A method to reduce local hot/cold spots in dmpo-based imrt planning
AssigneeKoninklijke Philips N.V.
InventorsVaitheeswaran RANGANATHAN, Gipson JOE ANTO, Prashant KUMAR
Life of this patent
Estimating the term…
Abstract
A method and related system to adjust an existing treatment plan. A second optimization is run based on a dual objective function system that includes a first objective function used for the optimization in respect of the existing plan and a second, extended objective function that includes the said first objective function as a functional component.
Claims11
A method of adjusting a first specification of a dose distribution in an object to be exposed to radiation by means of a radiation dispenser (LINAC), said specification computed based on a first objective function, the objective function defining a dose requirement for at least one respective location in an object in terms of a machine setting for said radiation dispenser, the method comprising the steps of:
- based on the first specification, identifying at least one location for which a respective dose requirement as per the first objective function is not met relative to a threshold;
- receiving a new dose requirement for the identified at least one location;
- computing a second specification based on two objective functions including the first objective function and a second, extended objective function, formed from the first objective function, wherein the extended objective function includes at least one of the dose requirements as per the first objective function in addition to the new dose requirement.
An apparatus (TPA) for adjusting a first specification of a dose distribution in an object to be exposed to radiation by means of a radiation dispenser, said specification computed based on a first objective function, the objective function defining a dose requirement for at least one respective location in an object in terms of a machine setting for said radiation dispenser, the method comprising the steps of:
- an input port (IN) configured to receive the first specification;
- a location identifier (LI) module configured to identify, based on the first specification, at least one location for which a respective dose requirement as per the first objective function is not met relative to a threshold;
- a dose input port (D-IN) configured to receive a new dose requirement for the identified at least one location;
- a plan re-adjuster module (PRM) configured to compute a second specification based on two objective functions including the first objective function and a second, an extended objective function, formed from the first objective function, wherein the extended objective functions includes at least one of the dose requirements as per the first objective function in addition to the new dose requirement.
Dependencies are inferred from the claim text.