SLC6A3 and Parkinson disease: In this regard, it is of interest that Lee et al. proposed an image registration algorithm which can be used to register individual DAT SPECT ([99mTc]TRODAT was used as a radiotracer on a NanoSPECT/CT system) and brain MR images (acquired on a 3-T system) in rodent models of PD without using external markers [106].