Correlation of improved local SAR deposition with reduced shading close to hip implants
Thomas Lottner 1,2 , Mathias Nittka 1 , Theresa Bachschmidt 1,3 , Heiko Meyer 1 , and Wolfgang Nitz 1,2
Siemens Healthcare, Erlangen, Germany,
of Regensburg, Regensburg, Germany,
Physics 5, University of Wrzburg, Wrzburg, Germany
Changing the B1 polarization has shown to reduce
artifacts due to induced currents in metallic implants.
The presented work aims to show that the right
elliptical polarization not just improves image quality,
but furthermore decrease the SAR value near the implant.
Numerical simulations were performed on a human male
with a simplified implant model placed in his right
femoral bone. The optimal polarization was approximated
by an analytical model. The optimized and the circular
polarization were compared and a significant increase of
B1 homogeneity and decrease in local SAR was shown for
the elliptical polarization.
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