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MRI; SAR; Human model
Abstract:
We investigated effects of the geometry and size
of the cerebrospinal fluid (CSF) on transmit and safety
efficiencies in magnetic resonance imaging at 300 MHz. For the
human model investigated here and a head position at the top
of the RF coil, an increase of CSF space resulted in essential
degradation of the safety excitation efficiency without an easily
recognizable influence on the magnetic field distribution. For a
head location in the coil center, CSF space variation did not
significantly change the safety excitation and transmit
efficiencies. We note that the assumed geometries in our study
may not reflect in vivo conditions precisely and the results
cannot be readily generalized.
