SHIELD DEVICE FOR CONTROLLING THE DOSE OF X-RAYS APPLIED IN AN X-RAY MACHINE

摘要

A shield device for use with an X-ray machine. The shield device comprises a shaped shield preferably mounted with a transparent cylinder which is rotated about a longitudinal axis transverse to the path of X-rays produced by the machine to block out these X-rays for a longer period of time in some areas of the subject being X-rayed than in other areas during the time the X-ray picture is taken. This shield device can advantageously be used for obtaining differential X-ray exposure in one single shot.