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Figure 5 | Radiation Oncology

Figure 5

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 5

Effect of motion amplitude on threshold values based on maximum standard uptake values (TH max ), evaluated with water as the phantom background. (a) For a 37-mm sphere, the variance of THmax did not differ significantly between slow computed tomography (CT) scanning (SCS) and helical CT scanning (HCS). A significant difference was observed between the mean THmax of 30-, 20-, and 10-mm motion amplitudes compared with stationary conditions (Dunnett’s test: p < 0.05). The average THmax values for non-motion and motion were 0.404 and 0.244, respectively. (b) For a 28-mm sphere, the variance of THmax did not differ significantly between SCS and HCS. A significant difference was observed between the mean THmax of 30-, 20-, and 10-mm, motion amplitudes compared with stationary conditions (Dunnett’s test: p < 0.05). The average THmax values for non-motion and motion were 0.387 and 0.263, respectively.

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Radiation Oncology

ISSN: 1748-717X

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