Interstitial X-ray needle.

摘要

An interstitial X-ray needle (10) includes an elongated X-ray tube (24) coupled to an electron emitter (16) at one end of the tube, with a converter element (26) being disposed at a tip (36) of the other end of the tube for converting emitted electrons into X-rays; a solenoid coil (28) wound around the tube for providing a magnetic field that confines the emitted electrons within a narrow beam; an elongated outer casing (30) enclosing the tube and coil: and a pipe (32) coaxially disposed between the casing and the tube for defining an inner annular flow chamber (38) between the tip (36) of the tube and a coolant inlet (40) in the casing (30) and an outer annular flow chamber (42) between the tip (36) of the tube and a coolant outlet (44) in the casing. <IMAGE>