Table 4.
Comparison of methods to calculate washout rates
| Method | PLn | PLb | PMpx | PMave | Ssum | Ssec |
|---|---|---|---|---|---|---|
| Definition |
Planar without BG correction |
Planar with BG correction | Polar map Pixel-based WR | Polar map Averaged counts | SAsum total |
SAsum 8 sectors |
| Planar/SPECT | Anterior image | Anterior image | SPECT | SPECT |
SPECT short-axis image |
SPECT short-axis image |
| Averaged myocardial wall counts | Yes | Yes | – | – | Yes | Yes |
| Max count on profile curve | – | – | Yes | Yes | – | – |
| Background exclusion | No | Yes | Yes | Yes | Yes | Yes |
| Defect exclusion | No | No | Possible | No | No | Possible |
| Cavity count exclusion | No | No | Yes | Yes | No | Yes |
| Overlapping organ count | Yes | Yes | No | No | No | No |
Abbreviations of six methods: see Table 2 footnotes