RT Journal Article SR Electronic T1 The Pinwheel Sign: Artifact from Head Rotation During SPECT Acquisition for Dopamine Transporter Imaging JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 75 OP 76 DO 10.2967/jnmt.113.126078 VO 42 IS 1 A1 Amy K. Janicek A1 Ryan J. Avery A1 Phillip H. Kuo YR 2014 UL http://tech.snmjournals.org/content/42/1/75.abstract AB 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.