Fig 2.

Supply-and-demand model for imaging volume. Imaging orders (demand) are scheduled for available slots in the future (supply); the thickness of the arrows corresponds to the relative number of examinations scheduled for each slot, with most scheduled for the same week. Most of these scheduled examinations are completed. Some are deferred, put into the backlog, and rescheduled. Several factors affected supply and demand during the pandemic: supply was decreased because of government restrictions and enhanced precautions, while demand was reduced because of patients’ cancelling examinations, deferring care, and otherwise not wanting to be in a hospital during a pandemic, while doctors ordered fewer examinations for many reasons.