Table 3.
Delineation method | Volume obtained from SUV image (mL) | Volume obtained from Patlak image (mL) | % Median differencea | P value | P valueb | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Mean | Median | Min | Max | Mean | Median | Min | Max | ||||
VOI50 | 190.4 | 15.4 | 2.7 | 2297.8 | 65.2 | 10.1 | 2.1 | 822.9 | 28.1 | < 0.001 | < 0.001 |
VOI70 | 10.5 | 3.9 | 1.3 | 57.6 | 8.8 | 3.5 | 1.0 | 45.2 | 18.5 | < 0.001 | < 0.001 |
VOIA41 | 195.4 | 28.6 | 3.3 | 2402.5 | 86.1 | 11.9 | 2.5 | 1257.6 | 16.5 | < 0.001 | < 0.001 |
VOIA50 | 20.3 | 6.0 | 2.1 | 121.2 | 22.2 | 6.8 | 1.9 | 107.3 | 8.1 | 0.364 | 0.215 |
VOIA70 | 5.1 | 1.7 | 0.7 | 38.8 | 6.57 | 2.38 | 0.51 | 34.26 | -13.3 | 0.001 | 0.001 |
VOIRTL | 33.3 | 7.2 | 0.3 | 538.2 | 17.78 | 6.75 | 0.26 | 111.14 | 7.5 | 0.040 | 0.042 |
VOISchaefer | 158.0 | 14.7 | 3.4 | 2212.0 | 48.1 | 13.0 | 2.5 | 564.6 | 8.3 | 0.003 | 0.004 |
GradWT1 | 43.5 | 32.8 | 9.1 | 223.5 | 51.2 | 43.2 | 10.2 | 229.4 | -9.1 | 0.025 | 0.085 |
GradWT2 | 12.4 | 6.8 | 1.5 | 74.1 | 14.2 | 8.6 | 1.6 | 85.3 | -2.1 | 0.625 | 1.000 |
aThe percentage difference was defined as . The average tumor-to-background ratio was 7.4 (range 2.4 to 31.6) and 16.0 (range 3.0 to 32.0) when derived from SUV and Patlak images, respectively. bWithout visual outliers. SUV, standardized uptake value; min, minimum; max, maximum; VOI, volumes of interest; GradWT1, gradient-based watershed first approach; GradWT2, gradient-based watershed second approach.