Table 1.

Detailed description of the boluses used in the present study. Each consistency is also described with the standardized terminology according to the International Dysphagia Diet Standardisation Initiative (IDDSI) [19]

Bolus number	Bolus size and consistency (level according to the IDDSI framework [19])	Contrast
1	3 ml thin liquid (0)	Mixobar Colon 1 g Barium/ml mixed with equal amount of water
2	5 ml thin liquid (0)
3	10 ml thin liquid (0)
4	20 ml thin liquid, drink freely (0)
5	5 ml mildly thick (2)	Omnipaque 300 mg Iodine/ml; 20 ml Omnipaque mixed with 2 ml instant thickener
6	3 ml extremely thick (4)	Omnipaque 300 mg Iodine/ml; 20 ml Omnipaque mixed with 15 ml instant chocolate pudding mix