Welcome. The other aspect with the nasal tube vs a gastric feeding tube is taking the time out to do surgery, risks of surgery, for a peg tube, including missed treatments, risk of infection with low blood counts. There is a procedure where a radiologist can put in a peg under x-ray or CT guidance resulting in no time loss, no surgery, forgot the name of it, too early to think. Any missed radiation treatments will have to be made up by coming in a 6th day, tacked on the end, and some do twice a day treatments instead, but it's not advisable to miss any days, unless necessary. Good luck.
It is called Fluoroscopic guided Percutaneous Gastronomy or another may be Percutaneous Radiologic Gastroneous using push type gastronomy with CT and Fluoroscopy guidance.
http://radiology.rsna.org/content/210/3/651.full