Fig. 1
Hashtag frequencies. A Frequency of the most-used hashtags in 2019 and 2020 (excluding the congress hashtags #rsna19, #rsna2019, #rsna20, #rsna2020). The percentage share of individual hashtags in the total volume of hashtags during a year is shown. B Illustrates the largest absolute differences of hashtag frequencies in 2019 compared to 2020 in relation to total tweet count (total number of #radxx 2019: 254, 2020: 63; #weareradiology 2019: 203, 2020: 61; #pinksocks 2019: 132; 2020: 12; #some 2019: 104, 2020: 15; #chicago 2019: 157, 2020: 28; #jacr 2019: 132, 2020: 250; #nnox 2019: 0, 2020: 82; #radaichat 2019: 0, 2020: 152; #covid-19 2019: 0, 2020: 169)