Dose Evaluation Of Dynamic Multileaf Collimator In Intensity Modulated Radiation Therapy

Trere are two method of static(stop and shoot) and dynamic(sliding window) in intensity modulated radiation therapy. In intensity modulated radiation therapy, static method was conformed quality control for commissioning of radiation treatment planning, delivery of treatment information and process of treatment transport. Dynamic method have many problems in quality control because occur motion of multi_leaf and beam on together. In this paper, quality control of dynamic method were accomplished same method with quality control of static method in intensity modulated radiation therapy. In the result, measurement dose of dynamic MLC and static MLC in central point was different from 0.2%, 90% iosdose area was different from 2.7% and MU was different from 2%(371 vs 361) in clincal tumor volume under 5cm. The measurement dose of dynamic MLC and static MLC in central point was different from 0.2%. 90% iosdose area was different from 2.2% and MU was different from 21.7%(414 vs 340) in clincal tumor volume from 5cm to 10cm. The measurement dose of dynamic MLC and static MLC in central point was different from 0.4%, 90% iosdose area was different from 2.9% and MU was different from 58.9%(531 vs 334) in clincal tumor volume above 10cm.