Subjective and objective quantification of physician's workload and performance during radiation therapy planning tasks

The NASA-TLX may provide a reasonable method to quantify subjective workload for broad activities, and objective physiologic eye-based measures may be useful to monitor workload for more granular tasks within activities. The subjective and objective measures, as herein quantified, do not necessarily track each other, and more work is needed to assess their utilities. From a series of controlled experiments, we found that performance appears to decline at subjective workload levels ≥ 55 (as measured via NASA-TLX), which is consistent with findings from other industries.