Particle beam therapy system, ridge filter, and method of making ridge filter
US9899112B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 21, 2017 |
| Grant date | Feb 20, 2018 |
| Priority date | — |
| Expiry date | Feb 21, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05H2007/004
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A structure configuring a ridge filter has line symmetry about a line vertical to a depth direction passing the center of the structure. A small structure obtained in such a way that the structure is divided by this line has a bilaterally asymmetric shape about a center line in an iterative direction, and has a point symmetric shape about an intersection between the center line in the iterative direction and the center line in the depth direction. Thicknesses in the iterative direction of an uppermost stream surface and a lowermost stream surface in the depth direction are equal to each other. The structure is configured so that a thick portion in the iterative direction of the uppermost stream surface and the lowermost stream surface is not present in the depth direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.