A simple theoretical verification of monitor unit calculation for intensity modulated beams using dynamic mini-multileaf collimation.
A spreadsheet based program is presented to perform an independent Monitor Unit (MU) calculation verification for the Quality Assurance (QA) of Intensity Modulated Radiation Therapy (IMRT) using Dynamic MultiLeaf Collimation (DMLC). The computed dose value is compared to the planned dose by calculating the percent dose difference per Intensity Modulated Beam (IMB) and absolute dose difference per IMB. The proposed acceptability levels are +/-5.0% or +/-2.0 cGy for the percent dose difference per IMB and the absolute dose difference per IMB, respectively. For percent dose difference per treatment, an acceptability level of +/-2.0% is proposed. The presented program is considered adequate for checking the treatment plans calculated for IMRT treatments using DMLC as a part of the QA procedure.
Linthout
Nadine
N
Department of Radiotherapy, Oncology Center, Academic Hospital-Free University Brussels, Laarbeeklaan 101, B-1090 Brussels, Belgium.
Verellen
Dirk
D
Van Acker
Swana
S
Storme
Guy
G
D004307:Dose-Response Relationship, Radiation; D006801:Humans; D010315:Particle Accelerators / Q000295:instrumentation; D019047:Phantoms, Imaging; D011786:Quality Control; D011832:Radiation Injuries / Q000517:prevention & control; D011834:Radiation Monitoring / Q000295:instrumentation*; D018787:Radiation Oncology; D011836:Radiation Tolerance; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D020266:Radiotherapy, Conformal / Q000295:instrumentation* / Q000379:methods; D012680:Sensitivity and Specificity; D012984:Software