IMRT

Treatment times

➔ Conventional 3D CRT treatments usually take no more than a few minutes ● Low number of treatment beams

➔ IMRT delivery times range usually from 3 to 15 minutes BUT depending on: ● Machine type ● Delivery method (SMLC, DMLC, IMAT, VMAT, …) ● Amount of IMRT beams/segments ● Tumor complexity (Volume, surrounding OAR, …) ● Fraction size (hypofractionation schemes) treatment times can increase to as long as 20 to 40 minutes ➔ Why are short treatment times preferable? ➔ Can Rotational IMRT techniques bring down the treatment times?