摘要:
A beam extraction process (interruption and restart) is appropriately performed when a failure occurs during irradiation of a spot group. A charged particle irradiation system includes a synchrotron 12 and a scanning irradiation unit 15 that scans an ion beam extracted from the synchrotron over a subject. The extraction of the ion beam from the synchrotron is stopped on the basis of a beam extraction stop command. Scanning magnets 5A and 5B are controlled to change a point (spot) to be irradiated with the ion beam, while the extraction of the ion beam is stopped. The extraction of the ion beam from the synchrotron is restarted after the change of the spot to be irradiated. When a relatively minor failure in which continuous irradiation would be possible occurs during irradiation of a certain spot with the beam, the extraction of the beam is not immediately stopped.
摘要:
A take-up machine is provided. Each of upper and lower conveying devices has an endless rotating body and a plurality of take-up pads provided on the surface of the endless rotating body. The take-up machine is configured to pinch a top face and a bottom face of a resin-molded article with the take-up pads of the upper and lower conveying devices to take up the resin-molded article. The take-up machine is installed along an extrusion line of a resin extruder. In a lateral direction orthogonal to an extrusion line, a length of each of the take-up pads is multiple times a length of the resin-molded article to be taken up. Each of the take-up pads has a plurality of supporting potions which are arranged in the lateral direction and capable of supporting resin-molded articles with different shapes. The upper and lower conveying devices are movable in the lateral direction so as to make one of the supporting portions coincide with the extrusion line.
摘要:
This invention provides a retainer assembling apparatus which assembles a retainer to a valve stem via a cotter which engage with an engaging groove formed on the valve stem. The cotter comprises a pair of cotter segments. The apparatus includes a cylindrical body, a holding portion which holds the retainer contacting a lower end of the cylindrical body, a push-up shaft which pushes up the pair of cotter segments into the cylindrical body, and an axial body which is arranged in the cylindrical body to be coaxial with the push-up shaft and to be coaxially movable. The cylindrical body includes a tapered inner circumferential portion on an inner circumferential wall lower portion thereof.
摘要:
A nonvolatile memory stores therein a plurality of partitioned translation tables which are created by partitioning a logical-to-physical address translation table in a page unit. A RAM stores therein a logical-to-physical address translation table cache for storing at least the one or more partitioned translation tables, a translation-table management table for managing the partitioned translation tables, and a cache management table for managing the logical-to-physical address translation table cache. The translation-table management table includes a cache presence-or-absence flag and a cache entry number, the cache presence-or-absence flag being used for indicating that the partitioned translation tables are stored into the logical-to-physical address translation table cache, the cache entry number being used for indicating storage destinations of the partitioned translation tables in the logical-to-physical address translation table cache. Reading/writing processings of information in the logical-to-physical address translation table between the nonvolatile memory and the RAM are performed in the page unit.
摘要:
A particle beam treatment apparatus and an irradiation nozzle apparatus achieve a beam with a small diameter by a beam scanning irradiation method, and ensure a space for installation of a beam transport chamber in the irradiation nozzle apparatus. An X-ray tube is located outside the scanning type irradiation nozzle apparatus that includes scanning magnets, while an X-ray tube is located in an irradiation nozzle apparatus in a conventional structure. An X-ray detector is located inside the irradiation nozzle apparatus. The thickness of the X-ray detector in the direction of a beam axis is smaller and the structure thereof is simpler than that of the X-ray tube. This makes it possible to ensure the space for installation of the beam transport chamber in the irradiation nozzle apparatus and to increase the length of the beam transport chamber that is included in the irradiation nozzle apparatus.
摘要:
A beam extraction process (interruption and restart) is appropriately performed when a failure occurs during irradiation of a spot group. A charged particle irradiation system includes a synchrotron 12 and a scanning irradiation unit 15 that scans an ion beam extracted from the synchrotron over a subject. The extraction of the ion beam from the synchrotron is stopped on the basis of a beam extraction stop command. Scanning magnets 5A and 5B are controlled to change a point (spot) to be irradiated with the ion beam, while the extraction of the ion beam is stopped. The extraction of the ion beam from the synchrotron is restarted after the change of the spot to be irradiated. When a relatively minor failure in which continuous irradiation would be possible occurs during irradiation of a certain spot with the beam, the extraction of the beam is not immediately stopped.
摘要:
A charged particle beam irradiation system and a charged particle beam extraction method which can prevent erroneous irradiation of a charged particle beam in the direction of advance of the charged particle beam. The system and method are featured in stopping supply of an ion beam to one or more of a plurality of angle zones in each of which a target dose is attained, the angle zones being formed by dividing an RMW in a rotating direction thereof, and in allowing the supply of the ion beam to one or more other angle zones in each of which a target dose is not yet attained. The invention can easily adjust beam doses at various positions in an affected part of the patient body in the direction of advance of the ion beam, and can greatly reduce the probability of erroneous irradiation that the beam dose becomes excessive or deficient at the various positions within the affected part of the patient body in the direction of advance of the ion beam.
摘要:
Particle beam irradiation equipment and a method of adjusting irradiation nozzle, which can ensure a long range and high dose uniformity at any field size are provided. The particle beam irradiation equipment comprises charged particle beam generation equipment and an irradiation nozzle for irradiating a charged particle beam extracted from the charged particle beam generation equipment to an irradiation target. The irradiation nozzle comprises a first scatterer device including a first scatterer for spreading out the charged particle beam into a Gaussian-like distribution, and multiple stages of second scatterer devices including second scatterers for producing a uniform intensity distribution of the charged particle beam having been spread out into a Gaussian-like distribution by the first scatterer. For forming irradiation fields having sizes different from each other, the second scatterer devices are disposed downstream of the first scatterer device in the direction of travel of the charged particle beam at the spacing depending on the difference in the field size.
摘要:
A particle therapy system capable of measuring energy of a charged particle beam even during irradiation of the charged particle beam is provided. A beam delivery (irradiation) system comprises a block collimator constituted by a pair of collimator members, and an energy detector mounted to one of the collimator members to be disposed on the upstream side thereof. When the pair of collimator members are moved in directions away from each other, a beam passage is formed between them. The energy detector constitutes an energy measuring device together with a signal processing unit. A part of the ion beam having reached the interior of the irradiation nozzle is irradiated to a patient through the beam passage. When a part of the remaining ion beam enters the energy detector, electric charges generate in the energy detector. The signal processing unit determines energy of the ion beam based on a position within the energy detector at which electric charges have generated in maximum amount.