Skip to main content
Figure 4 | Radiation Oncology

Figure 4

From: The use of positron emission tomography/computed tomography imaging in radiation therapy: a phantom study for setting internal target volume of biological target volume

Figure 4

Effect of motion amplitude on threshold values based on maximum standard uptake values (TH max ), evaluated with air as the phantom background. (a) The variance of THmax with slow computed tomography (CT) scanning (SCS) was significantly smaller than that of THmax with helical CT scanning (HCS) for a 37-mm sphere with 10-, 20- and 30-mm amplitudes (F-test: p < 0.05). A significant difference was observed comparing the mean THmax of 30-, 20-, and 10-mm motion amplitudes with stationary conditions (Dunnett’s test: p < 0.05). The average THmax value for non-motion was 0.362. (b) The variance of THmax with SCS was significantly smaller than that of THmax with HCS for a 28-mm sphere with 30-mm amplitude (F-test: p < 0.05). A significant difference was observed when comparing the mean THmax of 30-, 20-, and 10-mm motion amplitudes with stationary conditions (Dunnett’s test: p < 0.05). The average THmax value for non-motion was 0.352.

Back to article page