Výsledky vyhledávání - "Alexander J.E. Raaijmakers"

A self-matched leaky-wave antenna for ultrahigh-field magnetic resonance imaging with low specific absorption rate

Autor: Alexander J.E. Raaijmakers, Stanislav Glybovski, Andreas Rennings, C. van Leeuwen, Jan Taro Svejda, Georgiy Solomakha, Daniel Erni

Publikováno v: Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021)
Nature Communications

The technology of magnetic resonance imaging is developing towards higher magnetic fields to improve resolution and contrast. However, whole-body imaging at 7 T or even higher flux densities remains challenging due to wave interference, tissue inhomo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af3fc451996ea3ae0f68623e2cfa5ed1
https://doaj.org/article/f8848815566d49bfb9685b50ed505f59

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Explaining RF induced current patterns on implantable medical devices during MRI using the transfer matrix

Autor: Janot P. Tokaya, Alexander J.E. Raaijmakers, Peter R. Luijten, Cornelis A. T. van den Berg

Publikováno v: Medical Physics

Purpose In this work a simulation study is performed to gain insights in the patterns of induced radiofrequency (RF) currents for various implant-like structures at 1.5 T. The previously introduced transfer matrix (TM) is used to determine why certai

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2457644eedb0c827d4b2150788ff9973
https://doi.org/10.1002/mp.14225

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7T MR Safety

Autor: Christopher M. Collins, Andrew J. Fagan, Vera Kimbrell, Isabella M. Björkman-Burtscher, Alexander J.E. Raaijmakers, Andreas K. Bitz

Publikováno v: J Magn Reson Imaging

Magnetic resonance imaging and spectroscopy (MRI/MRS) at 7T represents an exciting advance in MR technology, with intriguing possibilities to enhance image spatial, spectral, and contrast resolution. To ensure the safe use of this technology while st

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc32dc61d0d5f0d8018c82b1a3ea37ba
https://doi.org/10.1002/jmri.27319

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Conditional safety margins for less conservative peak local SAR assessment: A probabilistic approach

Autor: Bart R. Steensma, Alexander J.E. Raaijmakers, Peter R. Luijten, Ettore F. Meliadò, Cornelis A. T. van den Berg, Alessandro Sbrizzi

Publikováno v: Magnetic Resonance in Medicine

PURPOSE The introduction of a linear safety factor to address peak local specific absorption rate (pSAR10g ) uncertainties (eg, intersubject variation, modeling inaccuracies) bears one considerable drawback: It often results in over-conservative scan

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::86adf0e03700e9d476ed75f5cb5eb2f1
http://europepmc.org/articles/PMC7540599

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Fast contour propagation for MR‐guided prostate radiotherapy using convolutional neural networks

Autor: Matteo Maspero, J. de Boer, Alexander J.E. Raaijmakers, Koen A. J. Eppenhof, J.R.N. Van der Voort van Zyp, Josien P. W. Pluim, Mitko Veta, Bas W. Raaymakers, C.A.T. Van den Berg, Mark H. F. Savenije

Publikováno v: Medical Physics, 47(3), 1238-1248. AAPM-American Association of Physicists in Medicine
Medical Physics

Purpose: To quickly and automatically propagate organ contours from pretreatment to fraction images in magnetic resonance (MR)-guided prostate external-beam radiotherapy. Methods: Five prostate cancer patients underwent 20 fractions of image-guided e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e612193af21bc0ed929370c2afd3e001
https://research.tue.nl/en/publications/7e679a96-f786-4fe6-abf6-0e1205d80ba4

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Potential Reduction of Peripheral Local SAR for a Birdcage Body Coil at 3 Tesla Using a Magnetic Shield

Autor: D.W.J. Klomp, C.C. van Leeuwen, Constantin Simovski, Bart R. Steensma, Stanislav Glybovski, Alexander J.E. Raaijmakers, C.A.T. Van den Berg, M.F.J. Lunenburg

Publikováno v: Frontiers in Physics, Vol 9 (2021)

The birdcage body coil, the standard transmit coil in clinical MRI systems, is typically a shielded coil. The shield avoids interaction with other system components, but Eddy Currents induced in the shield have an opposite direction with respect to t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0642bf1cbae1e7d0643208774043417b
https://doi.org/10.3389/fphy.2021.716521

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The (un)expected benefits of coaxial antennas for MRI

Autor: Carel C. van Leeuwen, Cornelis A. T. van den Berg, Bart R. Steensma, Alexander J.E. Raaijmakers, Stefan E Zijlema

Publikováno v: 2021 International Conference on Electromagnetics in Advanced Applications (ICEAA).

Shielded-coaxial-cable loops, or high impedance coils (HICs), are receiving increased interest in the MRI community because of performance benefits such as better decoupling, lower peak SAR in transmit mode and a flexible coil design. In this work, w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::47ad7f5e8a7e00227f36a23b72336646
https://doi.org/10.1109/iceaa52647.2021.9539681

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Visualization of Metasurface Eigenmodes with Magnetic Resonance Imaging

Autor: Andrew G. Webb, Irina V. Melchakova, A. V. Kozachenko, Cornelis A. T. van den Berg, Alena V. Shchelokova, Alexander J.E. Raaijmakers, Pavel A. Belov, Alexey P. Slobozhanyuk

Publikováno v: Physical Review Applied. 16

Standard techniques to image the eigenmodes of a metasurface are based on collecting signals from various spatial positions via a probe on a motorized platform---typically a slow procedure, and only a two-dimensional near-field profile can be measure

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4af474894e6b5bb314b06cb2e2a28283
https://doi.org/10.1103/physrevapplied.16.l021002

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The Coax Dipole: A fully flexible coaxial cable dipole antenna with flattened current distribution for body imaging at 7 Tesla

Autor: Bart R. Steensma, Carel C. van Leeuwen, Alexander J.E. Raaijmakers, Dennis W. J. Klomp, Cornelis A. T. van den Berg

Publikováno v: Magnetic resonance in medicine. 87(1)

Purpose The coax dipole antenna, a flexible antenna for body imaging at 7T is presented. Similar to the high impedance coil, this coaxial cable antenna is fed on the central conductor and through gaps in the shield, the current passes to the outside

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1752aed8a9f75e668664de57e8c8f09
https://pubmed.ncbi.nlm.nih.gov/34411327

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MRI‐based transfer function determination through the transfer matrix by jointly fitting the incident and scattered field

Autor: Cornelis A. T. van den Berg, Peter R. Luijten, Alexander J.E. Raaijmakers, Alessandro Sbrizzi, Janot P. Tokaya

Publikováno v: Magnetic Resonance in Medicine. 83:1081-1095

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a101a068b00ae00452dbb961f3a6c6c
https://doi.org/10.1002/mrm.27974

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