Object: To investigate the statistic relationship between 5 clock positions of CTDI100 and stabilization of radiation. Method: Radiation meter and phantom are used to 12 time repeating tests on the radiation dose of a spiral CT at 5 Clock positions and then one-way ANOVA method is used to character the their difference significance of those 5 clock positions. Result: The relevant standard difference of measurements at 5 test clock positions are 0.33%(center), 0.73%(3 clock), 0.32%(6 clock), 1.00%(9 clock), ...
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