The "swinging" tube: a new concept.
A new technique converts a standard biased x-ray tube into a microfocal spot tube with a clinically useful loading capacity. If the tube is pivoted exactly through the focal spot, the film can be scanned with a 5-10 cm wide beam and cover a 17-inch field. Then the target angle can be decreased to a few degrees. The width of the focal spot can be decreased using a grid bias.
D011859:Radiography / Q000295:instrumentation* / Q000379:methods