[The research on two different algorithms used in generating MLC fields of IMRT plan].
OBJECTIVE
To validate that DMPO model for "one step" algorithm can reduce the total MLC segments number, we compare the dosage distribution of "one-step" algorithm with "two-step" algorithm for generating IMRT MLC segments.


METHODS
On the platform of "Pinnacle 8.0h" version radiation treatment planning system developed by Philips, we respectively select one head and neck tumor case, one thorax tumor case and one abdomen tumor case, by means of designing seven fields IMRT planning, then utilized "one-step" algorithm and "two-step" algorithm to optimize and generate IMRT MLC segments, and then calculated dosage distribution, evaluated dosage distribution lines and DVH diagram, in order to compare the two MLC segment groups generated by the two different algorithm.


RESULTS
For the three IMRT plans selected by us, the number of MLC segments generated by "two-step" algorithm appear to be larger than "one-step" algorithm but dosage distribution seems to be worse than the latter.


CONCLUSIONS
For utilizing the "Pinnacle" plan system to design IMRT plan, "one-step" algorithm with "DMPO" definitely can effectively reduce the number of MLC segments, what's more, the result of dosage distribution seems to be better.
Dept. of Biomedical Engineering, School of Southern Medicine University, Guang Zhou 510515. 358541260@qq.com
Jingqing
J
Zeng
Linghong
L
Zhou
D000465:Algorithms; D011879:Radiotherapy Dosage; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*