Nuclear Cardiology: Nuclear Cardiology:

Chapter 6 / SPECT Myocardial Perfusion Imaging 69Fig. 6-2. Computer screen display of the reorientation of reconstructed tomographicslices to the anatomical axis of the heart. The boundaries of the windowof reconstruction are indicated by red lines. The green lines indicate the anglesof tomographic slicing for the vertical long axis (VLA), horizontal long axis(HLA), and the short axis (SA).study should be repeated. Even if it appears that the program has correctedthe motion on cine display, the reconstructed slices should beinspected for motion artifacts. Typical motion artifacts are gaps at theapex of the long-axis slices and breaks in the short axis slices to makethem look disjointed. See Chapter 14 for examples.Note that some motion-correction programs are very specific andwork only on certain types of acquisition data. For instance, not allprograms are capable of correcting ECG-gated image data and somecorrect only 180° acquisition data and not 360° acquisition data.ReconstructionThis step reorients the data to the 3 axes of the patient’s heart. Horizontallong axis, vertical long axis, and short axis slices are created. It is