Comparison of normal tissue integral dose with monitor units from 3DCRT, IMRT, and Rapid Arc treatment planning methods for head and neck, pelvic and thoracic cancer sites

Background: comparison of normal tissue integral dose and treatment monitor units from 3dcrt, imrt and rapid treatment plan for oesophagus, left breast, cervical and oropharynx cancer. the calculated normal tissue integral dose from different treatment plans with static and dynamic leaf positions, such as 3dcrt, imrt and rapid arc were compared with the generated mu. material and methods: nine patients from oesophagus, left breast and cervix cancer and twelve patients from oropharynx cancer with a total of one hundred and thirty-five generated plans from 3dcrt, imrt and rapid arc were analysed. the normal tissue integral dose (ntid) was calculated from in-house developed python software using a standard formula from the dose-volume histogram. results: the analysis showed that the ntid and mu differed significantly from all three treatment planning methods and cancer sites. the highest integral dose was from imrt and rapid arc in the oropharynx and oesophagus cancer site; cervical cancer had a 50% lower ntid, and left breast cancer had a 25% lower ntid than oesophageal cancer. conclusion: the results show that ntid is inversely related to body volume, and that mu depends on the type of treatment planning (greater in imrt).