Controlling delivery of radiotherapy
CA 2324446 A1 · Owner: Convery, David John · Inventors: Convery, David John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An algorithm to generate discrete beam intensity modulation by dynamic multileaf collimation (MLC) is described which incorporates constraints on minimum allowed leaf separations. MLC positioning information is derived simultaneously for all leaf pairs and backup diaphragms as they progress across the field and a feedback mechanism allows corrections to be applied to eliminate potential violations of minimum separation conditions and any underexposure in the inter-leaf-tongue-and-groove region as they are encountered. The resulting motion correctly delivers the intended modulation and is physically realisable. Results of the algorithm can also alternatively be interpreted as …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 19, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.