The pinwheel sign: Artifact from head rotation during SPECT acquisition for dopamine transporter imaging

Abstract

This case study illustrates the pattern and significance of the pinwheel sign, a SPECT artifact from rotational head motion that can complicate the diagnosis of Parkinson disease. Monitoring the patient during image acquisition is crucial since rotational motion artifacts are difficult to identify on raw or processed images and may lead to incorrect interpretation of findings. © 2014 by the Society of Nuclear Medicine and Molecular Imaging, Inc.