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Recent technical advancements allow cardiac MRI (CMR) examinations in thepresence of so-called MRI conditional active cardiac implants at 3.0T. However,the artifact burden caused by susceptibility effects remain an obstacle. Allmeasurements were obtained at a clinical 3.0T scanner using an in-housedesigned cubic phantom and optimized sequences for artifact evaluation (3Dgradient echo sequence, multi-slice 2D turbo spin echo sequence), as well asreference sequences according to the ASTM were applied. Four representativeactive cardiac devices and a generic setup were analysed regarding volume andshape of the signal void. For analysis, a threshold operation applied to thegrey value profle of each data data set was used. The presented approach allowsthe evaluation of signal void and shape even for larger implants such as ICDs.The void shape is influenced by the orientation of the B0-field and the chosensequence type, as well as the distribution of magnetic material within theimplants. The void volume depends both on the device itself, and the sequencetype. Disturbances in the B0 and B1 fields exceed the visual signal void. Thiswork presents a reproducible and highly defined approach towards characterisingboth signal void artifacts at 3.0T and their influencing factors.

Three-dimensional assessment of susceptibility-induced signal voids caused by active cardiac implants in the setting of 3.0T CMR