TY  - JOUR
A1  - Chen, Bixia
A1  - Schoemberg, Tobias
A1  - Kraff, Oliver
A1  - Dammann, Philipp
A1  - Bitz, Andreas
A1  - Schlamann, Marc
A1  - Quick, Harald H.
A1  - Ladd, Mark E.
A1  - Sure, Ulrich
A1  - Wrede, Karsten H.
T1  - Cranial fixation plates in cerebral magnetic resonance imaging: a 3 and 7 Tesla in vivo image quality study
JF  - Magnetic Resonance Materials in Physics, Biology and Medicine
N2  - Objective
This study assesses and quantifies impairment of postoperative magnetic resonance imaging (MRI) at 7 Tesla (T) after implantation of titanium cranial fixation plates (CFPs) for neurosurgical bone flap fixation.

Materials and methods
The study group comprised five patients who were intra-individually examined with 3 and 7 T MRI preoperatively and postoperatively (within 72 h/3 months) after implantation of CFPs. Acquired sequences included T₁-weighted magnetization-prepared rapid-acquisition gradient-echo (MPRAGE), T₂-weighted turbo-spin-echo (TSE) imaging, and susceptibility-weighted imaging (SWI). Two experienced neurosurgeons and a neuroradiologist rated image quality and the presence of artifacts in consensus reading.

Results
Minor artifacts occurred around the CFPs in MPRAGE and T2 TSE at both field strengths, with no significant differences between 3 and 7 T. In SWI, artifacts were accentuated in the early postoperative scans at both field strengths due to intracranial air and hemorrhagic remnants. After resorption, the brain tissue directly adjacent to skull bone could still be assessed. Image quality after 3 months was equal to the preoperative examinations at 3 and 7 T.

Conclusion
Image quality after CFP implantation was not significantly impaired in 7 T MRI, and artifacts were comparable to those in 3 T MRI.
Y1  - 2016
U6  - http://dx.doi.org/10.1007/s10334-016-0548-1
SN  - 1352-8661
VL  - 29
IS  - 3
SP  - 389
EP  - 398
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Bitz, Andreas
A1  - Zhou, Yi
A1  - El Quardi, Abdessamad
A1  - Streckert, Joachim
T1  - Occupational Exposure at Mobile Communication Base Station Antenna Sites
JF  - Frequenz
Y1  - 2009
U6  - http://dx.doi.org/10.1515/FREQ.2009.63.7-8.123
SN  - 2191-6349
VL  - 63
IS  - 7-8
SP  - 123
EP  - 128
ER  - 
TY  - JOUR
A1  - Bitz, Andreas
A1  - Felder, Jorg
A1  - Wittig, Tilmann
T1  - Designing MRI Coils with Aid of Simulation
JF  - Microwaves & RF
Y1  - 2013
SN  - 0745-2993
VL  - 52
IS  - 7
SP  - 56
PB  - Penton
CY  - Cleveland, Ohio
ER  - 
TY  - JOUR
A1  - Bank, Bart L. van de
A1  - Orzada, Stephan
A1  - Smits, Frits
A1  - Lagemaat, Miriam W.
A1  - Rodgers, Christopher T.
A1  - Bitz, Andreas
A1  - Scheenen, Tom W. J.
T1  - Optimized (31) P MRS in the human brain at 7 T with a dedicated RF coil setup
JF  - NMR in Biomedicine
Y1  - 2015
U6  - http://dx.doi.org/10.1002/nbm.3422
SN  - 1099-1492
VL  - 28
IS  - 11
SP  - 1570
EP  - 1578
PB  - Wiley
CY  - Weinheim
ER  -