Adaptive planning
prostate
PROSTATE

Adaptive planning is mandatory for all subjects on the 2 fraction arm. The need for adaptive planning will be assessed for all subjects on the 5 fraction arm on a per treatment basis.Prior to treatment, each patient will undergo a scout/set-up MRI scan followed by the treatment planning quality (~ 3 min) true fast imaging with steady-state free progression (TRUFI) scan.2D shifts will be performed to align relevant anatomy (bladder, rectum, prostate ± seminal vesicles).Simulation contours will be rigidly copied to the set-up scan and recontoured if CTV or boost (optional) delineation changes. OAR should be contoured within a 3 cm contouring ring.Predict dose algorithm will determine if treatment dose parameters meet planning dose parameters.Patients will undergo adaptive planning if treatment dose parameters do not meet planning parameters and protocol mandatory planning parameters (see Additional file 