Erratum

In the article “An Automated Method for Delineating a Reference Region Using Masked Volumewise Principal-Component Analysis in ¹¹C-PIB PET,” by Razifar et al. (J Nucl Med Technol. 2009;37:38–44), the figure panel letters in the legends of Figures 3 and 4 were incorrect. The MVW-PC1 images were, in fact, shown in panels A, D, and G; the MVW-PC2 images in panels B, E, and H; and the MVW-PC3 images in panels C, F, and I. The authors regret the error.