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(a) Varian respiratory gating system uses an IR reflective marker. (Image provided courtesy of Varian) (b) align RT/OSMS is an optical surface monitoring device (image courtesy of Vision RT) (Vision RT, London, UK). (c) Elekta Active Breathing Coordinator (ABC) uses a spirometer to monitor lung volume (Courtesy, Helen McNair). (d) The Anzai pressure belt (Anzai Medical, Tokyo, Japan) monitors changes of the abdominal circumference.
