Helmet Radio Frequency Phased Array Applicators Enhance Thermal Magnetic Resonance of Brain Tumors.

PAPER pubmed Bioengineering (Basel, Switzerland) 2024 Engineering / measurement Effect: benefit Evidence: Low

Read original paper → DOI: 10.3390/bioengineering11070733 PMID: 39061815 Evidence Lab

Abstract

Thermal Magnetic Resonance (ThermalMR) integrates Magnetic Resonance Imaging (MRI) diagnostics and targeted radio-frequency (RF) heating in a single theranostic device. The requirements for MRI (magnetic field) and targeted RF heating (electric field) govern the design of ThermalMR applicators. We hypothesize that helmet RF applicators (HPA) improve the efficacy of ThermalMR of brain tumors versus an annular phased RF array (APA). An HPA was designed using eight broadband self-grounded bow-tie (SGBT) antennae plus two SGBTs placed on top of the head. An APA of 10 equally spaced SGBTs was used as a reference. Electromagnetic field (EMF) simulations were performed for a test object (phantom) and a human head model. For a clinical scenario, the head model was modified with a tumor volume obtained from a patient with glioblastoma multiforme. To assess performance, we introduced multi-target evaluation (MTE) to ensure whole-brain slice accessibility. We implemented time multiplexed vector field shaping to optimize RF excitation. Our EMF and temperature simulations demonstrate that the HPA improves performance criteria critical to MRI and enhances targeted RF and temperature focusing versus the APA. Our findings are a foundation for the experimental implementation and application of a HPA en route to ThermalMR of brain tumors.

AI evidence extraction

At a glance

Study type

Engineering / measurement

Effect direction

benefit

Population

—

Sample size

—

Exposure

RF medical device (ThermalMR RF phased array applicator)

Evidence strength

Low

Confidence: 74% · Peer-reviewed: yes

Main findings

Electromagnetic field and temperature simulations indicated that a helmet RF applicator (8+2 self-grounded bow-tie antennas) improved MRI-related performance criteria and enhanced targeted RF/temperature focusing compared with a 10-element annular phased RF array reference design.

Outcomes measured

Electromagnetic field distribution (simulated)
Temperature distribution / heating focus (simulated)
MRI-related performance criteria (simulated)
Whole-brain slice accessibility (multi-target evaluation)

Limitations

Simulation-based study (EMF and temperature simulations); experimental/clinical validation not reported in abstract
Frequency, power/SAR, and exposure duration not specified in abstract

Suggested hubs

medical-emf (0.86)
RF phased-array applicators for MRI-integrated targeted heating (ThermalMR) in brain tumor context.

View raw extracted JSON

{
    "study_type": "engineering",
    "exposure": {
        "band": "RF",
        "source": "medical device (ThermalMR RF phased array applicator)",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Electromagnetic field distribution (simulated)",
        "Temperature distribution / heating focus (simulated)",
        "MRI-related performance criteria (simulated)",
        "Whole-brain slice accessibility (multi-target evaluation)"
    ],
    "main_findings": "Electromagnetic field and temperature simulations indicated that a helmet RF applicator (8+2 self-grounded bow-tie antennas) improved MRI-related performance criteria and enhanced targeted RF/temperature focusing compared with a 10-element annular phased RF array reference design.",
    "effect_direction": "benefit",
    "limitations": [
        "Simulation-based study (EMF and temperature simulations); experimental/clinical validation not reported in abstract",
        "Frequency, power/SAR, and exposure duration not specified in abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "Thermal Magnetic Resonance",
        "ThermalMR",
        "MRI",
        "radio-frequency heating",
        "phased array",
        "helmet applicator",
        "annular phased array",
        "self-grounded bow-tie antenna",
        "EMF simulation",
        "temperature simulation",
        "glioblastoma multiforme",
        "brain tumor"
    ],
    "suggested_hubs": [
        {
            "slug": "medical-emf",
            "weight": 0.85999999999999998667732370449812151491641998291015625,
            "reason": "RF phased-array applicators for MRI-integrated targeted heating (ThermalMR) in brain tumor context."
        }
    ]
}

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AI-extracted fields are generated from the abstract/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

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