Nuclear Cardiology: Nuclear Cardiology:

Chapter 14 / Artifacts and Technical Problems in Cardiac Imaging 189Fig. 14-58. Incorrect slicing (vertical). In this example the angle of the anatomicallong axis of the left ventricle as a direction for slicing is incorrectly selectedfor the stress vertical long-axis limits. The angles for the rest images are correct.The incorrect angles result in nonstandard stress slices of the left ventricle. Thisis best appreciated in the horizontal long-axis slices. The stress images are at anunusual angle and point to the left. The stress vertical long-axis slices are apparentlyforeshortened compared to the rest slices. Some of the short-axis sliceshave an elliptical rather than circular shape.conventional coronal, transverse, and sagittal slices is difficult becausethe walls of the heart are cut tangentially. Therefore, tomographiccuts through the heart must be reoriented according to the anatomicalaxis of the left ventricle. Two conceivable mistakes can be made: (1) Theselection of long axis is not precisely along the anatomical axis of theheart. (2) The orientation of the selected axis in the stress and rest images