Hello Marietta and welcome.
Echo the advice from the others. Not just brussel sprouts though. Any fibrous veg, especially cruciferous (cabbage, cauli,even peas) can cause wind so perhaps a bland diet the day before. Bread sometimes bloats people too
I wish him good luck for the scan. What a pity he didn't have a technician with the same determination as dave, but unfortuntely time's money as far as the NHS is concerned.