Pearls and Pitfalls of Quantitative Software Analysis of Dopamine Transporter SPECT.

Dopamine transporter SPECT with I-N-ω-fluoropropyl-2ß-carbomethoxy-3ß-(4-iodophenyl) nortropane (I-ioflupane) aids in the diagnosis of parkinsonian syndrome by demonstrating loss of striatal dopamine transporters, proportional to nigrostriatal dopaminergic neuronal loss. Quantitative software analysis (QSA) is a helpful adjunct to visual interpretation. An atlas of pearls and pitfalls of QSA is presented. Examples include correction for head tilt/orientation, scaling artifacts, and detection of balanced loss of activity. Additional examples are provided where QSA can potentially fail such as patient variation and vascular disease.