How would you incorporate whole abdomen radiation therapy after cytoreduction in an AYA patient with desmoplastic small round cell tumor?

We had one patient with DSRCT. Our group used IMRT for the abdominal radiotherapy while sparing much of the kidneys. The details are in a paper by Pinnix et el, Int J Rad Onc Bio Phys 83(1): 317-26, 2012. (Epub November 2011).