TY  - CHAP
A1  - Bitz, Andreas
A1  - Kraff, O.
A1  - Orzada, S.
A1  - Maderwald, S.
A1  - Brote, I.
A1  - Johst, S.
A1  - Ladd, E.
T1  - Assessment of RF Safety of Transmit Coils at 7 Tesla by Experimental and Numerical Procedures (490.)
T2  - 19th annual ISMRM scientific meeting and exhibition 2011 : Montreal, Quebec, Canada, 7 - 13 May 2011
Y1  - 2012
SN  - 978-1-61839-284-8
IS  - Volume 1
SP  - 475
PB  - Curran
CY  - Red Hook, NY
ER  - 
TY  - JOUR
A1  - Schlamann, M.
A1  - Yoon, M.-S.
A1  - Maderwald, S.
A1  - Pietrzyk, T.
A1  - Bitz, Andreas
A1  - Gerwig, M.
A1  - Forsting, M.
A1  - Ladd, S. C.
A1  - Ladd, M. E.
A1  - Kastrup, O.
T1  - Auswirkungen der Magnetresonanztomografie auf die Elektrophysiologie des motorischen Kortex: eine Studie mit transkranieller Magnetstimulation
T1  - Effects of MRI on the electrophysiology of the motor cortex: a TMS study
JF  - RöFo - Fortschritte auf dem Giebiet der Röntgenstrahlen und der bildgebenden Verfahren
Y1  - 2009
U6  - http://dx.doi.org/10.1055/s-0028-1109038
SN  - 1438-9029
VL  - 181
IS  - 3
SP  - 215
EP  - 219
PB  - Thieme
CY  - Stuttgart
ER  - 
TY  - CHAP
A1  - Bitz, Andreas
A1  - Kraff, O.
A1  - Orzada, S.
A1  - Maderwald, S.
A1  - Brote, I.
A1  - Ladd, M.
T1  - Experimental and Numerical Assessment of RF Safety of Transmit Coils at 7 Tesla
T2  - ISMRM workshop on MR safety 2010 : RF heating of the human in MRI : workshop series. The Washington County Historic Courthouse, Stillwater, Minnesota, USA, 15 - 17 October 2010
Y1  - 2010
SN  - 978-1-62276-088-6
SP  - 195
ER  - 
TY  - JOUR
A1  - Umutlu, L.
A1  - Maderwald, S.
A1  - Kinner, S.
A1  - Kraff, O.
A1  - Bitz, Andreas
A1  - Orzada, S.
A1  - Johst, S.
A1  - Wrede, K.
A1  - Forsting, M.
A1  - Ladd, M. E.
A1  - Lauenstein, T. C.
A1  - Quick, H. H.
T1  - First-pass contrast-enhanced renal MRA at 7 Tesla: initial results
JF  - European Radiology
Y1  - 2013
U6  - http://dx.doi.org/10.1007/s00330-012-2666-0
SN  - 1432-1084
VL  - 23
IS  - 4
SP  - 1059
EP  - 1066
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Orzada, S.
A1  - Maderwald, S.
A1  - Poser, B. A.
A1  - Johst, S.
A1  - Kannengiesser, S.
A1  - Ladd, M. E.
A1  - Bitz, Andreas
T1  - Time-interleaved acquisition of modes: an analysis of SAR and image contrast implications
JF  - Magnetic Resonance in Medicine
N2  - s the magnetic field strength and therefore the operational frequency in MRI are increased, the radiofrequency wavelength approaches the size of the human head/body, resulting in wave effects which cause signal decreases and dropouts. Especially, whole-body imaging at 7 T and higher is therefore challenging. Recently, an acquisition scheme called time-interleaved acquisition of modes has been proposed to tackle the inhomogeneity problems in high-field MRI. The basic premise is to excite two (or more) different Burn:x-wiley:07403194:media:MRM23081:tex2gif-stack-1 modes using static radiofrequency shimming in an interleaved acquisition, where the complementary radiofrequency patterns of the two modes can be exploited to improve overall signal homogeneity. In this work, the impact of time-interleaved acquisition of mode on image contrast as well as on time-averaged specific absorption rate is addressed in detail. Time-interleaved acquisition of mode is superior in Burn:x-wiley:07403194:media:MRM23081:tex2gif-stack-2 homogeneity compared with conventional radiofrequency shimming while being highly specific absorption rate efficient. Time-interleaved acquisition of modes can enable almost homogeneous high-field imaging throughout the entire field of view in PD, T2, and T2*-weighted imaging and, if a specified homogeneity criterion is met, in T1-weighted imaging as well.
Y1  - 2012
U6  - http://dx.doi.org/10.1002/mrm.23081
SN  - 1522-2594
VL  - 67
IS  - 4
SP  - 1033
EP  - 1041
PB  - Wiley-Liss
CY  - New York
ER  -