Abstract

A linac-based X-ray system for cargo scanning and imaging applications uses linac design, RF power control, beam current control, and beam current pulse duration control to provide stable sequences of pulses having different energy levels or different doses.

IPC Classes  ?

• H05G 1/00 - X-ray apparatus involving X-ray tubesCircuits therefor
• H05G 2/00 - Apparatus or processes specially adapted for producing X-rays, not involving X-ray tubes, e.g. involving generation of a plasma
• H05H 7/02 - Circuits or systems for supplying or feeding radio-frequency energy
• H05G 1/20 - Power supply arrangements for feeding the X-ray tube with high-frequency ACPower supply arrangements for feeding the X-ray tube with pulse trains
• H05H 9/04 - Standing-wave linear accelerators

Abstract

An image-guided radiotherapy system adapted to be juxtaposed adjacent a CT scanner comprises a frame having an orifice adapted to permit passage therethrough of a couch on which a patient is positioned, together with a gantry assembly rotatably mounted on the frame in which the gantry assembly comprises a shielding cylinder having an orifice therethrough in alignment with the orifice in the frame. The shielding cylinder has affixed thereto a linac-based treatment head configured to provide radiotherapy, and a beamstop positioned angularly opposite the treatment head to absorb radiation from the treatment head. The shielding cylinder provides sufficient shielding of radiation scattered from the patient and the remainder of the system to not require a conventional vault. In some embodiments an arch may be used instead of a cylinder.

IPC Classes  ?

• A61N 5/10 - X-ray therapyGamma-ray therapyParticle-irradiation therapy
• G21F 7/00 - Shielded cells or rooms
• G21F 7/005 - Shielded passages through wallsLocksTransferring devices between rooms
• G21K 1/00 - Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
• H05G 1/02 - Constructional details

Abstract

A linac-based X-ray system for cargo scanning and imaging applications uses linac design, RF power control, beam current control, and beam current pulse duration control to provide stable sequences of interleaved pulses having different energy levels, for example alternating 4 MeV and 6 MeV pulses or other energies where the difference in levels is at least approximately 1 MeV and less than approximately 5 MeV. The pulse repetition rate can be 100-400 pulses per second or more. In an embodiment, a cool down calculation is combined with automatic frequency control to provide stable energy and dose per pulse even upon restarting of pulsing after an "off period of indeterminate duration.

IPC Classes  ?

• H05H 9/00 - Linear accelerators

Abstract

A linac-based X-ray system for cargo scanning and imaging applications uses linac design, RF power control, beam current control, and beam current pulse duration control to provide stable sequences of interleaved pulses having different energy levels, for example alternating 4 MeV and 6 MeV pulses or other energies where the difference in levels is at least approximately 1 MeV and less than approximately 5 MeV. The pulse repetition rate can be 100-400 pulses per second or more. In an embodiment, a cool down calculation is combined with automatic frequency control to provide stable energy and dose per pulse even upon restarting of pulsing after an “off” period of indeterminate duration.

IPC Classes  ?

• H05H 7/02 - Circuits or systems for supplying or feeding radio-frequency energy
• H05H 9/04 - Standing-wave linear accelerators
• G01V 5/00 - Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity