In each image, top images are in short-axis orientation (SAX), and
bottom images are in horizontal- and vertical (long)-axis orientation (HLA,
VLA). Yellow circles show initial masks, and LV contours are shown in white.
Panel (A) shows an example of mask-failure due to extracardiac activity. Panel
(B) shows an example of valve-plane overshooting.
Adapted from Xu Y, Kavanagh P, Fish M, et al. Automated
Quality Control for Segmentation of Myocardial Perfusion SPECT. J Nucl Med
2009;50:1418–26; with permission.