CD-US is an excellent choice for your situation of "monitoring." (It is also the imaging selection of choice for patients with metallic implants, such as pacemakers, who may not be candidates for MRI due to the interaction of the magnetic field with the metal in their bodies. Same is true for patients with kidney disorders due to problems flushing the contrast agent.)
Both CD-US and mpMRI require highly trained expertise to properly interpret results; Dr Bahn is one of the very best in the world at CD-US.HERE
is a link to a video of Dr Scholz talking about
another where he talks about
mpMRI. Both serve important functions.