University of Texas Medical School in Houston
[Neuroimaging including spine and brain CT, MRI, functional MRI, DAT scan, FDG PET, and SPECT.]
http://neurology.uth.tmc.edu/special...grams/ut-move/

It would be interesting to know what MRI test they did for your husband.
I see the DaTscan has been in Texas for a few years now..so it may have been it.

[DaT scans may become a critical tool is assisting in the diagnosis of Parkinson’s disease and related disorders. However, at this point, Parkinson’s disease is still something a physician, ideally a neurologist, must diagnosis. For classic cases of Parkinson’s disease, it is unlikely that most neurologists would order a DaT scan as they would feel confident in the diagnosis.

It is again important to state that the DaT scan is not going to be helpful in differentiating Parkinson’s disease from the related atypical parkisnonian syndromes. Still, if you are curious if a DaT scan may be appropriate for you, it is best to talk with your neurologist and discuss the pluses and minuses of pursuing this testing.]
http://www.ohsu.edu/blogs/brain/2013...nsons-disease/