Table 2 Mean lung shunt fraction (with standard deviation in parenthesis) corresponding to planar and SPECT/CT scans of the phantom

Actual

0.0%

3.6%

6.9%

Planar (anterior liver, posterior lung)

1.67% (0.01%)

5.12% (0.03%)

8.21% (0.05%)

Planar (geometric mean)

2.46% (0.02%)

8.17% (0.03%)

13.39% (0.02%)

SPECT/CT without corrections

1.28% (0.01%)

7.15% (0.02%)

12.13% (0.03%)

SPECT/CT with AC

0.67% (0.01%)

3.98% (0.02%)

6.83% (0.03%)

SPECT/CT with AC and SC

0.10% (0.07%)

3.10% (0.01%)

6.22% (0.03%)