A medical imaging system is provided that includes a first gantry having a plurality of first detector units coupled within a bore of the first gantry such that the first detector units form a first field of view (FOV) of the first gantry. The first detector units are configured to acquire SPECT data. Further, the medical imaging system includes a second gantry having a plurality of second detector units coupled within a bore of the second gantry such that the second detector units form a second FOV of the second gantry. The second detector units are configured to acquire x-ray CT data. The second gantry is positioned adjacent to the first gantry. The medical imaging system also includes a patient table movable through the bores and a controller unit configured to control a rotation speed of the first detector units and the second detector units around the examination axis.
