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| Average values of bed method placement technology in the application of IMRT of cervical vertebra bone metastases |
| ZHANG Yangfan, BI Jingling, HUANG Yong |
| Department of Oncology, Guangde Road, Hefei Second People's Hospital, Hefei 230011 China |
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Abstract Objective Using KV cone beam CT (cone beam CT, CBCT) image boot scanning technology, to investigate the feasibility of average values of bed method placement technology in intensity modulated radiation therapy (IMRT) for cervical vertebra bone metastases. Methods Each patient was given CBCT scan for 30 times and record the value of three directions each time, including left and right (X)、before and rear (Y)and up and down (Z), take the mean of the previous five times x=(x1+x2+…x5)/5, y=(y1+y2+…y5)/5, z=(z1+z2+…z5)/5, as the value of bed positioning and compare with physicist planned bed value x0, y0, z0. to compute the average upset error, which on X axis is Lat5=x5-x0, Y axis is Lng5=y5-y0, Z axis is Vrt5=z5-z0. Consider the mean of the first five setup errors as the system error and consider the standard deviation of the setup errors in all times as the random error to conduct independent t-test. Results Statistical analysis of system error and random error there was no significant difference (P> 0.05), the left and right, front and back, up and down three dimension error is <0.3 cm within the allowable range. Conclusion The application of average values of bed method placement technology in IMRT for cervical vertebra bone metastases is feasible.
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Received: 11 March 2018
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