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Study on Correction of Linear Accelerator Gantry Angle with Plumb Instrument

PENG Shun-you, LIANG Yi (Radiotherapy Center of Xiangfan Central Hospital, Xiangfan Hubei 441021,China )  
Objective To study how to correct the gantry angle of linear accelerator with plumb instrument. Methods To determine the gantry angle of linear accelerator by moving the gantry to make field central axis parallel with plumb. Results Maximum error of gantry angle was 0.2 degree when the gantry was corrected with plumb instrument. Conclusion It is convenient and accurate to determine the gantry angle of linear accelerator with plumb instrument.
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