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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Winter, Lukas Niendorf, Thoralf |
| Description | Country affiliation: Germany Author Affiliation: Winter L ( Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück Center for Molecular Medicine, Robert-Roessle-Strasse 10, 13125, Berlin, Germany.); Niendorf T ( Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück Center for Molecular Medicine, Robert-Roessle-Strasse 10, 13125, Berlin, Germany. thoralf.niendorf@mdc-berlin.de.) |
| Abstract | OBJECTIVE: This work investigates electrodynamic constraints, explores RF antenna concepts and examines the transmission fields (B 1 (+) ) and RF power deposition of dipole antenna arrays for (1)H magnetic resonance of the human brain at 1 GHz (23.5 T). MATERIALS AND METHODS: Electromagnetic field (EMF) simulations are performed in phantoms with average tissue simulants for dipole antennae using discrete frequencies [300 MHz (7.0 T) to 3 GHz (70.0 T)]. 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. RESULTS: Our results demonstrate that transmission fields suitable for (1)H MR of the human brain can be achieved at 1 GHz. An increase in transmit channel density around the human head helps to enhance B 1 (+) in the center of the brain. The calculated relative increase in specific absorption rate at 23.5 versus 7.0 T was below 1.4 (in-phase phase setting) and 2.7 (circular polarized phase setting) for the dipole antennae array. CONCLUSION: The benefits of multi-channel dipole antennae at higher frequencies render MR at 23.5 T feasible from an electrodynamic standpoint. This very preliminary finding opens the door on further explorations that might be catalyzed into a 20-T class human MR system. |
| File Format | HTM / HTML |
| ISSN | 09685243 |
| Issue Number | 3 |
| Journal | Magnetic Resonance Materials in Physics, Biology and Medicine |
| Volume Number | 29 |
| e-ISSN | 13528661 |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2016-06-01 |
| Publisher Place | Germany |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Diagnostic Imaging |
| Content Type | Text |
| Resource Type | Article |
| Subject | Radiology, Nuclear Medicine and Imaging Biophysics Radiological and Ultrasound Technology |
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