The result shows that the on-linecorrection has gre.
结果表明，在线修正具有重要的意义。
2
Conclusion the cone beam ct and on-linecorrection could reduce the setup error.
结论锥束CT扫描在线校正能够缩小摆位误差。
3
Some problems that must be paid attention to during on-linecorrection and production of instrument control system, such as preparation, safety and precision, are described in this paper.