Evaluation of initial setup accuracy and intrafraction motion for spine stereotactic body radiation therapy using stereotactic body frames

Zhaohui Han, John C. Bondeson, John H. Lewis, Edward G. Mannarino, Scott A. Friesen, Matthew M. Wagar, Tracy A. Balboni, Brian M. Alexander, Nils D. Arvold, David J. Sher, Fred L. Hacker