Treatment Time and Acceptance
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The median treatment time of a single fraction was 4 (1.5-11) min. The median number of breath hold repetition per single treatment was 4 (2-9) times. The questionnaires were completed by all 20 patients with a median age of 45 years (range: 27-63) and 9 therapists with a median age of 37 years (range: 25-57) and median working years of 12 (range: 1-38). The average score for the acceptance of VDIBH by patients and therapists were 8.7 ± 0.9 (out of 12) and 10.6 ± 3.2 (out of 15), respectively, indicating good acceptance of the technique by both patients and therapists (The average score for the acceptance of optical surface monitoring system (OSMS)-assisted voluntary deep inspiration breath-hold (VDIBH) treatment by patients (A) and radiotherapists (B).