You will have to remove your jewellery and avoid wearing clothes with metal objects like metal zips, studs etc. which might interfere with the image
Depending on the area to be imaged, you may be asked to wear a hospital gown at the time of the scan.
Pregnant women should inform their doctor (and x-ray technician) as the radiations may affect the fetus. If needed, precautions can be taken to lower the radiation exposure to the fetus.