The present invention pertains to a process for synthesizing nano-scale yttrium aluminum garnet fluorescent powders having formula :O12\u2003\u2003wherein R1 and R2 are independently selected from the elements consisting of rare earth metals and transition metals, and each of x and y is independently a value between 0 and 1. This novel strain has been characterized on the basis of phenotypic traits, 16S rDNA sequence analysis and DNA-DNA hybridization. To reduce or even minimize the attenuation of PET radiation in a combined MRPET device and thus in particular to ensure a better signal to noise ratio for the PET measurement, it is proposed according to at least one embodiment of the invention that the surfaces of the wall away from the object are essentially tangential to the examination object. 11 abg by a single dual-band RF module, and therefore the circuit size, power dissipation, component count, and cost can be dramatically reduced. The display unit is configured such that it can be moved to enable different display fields to be viewed.