Radiation Therapy Bolus Hot Spot Reduction
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Solution Overview
Problem
Conventional radiation therapy bolus designs fail to effectively reduce hot spots generated by scattering from peaks in the outer surface of the bolus, leading to inhomogeneous dose distribution and potential treatment inefficiencies.
Innovation Solution
A method to identify local maxima on the outer surface of the digital bolus model associated with hot spots and modify the surrounding region to smooth the peaks, thereby reducing the intensity of hot spots through a refined digital bolus model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer surface of the bolus contains peaks to achieve dose modulation, then the dose conformity to the target volume is improved, but hot spots are generated due to scattering from the peaks
Solution Approach 1:
The patent applies local quality by identifying and modifying only the specific peak regions on the bolus outer surface that cause hot spots, while preserving other regions needed for dose conformity. The algorithm selectively smooths peaks based on their contribution to hot spot generation, maintaining dose modulation in non-problematic areas.
Solution Approach 2:
The patent changes the geometric parameters of the bolus outer surface by identifying peaks through curvature analysis and modifying their height or position. This parameter modification reduces scattering from peaks while maintaining the overall dose modulation function of the bolus.
2Object-generated harmful factors
If the bolus outer surface is smoothed to reduce hot spots, then hot spot intensity is reduced, but dose conformity to the target volume may deteriorate
Solution Approach 1:
The patent employs feedback by iteratively evaluating the dose distribution after peak modification, identifying remaining hot spots, and adjusting the bolus surface accordingly. The algorithm continuously monitors dose conformity metrics and adjusts peak smoothing to maintain target coverage while reducing hot spots.
Solution Approach 2:
The patent applies partial action by selectively smoothing only those peaks that contribute significantly to hot spot generation, rather than uniformly smoothing the entire bolus surface. This selective approach preserves dose conformity in regions where peaks are therapeutically beneficial.
3Object-generated harmful factors
If manual adjustment of bolus design is performed to reduce hot spots, then hot spot reduction can be achieved, but the design complexity and time required increase
Solution Approach 1:
The patent implements self-service through an automated algorithm that independently identifies peaks, evaluates their hot spot contribution, and modifies the bolus design without requiring manual intervention. The system performs dose calculation, peak identification, and geometric modification automatically, reducing design complexity.
Solution Approach 2:
The patent replaces manual mechanical adjustment of bolus design with an automated computational system. The algorithm uses dose calculation software and geometric modeling to automatically modify the bolus surface, substituting manual design processes with automated computational methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach significantly reduces hot spot intensity, improving dose conformity and homogeneity, ensuring more effective radiation therapy by addressing the root cause of hot spot generation, thereby enhancing treatment outcomes.
Implementation Method 1
hot spots generated by scattering from peaks in the outer surface of the bolus
Data Source
AI summary
Systems and methods are provided for designing and/or modifying a radiation therapy bolus for the reduction of hot spots. A digital bolus model may be modified based on the identification of a peak in the outer surface of the digital bolus model, where the peak satisfies search criteria associated with the generation of a hot spot through scattering from the peak. The digital bolus model is modified within a region surrounding the peak to smooth the peak and thereby reduce the intensity of the hot spot. The modified digital bolus model may be employed to fabricate a bolus for use in radiation therapy. The search criteria may be evaluated according to a proximity between a location measure associated with the peak and a location measure associated with the hot spot, optionally when the location measures are projected in a reference plane that resides perpendicular to the beam axis.