Marcus Prier1,2, Max Joris Hubmann1,2, Enrico Pannicke1,2, and Oliver Speck1,2
1Otto-von-Guericke University, Magdeburg, Germany, 2Research Campus STIMULATE, Magdeburg, Germany
1Otto-von-Guericke University, Magdeburg, Germany, 2Research Campus STIMULATE, Magdeburg, Germany
A low cost, stand-alone RF power monitor was developed that fulfills the
requirements given in the standard 60601-2-33 and is based on electrical
standard components. Evaluation measurements show power measurement and RFPA
blanking switching times accuracies with an error less than 1%.
Figure 1: The proposed SAR
Monitor consists of two dual directional couplers (1,2), two RMS envelope
filters (3) and a microcontroller (4).
Figure 4: A block
diagram of the proposed SAR monitor, that handles power limit exceedance and RF-coil
errors for a standard MRI RF transmit / receive setup.
