16‐channel bow tie antenna transceiver array for cardiac MR at 7.0 tesla

Oezerdem, Celal; Winter, Lukas; Graessl, Andreas; Paul, Katharina; Els, Antje; Weinberger, Oliver; Rieger, Jan; Kuehne, André; Dieringer, Matthias A.; Hezel, Fabian; Voit, Dirk; Frahm, Jens; Niendorf, Thoralf

doi:10.1002/mrm.25840

Cited by 77 publications

(106 citation statements)

References 43 publications

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“…This justifies the use of birdcage type RF coils for transmission and loop RF coils for reception at lower fields (B0≤3.0T), while dipole antennas are well suited as transmit/receive elements for UHF MRI at B0≥7.0T (31,(119)(120)(121) and above (122). The usage of dipole or "dipole-like" antennas as a targeted RF heating device is very well recognized by the hyperthermia community (104,(126)(127)(128).…”

Section: Integrated Systems or Thermal Mrmentioning

confidence: 99%

Magnetic resonance thermometry: Methodology, pitfalls and practical solutions

Winter

Oberacker

Paul

et al. 2015

International Journal of Hyperthermia

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175

163

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Clinically established thermal therapies like thermo ablative approaches or adjuvant hyperthermia treatment rely on accurate thermal dose information for the evaluation and adaptation of the thermal therapy. Intratumoral temperature measurements have been correlated successfully with clinical endpoints. Magnetic resonance imaging is the most suitable technique for non-invasive thermometry avoiding complications related to invasive temperature measurements. Since the advent of MR thermometry two decades ago, numerous MR thermometry techniques have been developed continuously increasing accuracy and robustness for in vivo applications. While this progress was primarily focused on relative temperature mapping, current and future efforts will likely close the gap towards quantitative temperature readings. These efforts are essential to benchmark thermal therapy efficiency, understand temperature related biophysical and physiological processes and to use these insights to set new landmarks for diagnostic and therapeutic applications. With that in mind, this review summarizes and discusses advances in MR thermometry providing practical considerations, pitfalls and technical obstacles constraining temperature measurement accuracy, spatial and temporal resolution in vivo. Established approaches and current trends in thermal therapy hardware are surveyed with respect to potential benefits for MR thermometry.3

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Section: Integrated Systems or Thermal Mrmentioning

confidence: 99%

Magnetic resonance thermometry: Methodology, pitfalls and practical solutions

Winter

Oberacker

Paul

et al. 2015

International Journal of Hyperthermia

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175

163

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“…To address this obstacle multi-element transceiver coil arrays have been developed. These developments took advantage of building blocks that include stripline elements (34)(35)(36)(37)(38), dielectric resonant antennae (39), loop elements (40)(41)(42)(43)(44)(45)(46) and electrical dipoles (47)(48)(49)(50)(51)(52)(53).…”

Section: Theorymentioning

confidence: 99%

Electrodynamics and radiofrequency antenna concepts for human magnetic resonance at 23.5 T (1 GHz) and beyond

Winter

Niendorf

2016

Magn Reson Mater Phy

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Materials and MethodsElectromagnetic field simulations (EMF) are performed in phantoms with average tissue simulants for dipole antennae using discrete frequencies (300MHz (7.0T) to 3GHz (70.0T)).To advance to a human setup EMF simulations are conducted in anatomical human voxel models of the human head using a 20-element dipole array operating at 1 GHz. ResultsOur results demonstrate that transmission fields suitable for 1 H MR of the human brain can be achieved at 1GHz. An increase in transmit channel density around the human head helps to enhance B1 + in the center of the brain. The calculated relative increase in specific absorption rate (SAR) at 23.5T vs. 7.0T was below 1.4 (in-phase phase setting) and 2.7 (circular polarized phase setting) for the dipole antennae array. ConclusionThe benefits of multi-channel dipole antennae at higher frequencies render MR at 23.5Tfeasible from an electrodynamic standpoint. This very preliminary finding opens the door on further explorations that might be catalyzed into a 20 Tesla class human MR system.2

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“…Local transceiver (TX/RX) and multi-channel transmission arrays in conjunction with multi-channel local receive arrays have been suggested as possible solutions. Eminent developments put building blocks to use consisting of stripline elements [41][42][43][44][45], electrical dipoles [45][46][47][48][49][50][51], dielectric resonant antennas [52], slot antennas [53], and loop elements [54][55][56][57][58][59]. Rigid, flexible and modular configurations have been exploited.…”

Section: Challenges and Technical Solutions For Cardiac Mri At Ultrahmentioning

confidence: 99%

Myocardial T2* Mapping with Ultrahigh Field Magnetic Resonance: Physics and Frontier Applications

Huelnhagen

Paul

et al. 2017

Front. Phys.

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Cardiovascular magnetic resonance imaging (CMR) has become an indispensable clinical tool for the assessment of morphology, function and structure of the heart muscle. By exploiting quantification of the effective transverse relaxation time (T 2 * ) CMR also affords myocardial tissue characterization and probing of cardiac physiology, both being in the focus of ongoing research. These developments are fueled by the move to ultrahigh magnetic field strengths, which permits enhanced sensitivity and spatial resolution that help to overcome limitations of current clinical MR systems with the goal to contribute to a better understanding of myocardial (patho)physiology in vivo. In this context, the aim of this report is to introduce myocardial T 2 * mapping at ultrahigh magnetic fields as a promising technique to non-invasively assess myocardial (patho)physiology. For this purpose the basic principles of T 2 * assessment, the biophysical mechanisms determining T 2 * and (pre)clinical applications of myocardial T 2 * mapping are presented.Technological challenges and solutions for T 2 * sensitized CMR at ultrahigh magnetic field strengths are discussed followed by a review of acquisition techniques and post-processing approaches. Preliminary results derived from myocardial T 2 * mapping in healthy subjects and cardiac patients at 7.0 T are presented. A concluding section discusses remaining questions and challenges and provides an outlook on future developments and potential clinical applications.

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16‐channel bow tie antenna transceiver array for cardiac MR at 7.0 tesla

Cited by 77 publications

References 43 publications

Magnetic resonance thermometry: Methodology, pitfalls and practical solutions

Magnetic resonance thermometry: Methodology, pitfalls and practical solutions

Electrodynamics and radiofrequency antenna concepts for human magnetic resonance at 23.5 T (1 GHz) and beyond

Myocardial T2* Mapping with Ultrahigh Field Magnetic Resonance: Physics and Frontier Applications

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