National trends in contrast media enhanced and unenhanced computed tomography use.

• In the seven years before the COVID-19 pandemic, the use of both enhanced and unenhanced CT has been consistently increasing. • Temporal trends in enhanced and unenhanced computed tomography use are significantly associated. • In the first year of the COVID-19 pandemic, there was a marked decrease in both enhanced and unenhanced CT use. • If pre-pandemic CT use trends continue, a further increase in contrast media supply will be necessary. [ABSTRACT FROM AUTHOR]