Dosimetric comparison of 6MV flattening filter free beams and 6MV FF for single fraction streotactic radiosurgery treatment

Stereotactic Radiosurgery is widely used in radiotherapy to treat single or multiple brain metastatic tumor. There are many treatment technique for Brain SRS such as such as Gamma Knife, Cyber Knife, helical tomotherapy and linear accelerator. SRS treatment started with Gamma Knife but it was more time consuming and cumbersome, now days SRS treatment are, completely non invasion and frameless, that make patients more comfortable. Many publication shown that Rapid arc (VMAT) significantly reduced the treatment time compared with conventional IMRT techniques. The dose rate of FFF are substantially higher than FF that make shorter treatment time