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Figure 7 | Radiation Oncology

Figure 7

From: Initial investigation using statistical process control for quality control of accelerator beam steering

Figure 7

Process control chart warning results. Bars indicate the number of days prior to failure that an action level threshold was first triggered for each of the monitored steering coil parameters. A - High Alarm triggered indicating parameters exceeding ± 6 standard deviations of the mean weekly sample value. B - Low alarm indicating the observation of nine consecutive weekly samples on one side of the mean. C - Low alarm indicating the observation of two out of three consecutive weekly samples greater than two standard deviations from the mean but not exceeding the high alarm limit.

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