Fig. 1

Contrast agent use in MRI: Analysis by MRI type, location, year, and disease duration since 2019. (a) Frequency of Gd administration in MRI examinations by type/location of examination and calendar year. The shaded areas represent the associated 95% confidence intervals. (b) Frequency of contrast agent administration in MRI examinations broken down by type/location of examination and duration of disease. The shaded areas represent the corresponding 95% confidence intervals. (c) Venn diagram of MRI examinations since January 1, 2019 by type: cranial vs. spinal separated by with vs. without contrast agent administration. *There are 61 MRI examinations in which both a cranial and a spinal MRI were performed, but Gd was only used in one type of MRI (Gd may have been given between both MRI). These rare cases were excluded from further analyses. Gd– Gadolinium-based contrast agents; MRI– Magnetic Resonance Imaging