A5) Possible solutions Biofeedback/coaching techniques are being increasingly embedded in the behavioral treatment of patients with lung disease such as chronic obstructive pulmonary disease, asthma, and cystic fibrosis. For respiratory gating, several studies suggest that verbal prompts improve respiration reproducibility. Kini et al.12 concluded that audio prompts improve the stability of respiration frequency of the patient but does not maintain the range of respiratory motion, whereas visual prompts control only the regularity of the displacement and the frequency is not reproducible. Based on the results of Kini et al.12, combined audio-visual biofeedback was devised to improve the reproducibility of respiration motion. Recently Neicu et al.13 described results of audio and visual prompting and demonstrated improvement in the efficacy of so-called synchronized moving aperture radiation therapy, using respiratory traces from single-patient and volunteer sessions.