Letter to the editor: "Utilization of CT and MRI scanning in Taiwan, 2000–2017".

Abbreviations CT Computed tomography ED Emergency Department MRI Magnetic resonance imaging NHI National Health Insurance OECD Organisation for Economics Co-operation and Development Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. We also found increasing trends of uncoded CT scans in emergency patients and self-pay CT scans in outpatients. This could lead to confusion that Taiwan had a low CT utilization rate in ED setting compared to other countries. For instance, in the emergency department (ED) setting, the reported rates of CT use in Taiwan ranged from 116 to 177 per 1000 ED visits during 2005-2013 [[2]-[4]], compared to rates reported in other countries ranging from 34 to 245 per 1000 ED visits (as summarized in Table 1) [[5]-[11]]. [Extracted from the article]