<a href="/cs/project/GJ17-00477Y" target="_blank" >GJ17-00477Y: Fyzikální podstata interakcí EM pole generovaného MTM strukturami s lidským tělem a studie možnosti jejich perspektivního využití v medicíně</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 39th PIERS in Singapore

ISBN

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ISSN

1559-9450

e-ISSN

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Počet stran výsledku

5

Strana od-do

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Název nakladatele

The Electromagnetics Academy

Místo vydání

Cambridge, MA

Místo konání akce

Singapore

Datum konání akce

19. 11. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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