Comparison of breath-hold and free-breathing positions of an external fiducial by analysis of respiratory traces.

In most cases, the p value was < 0.001 , indicating highly significant differences between the FB and BH extrema positions.

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Practically, however, there may be significant normal tissue sparing with the BH insp protocol as is evident during deep‐inspiration breath hold (DIBH) radiation therapy. 16 , 19 , 24 One reason for the differences between the BH and FB extrema positions is that during BH scanning, patients can contract or relax their abdominal muscles, causing the external fiducial to move significantly without any corresponding changes in lung volume or tumor position.

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