Citation: Nishiyama S, Yoda K, Komatsu T. Reirradiation of spinal metastases using an add-on double-focus micro multileaf collimator and a three partial-arc conformal avoidance technique with optimized beam weights: a planning study. Journal of Diagnostic Imaging in Therapy. 2015; 2(2): 35-40.
Reirradiation of spinal metastases requires full consideration of previously delivered dose to the spinal cord thereby significantly constraining further dose delivery. The reirradiation of spinal metastases was frequently performed by Cyberknife or Tomotherapy. However, Cyberknife needs longer treatment time, possibly leading to a higher mental or physical burden to the patients with firm immobilization on the treatment couch, whereas Tomotherapy delivers rotational beams from all angles that may increase mean doses in organs at risk (OARs). Meanwhile, stereotactic body radiotherapy was also successfully employed for the reirradiation that allowed high dose to the target while sparing spinal cord and neighbouring OARs.
Keywords: reirradiation; spinal metastases; cyberknife; tomotherapy; micro multileaf collimator