Waddle

Overview

Waddle is a proposed independent verification approach for boron neutron capture therapy treatment plans. Its purpose is to evaluate relevant dose quantities across a continuous set of plausible capture-agent distributions and produce certified bounds on the result.

The project addresses a quality-assurance question created by an essential feature of BNCT: treatment effectiveness depends in part on where the boron-containing capture agent is distributed, but that distribution cannot be known exactly throughout the patient.

The problem

BNCT aims to concentrate a neutron-capture agent in tumor tissue and then irradiate the treatment region with neutrons. Capture reactions produce high-linear-energy-transfer particles over a short range, making the spatial distribution of the agent central to dose estimation.

A treatment plan therefore rests on uncertain biological inputs. One way to explore uncertainty is to evaluate a finite collection of sampled scenarios. Sampling can be useful, but a finite set of points does not by itself establish what occurs everywhere inside a continuous range of admissible distributions.

The quality-assurance problem is to determine whether clinically relevant quantities remain within acceptable bounds for every distribution allowed by a stated uncertainty model—not only for scenarios that happened to be sampled.

Proposed approach

Waddle represents uncertainty in the capture-agent distribution as an admissible set rather than as a single nominal input. The verification process then seeks lower and upper bounds for specified dose quantities over the full set.

Conceptually, the workflow has three parts: define the permitted uncertainty, propagate that uncertainty through the relevant dose calculation, and produce conservative bounds together with evidence supporting the result. The intended role is supplementary and independent: it would check a plan rather than replace the treatment-planning system that generated it.

1. Declare the uncertainty model.Specify the continuous range of capture-agent distributions considered plausible for the verification.
2. Compute response bounds.Establish conservative lower and upper bounds for the quantities selected for review.
3. Produce a checkable result.Return the bounds and supporting information in a form suitable for independent examination.

Potential significance

If the approach can be developed and validated, it could provide a more rigorous layer of quality assurance for BNCT planning under biological uncertainty. A dependable independent check may help researchers and clinical teams understand when a plan remains acceptable across a defined range of plausible conditions.

The broader potential is practical as well as technical. Quality-assurance burden can influence confidence, workflow complexity, and cost. Waddle is intended to investigate whether stronger verification can be made sufficiently clear and usable to support the field’s continued development.

Current status

Waddle is a patent-pending, early-stage research program. The present work defines the verification concept and its technical basis. Further development would require implementation, testing on representative planning problems, comparison with established methods, and collaboration with specialists in BNCT physics, dosimetry, treatment planning, and clinical quality assurance.

Nothing on this page should be interpreted as a claim of clinical validation, regulatory approval, or demonstrated improvement in patient outcomes.

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