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  1. Responses From Device Manufacturers on Device Specifications and Compatible Accessories (January 2010) - Stereotactic ... 
    https://www.ncbi.nlm.nih.gov/books/NBK55725
    ... Tumor Tracking (e.g., fiducials, third party, manufacturer) Active Breathing Coordinator (ABC) and/or Elekta Symmetry 4D cone-beam ... AAPM: American Association of Physicists in Medicine ABC: Active Breathing Coordinator ASTRO: American Society for Radiation Oncology cGY/min: ...