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Figure 7 | Radiation Oncology

Figure 7

From: Commissioning and early experience with a new-generation low-energy linear accelerator with advanced delivery and imaging functionalities

Figure 7

Comprehensive test of the stability of the imaging center. (including PV mechanical stability and gantry sag motion) from monthly quality assurance procedures. Test was performed acquiring portal images in continuous (cine) mode with a full gantry rotation. The graph reported an example of the actual distance of the center C of the small radiation field from the physical image center in the X and Y directions as a function of the gantry angle; the histogram showed the average deviations observed over a test period of one year as well as the maximum distance, the maximum deviation in X and in Y directions and also the maximum excursion of the deviations; error bars are expressed as 1 standard deviation.

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