SLC6A3 and dystonia 12: Functional neuroimaging evaluating the dopamine transporter with 11C-2beta-carbomethoxy-3beta-(4-fluorophenyl)-tropane PET and 123I-N-omega-fluoropropyl-2beta-carbomethoxy-3beta-(4-iodophenyl)-nortropane SPECT as well as evaluating CBF using 99mTc-hexamethylpropyleneamine oxime SPECT have also been unsuccessful in demonstrating RDP-associated abnormalities (6, 8).