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Automatic Beam Modelling System Licensed

Techna and UHN’s Technology Development and Commercialization office are pleased to announce that UHN has licensed a new technology for the commissioning of linear accelerator beam models for treatment planning systems to RaySearch Laboratories AB (publ), a global leader in radiation therapy treatment planning systems.

Linear accelerators (linacs) are devices that generate beams of radiation for the treatment of cancer. The radiation therapy process for cancer patients involves the acquisition of a 3-dimensional representation of the patient’s anatomy (usually a CT dataset), the design of a treatment plan and the delivery of this plan over the course of multiple days of treatment. Specialized treatment planning software is used to design the treatment plans for radiation therapy patients, which maximizes tumor dose coverage while maintaining dose to surrounding tissue within an acceptable level. The treatment planning system uses a virtual model of the linear accelerator to compute the dose in the 3-dimensional representation of the patient. A medical physicist needs highly detailed information on precisely how a linac delivers radiation in the real world when creating and delivering a treatment plan, to ensure that the radiation actually delivered is as close as possible to the treatment plan designed with the treatment planning system. Collecting the information needed to build an accurate beam model for the treatment planning system is one of the main challenges when installing and commissioning a new linac system.

Creating and optimizing a beam model during the treatment planning system commissioning can be a time consuming task, requiring multiple iterations. The quality of the beam model created in commissioning depends on the physicist’s ability to manage multiple parameters and assess their effect on the output. Techna and Princess Margaret Radiation Medicine Program scientists Drs. Daniel Letourneau, David Jaffray, and Michael Sharpe developed the Automatic Beam Modelling System (ABMOS) to relieve staff of this time-consuming task, and help standardize the modelling process. ABMOS automatically adjusts the beam model parameters in an iterative fashion to maximize the agreement between measured and calculated 2D dose maps.

“The ABMOS system not only can help shorten the time required to commission a new beam model for linacs but can also potentially lead to improved radiation therapy treatment quality as it helps standardize the beam modeling process in the treatment planning system,” says Dr. Letourneau, co-inventor of ABMOS. “Licensing to RaySearch will help bring standardized beam models to linacs across the globe.”