In SPECT nuclear cardiology studies a 20-segment model has also been used [2]. It is similar to the 17-segment model, but the apical part is divided into 8 segments instead of 5 as illustrated by the polar arrangement below.
Basal Segments |
Mid-cavity Segments |
Apical Segments |
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1. |
basal anterior |
7. |
mid anterior |
13. |
apical anterior |
2. |
basal anteroseptal |
8. |
mid anteroseptal |
14. |
apical anteroseptal |
3. |
basal inferoseptal |
9. |
mid inferoseptal |
15. |
apical inferoseptal |
4. |
basal inferior |
10. |
mid inferior |
16. |
apical inferior |
5. |
basal inferolateral |
11. |
mid inferolateral |
17. |
apical inferolateral |
6. |
basal anterolateral |
12. |
mid anterolateral |
18. |
apical anterolateral |
19. |
anteroapical |
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20. |
inferoapical |