Preliminary Retrospective Analysis of Daily Tomotherapy Output Constancy Checks Using Statistical Process Control.

175, the static output showed a decreasing trend with respect to the dynamic output check, after which it began to oscillate around its CL.

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Although the static output was within the control limits (as confirmed in the EWMA chart, Fig 3A ) with the exception of data point 108 reported as a non correct chamber positioning inside the phantom, the dynamic output revealed an increasing trend starting from measurement no. 119 until measurement no. 156, after which the dynamic output checks oscillated around the UCL.

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