Simulation guided design of the MRcollar: a MR compatible applicator for deep heating in the head and neck region

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F21%3A00347905" target="_blank" >RIV/68407700:21460/21:00347905 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1080/02656736.2021.1892836" target="_blank" >https://doi.org/10.1080/02656736.2021.1892836</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/02656736.2021.1892836" target="_blank" >10.1080/02656736.2021.1892836</a>

Result language

angličtina

Original language name

Simulation guided design of the MRcollar: a MR compatible applicator for deep heating in the head and neck region

Original language description

Purpose: To develop a head and neck hyperthermia phased array system compatible with a 1.5 T magnetic resonance (MR) scanner for noninvasive thermometry. Methods: We designed a dielectric-parabolic-reflector antenna (DiPRA) based on a printed reflector backed dipole antenna and studied its predicted and measured performance in a flat configuration (30 mm thick water bolus and muscle equivalent layer). Thereafter, we designed a phased array applicator model (`MRcollar’) consisting of 12 DiPRA modules placed on a radius of 180 mm. Theoretical heating performance of the MRcollar model was benchmarked against the current clinical applicator (HYPERcollar3D) using specific (3D) head and neck models of 28 treated patients. Lastly, we assessed the influence of the DiPRA modules on MR scanning quality. Results: The predicted and measured reflection coefficients (S11) of the DiPRA module are below -20 dB. The maximum specific absorption rate (SAR) in the area under the antenna was 47% higher than for the antenna without encasing. Compared to the HYPERcollar3D, the MRcollar design incorporates 31% less demineralized water (-2.5 L), improves the predicted TC25 (target volume enclosed by 25% iso-SAR contour) by 4.1% and TC50 by 8.5%, while the target-to-hotspot quotient (THQ) is minimally affected (-1.6%). MR experiments showed that the DiPRA modules do not affect MR transmit/receive performance. Conclusion: Our results suggest that head and neck hyperthermia delivery quality with the MRcollar can be maintained, while facilitating simultaneous noninvasive MR thermometry for treatment monitoring and control.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20201 - Electrical and electronic engineering

Project

<a href="/en/project/LTC19031" target="_blank" >LTC19031: Development of metamaterial applicators for the regional hyperthermia system and evaluation of the accuracy of treatment planning algorithms</a><br>

Continuities

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

Publication year

2021

Confidentiality

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

Name of the periodical

International Journal of Hyperthermia

ISSN

0265-6736

e-ISSN

1464-5157

Volume of the periodical

38

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

382-392

UT code for WoS article

000626285500001

EID of the result in the Scopus database

2-s2.0-85102170584