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Figure 2 | Radiation Oncology

Figure 2

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 2

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

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Radiation Oncology

ISSN: 1748-717X

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