A Feasibility Study To Verify The Radiotherapy Plan Using A Third-party Planning System

To assess the feasibility and accuracy of “secondary check” by the third-party treatment planning systems. Choosing the Linatech treatment planning system,researched and developed by Linatech company, as the third-party check tools. All of experiment is based on the Varian Trilogy Accelerator First, dosimetric precision is compared between AAA algorithm and Acuros XB algorithm. After the accuracy verification, using Linatech TPS for recomputing treatment plans for geometrical phantoms designed in TG-119 and patients. after computation, compared the point dose with the measured data of phantoms(Using chameber No.2571 to measure point dose)and original plans. Using PTW verisoft with a criteria of 3% dose difference and3 mm distance to agreement to assess the dose distribution on center level.After then,you can assess the accuracy of treatment plans. For comparing measured data with recomputed plans and original plans, the dose data were found basically identical in TG-119 phantoms. And for patients,the differences between recomputed plans and AAA original plans or Acuros XB original plans were smaller in breast cancer, but they were even bigger in nasopharynx cancer., all patient cases showed a gamma passing rate more than 90%.The gamma passing rate of AAA original plans and Acuros XB original plans were(98.9±1.69)% and(98.8±0.81)%for breast cancer, and(92.6±3.46)% and(93.5±3.12)%for nasopharynx cancer. Utilizing the third-party treatment planning system as a third-party check tools to assess the accuracy of plans is a newer and more convenient method to quality assurance,but some functions still need to improve and the scope of differences still need more patient cases to determine.