1Bedford J, Khoo V, Webb S, et al. Optimization of coplanar six-field techniques for conformal radiotherapy of the prostate. Int J Radiat Oncol Biol Phys, 2000,46: 231-238.
2Bedford J, Khoo V, Oldham M, et al. A comparison of coplanar fourfield techniques for conformal radiotherapy of prostate. Radiother Oncol,1999, 51:225-235.
3Bortfeld T, Schlegel W. Optimization of beam orientation in radiation therapy:some theoretical consideration. Phys Med Biol, 1993, 38:291-304.
4Rowbottom C, Khoo V, Webb S. Simultaneous optimization of beam orientation and beam weight in conformal radiotherapy. Med Phys,2001,28:1696-1702.
5Soderstrom S, Brahme A. Which is the most sutible numbers of photon beamportals in coplanar radiation therapy? Int J Radiat Oncol Biol Phys,1995,33:151-159.
6Gokhale P, Hussein E, Kulkami N. Determation of beam orientation in radiotherapy planning. Med Phys, 1994, 21:393-400.
7Sailer S, Rosenman J, Symon J, etal. The tetrad and hexad: maximum beam separation as a starting point for noncoplanar 3D treatment planning prostate cancer as a test case. Int J Radiat Oncol Biol Phys, 1994,30:439-446.
8Myrianthopoulos L, Chen G, Vijayakumar S, et al. Beam' s eye view volumetrics: an aid in rapid treatment plan development and evaluation.Int J Radiat Oncol Biol Phys, 1995,23:367-375.
9Das S, Marks L. Selection of coplanar or noncoplanar beams using threedimensional optimization based on maximum beam separation and minimized nontarget irradiation. Int J Radiat Oncol Biol Phys, 1997,38:643-655.
10Mageras G, Mohan R. Application of fast simulated annealing to optimization of conformal radiation treatment. Med Phys, 1993, 20:639-647.
7WU X G,ZHU Y P. Selection and determination of beam weights based on genetic algorithms for conformal radiotherapy treatment planning[J]. Phys Med Biol,2000,45:2 547-2 558.
8Li Yongjie,Yao Jonathan, Yao Dezhong. Automatic beam angles selection in IMRT planning using Genetic algorithm. Physics in Medicine and Biology[J]. 2004,49:268-1 932.
9Li Yongjie ,Yao Jonathan, Yao Dezhong. Genetic algorithm based automatic beam angles selection in IMRT [J]. Med Phys,2003,30 (6) :20-373.
10Boyer A L,Mok E C. Calculation of photon dose distributions in an inhomogeneous medium using convolutions[J]. Med Phys, 1986, 13 : 503-509.