TY  - GEN
A1  - Frauenrath, Tobias
A1  - Dieringer, Matthias
A1  - Patel, Nishant
A1  - Zerdem, Celal
A1  - Hentschel, Jan
A1  - Renz, Wolfgang
A1  - Niendorf, Thoralf
T1  - From Artifact to Merit: Cardiac Gated MRI at 7T & 3T using Magneto-Hydrodynamic Effects for Synchronization
T2  - 2011 ISMRM Annual Meeting Proceedings
N2  - ECG is corrupted by magneto-hydrodynamic effects at higher magnetic field strength. Artifacts in the ECG trace and severe T-wave elevation might be mis-interpreted as R-waves. MHD being inherently sensitive to blood flow and blood velocity provides an alternative approach for cardiac gating, even in peripheral target areas far away from the commonly used upper torso positions of ECG electrodes. This feature would be very beneficial to address traveling time induced motion artifacts and trigger latency related issues raised by ECG-gated peripheral MR angiography. For all those reasons, this work proposes the use of MHD-trigger for cardiac gated MR.
Y1  - 2011
SN  - 1545-4428
N1  - ISMRM 19th Annual Meeting & Exhibition, 7-13 May 2011, Montreal, Quebec, Canada
ER  - 
TY  - GEN
A1  - Frauenrath, Tobias
A1  - de Geyer d'Orth, Thibaut
A1  - Niendorf, Thoralf
T1  - Assessment of Accuracy & Reproducibility of ECG, Pulse Oximetry & Phonocardiogram Gating of Cardiac MRI at 7T
T2  - 2011 ISMRM Annual Meeting Proceedings
N2  - At (ultra)high magnetic fields the artifact sensitivity of ECG recordings increases. This bears the risk of R-wave mis-registration which has been consistently reported for ECG triggered CMR at 7.0T. Realizing the constraints of conventional ECG, acoustic cardiac triggering (ACT) has been proposed. The clinical ACT has not been carefully examined yet. For this reason, this work scrutinizes the suitability, accuracy and reproducibility of ACT for CMR at 7.0T. For this purpose, the trigger reliability and trigger detection variance are examined together with an qualitative and quantitative assessment of image quality of the heart at 7.0T.
Y1  - 2011
SN  - 1545-4428
N1  - ISMRM 19th Annual Meeting & Exhibition, 7-13 May 2011, Montreal, Quebec, Canada
ER  - 
TY  - GEN
A1  - Martin, Conrad Steven
A1  - Frauenrath, Tobias
A1  - Zerdem, Celal
A1  - Renz, Wolfgang
A1  - Niendorf, Thoralf
T1  - Evaluation of Magneto Alert Sensor (MALSE) to Improve MR Safety by Decreasing the Incidence of Ferromagnetic Projectile Accidents
T2  - 2011 ISMRM Annual Meeting Proceedings
N2  - The magnetic forces of fringe magnetic fields of MR systems on ferromagnetic components can impose a severe patient, occupational health and safety hazard. MRI accidents are listed as number 9 of the top 10 risks in modern medicine. With the advent of ultrahigh field MR systems including passively shielded magnet versions, this risk, commonly known as the missile or projectile effect is even more pronounced. A strategy employing magnetic field sensors which can be attached to ferromagnetic objects that are commonly used in a clinical environment is conceptually appealing for the pursuit of reducing the risk of ferromagnetic projectile accidents.
Y1  - 2011
SN  - 1545-4428
N1  - ISMRM 19th Annual Meeting & Exhibition, 7-13 May 2011, Montreal, Quebec, Canada
ER  -