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  - Noureddine, Yacine
A1  - Kraff, Oliver
A1  - Ladd, Mark E.
A1  - Wrede, Karsten H.
A1  - Chen, Bixia
A1  - Quick, Harald H.
A1  - Schaefers, Gregor
A1  - Bitz, Andreas
T1  - In vitro and in silico assessment of RF-induced heating around intracranial aneurysm clips at 7 Tesla
JF  - Magnetic Resonance in Medicine
Y1  - 2017
U6  - http://dx.doi.org/10.1002/mrm.26650
SN  - 1522-2594
IS  - Early view
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Kraff, Oliver
A1  - Wrede, Karsten H.
A1  - Schoemberg, Tobias
A1  - Dammann, Philipp
A1  - Noureddine, Yacine
A1  - Orzada, Stephan
A1  - Ladd, Mark E.
A1  - Bitz, Andreas
T1  - MR safety assessment of potential RF heating from cranial fixation plates at 7 T
JF  - Medical Physics
Y1  - 2013
U6  - http://dx.doi.org/10.1118/1.4795347
SN  - 2473-4209
VL  - 40
IS  - 4
SP  - 042302-1
EP  - 042302-10
PB  - Wiley
CY  - Hoboken
ER  -