Which is more important, or more valuable to a dr; a mri or a ct scan?

Depends: Which test provides more info depends on what you are looking for. Both are very good imaging tests but at times one is better than the other. Mri's are more expensive and take longer to perform but may show for example small changes in the brain after stroke ct can miss but ct is better for looking for acute bleeding in the head so all depends.

It depends: Vonn: these exams work in different ways and it would depend on what your doctor is looking for as to which test might yield the best or most productive result. There are even many instances where both tests are done. I would not label one as more valuable or more important over the other.