1. A system comprising: a magnetic resonance imaging (MRI) processor, the processor including an MRI low-level signal detection process stored in a memory; a MRI scanner coupled to the processor; a control unit coupled to the processor; a display coupled to the processor; and a medical device adapted to insert into an anatomy, the medical device having a plurality of target markers, wherein geometric information for the plurality of target markers is stored in the memory prior to insertion of the medical device into the anatomy, and wherein MRI signals of the plurality of target markers within the anatomy are not detectable or are disregardable as noise for the system (a) without the MRI low-level signal detection process and (b) without using the stored geometric information of the plurality of target markers prior to insertion of the medical device into the anatomy to lower an MRI signal detection threshold.