Use of intravascular imaging across different races, hospitals, primary payer, and income, The bar graphs show the frequency of intravascular imaging, consisting of either intravascular ultrasound or optical coherence tomography, across different races (Fig. 2A), hospital regions (Fig. 2B), hospital bed sizes (Fig. 2C), hospital urban locations (Fig. 2D), primary payers (Fig. 2E), and median income quartiles (Fig. 2F).