Cystic Applicator Scattering Foil Thickness Optimization
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Solution Overview
Problem
Current electron beam irradiation technologies cannot achieve non-planar dose distribution for spherical cystic and tubular tumors in radiotherapy, limiting their application in intraoperative and external beam radiotherapy.
Innovation Solution
A cystic applicator with a hollow structure, a scattering foil, and a modulator that converts electron beams into X-rays and modulates radiation intensity to achieve uniform dose distribution, optimized in thickness to ensure a larger scattering angle and desired intensity distribution for effective radiotherapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a scattering foil is added to convert electron beam into X-rays and scatter radiation, then the applicability to cystic tumors is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated applicator device: the scattering foil, modulator, and housing are merged into one unified structure that can be placed directly into cystic tumors. This integration resolves the contradiction by achieving versatile cystic tumor treatment capability while managing device complexity through functional consolidation rather than separate components.
Solution Approach 2:
The applicator is designed with multi-functionality to handle various cystic tumor types (spherical, tubular, irregular shapes) using the same basic device structure. The scattering foil converts electron beams to X-rays, while the modulator adjusts radiation distribution, creating a universal solution for different cystic geometries without requiring multiple specialized devices.
2Shape
If the scattering foil thickness is increased to achieve larger scattering angle, then the scattering angle is improved, but the intensity of mixed radiation decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the scattering foil thickness to a specific range (0.5-2.0 mm) that balances scattering angle and radiation intensity. This parameter optimization resolves the contradiction by finding the optimal thickness value that provides sufficient scattering for cystic tumor coverage while maintaining adequate radiation intensity for effective treatment.
Solution Approach 2:
The modulator is designed with spatially varying thickness or density to compensate for intensity variations caused by the scattering foil. Different regions of the modulator have different properties to locally adjust radiation intensity, ensuring uniform dose distribution while maintaining the scattering foil's optimal thickness for scattering angle.
3Stability of the object's composition
If the modulator thickness is optimized to achieve uniform intensity distribution, then the dose distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
The modulator employs local quality variations in its structure (different thicknesses or densities at different positions) to achieve uniform radiation intensity distribution across the cystic tumor. This localized optimization resolves the contradiction by creating uniform dose distribution through spatially varying modulator properties rather than requiring complex active control systems.
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 cystic applicator expands the application of electron beam radiotherapy by converting a portion of the electron beam into X-rays and modulating the intensity of mixed radiation, resulting in a uniform dose distribution for cystic tumors, including spherical and tubular shapes, thereby enhancing treatment efficacy.
Implementation Method 1
a scattering foil disposed at the opening of the hollow cystic structure and configured to receive first radiation and convert a portion of the first radiation into second radiation while scattering the first radiation in a large spread angle
Implementation Method 2
convert a portion of the first radiation into second radiation while scattering the first radiation in a large spread angle
Implementation Method 3
a modulator disposed inside the hollow cystic structure and configured to modulate an intensity of mixed radiation including the first radiation and the second radiation
Data Source
AI summary
The present disclosure generally relates to an applicator for radiotherapy and a method for determining a thickness of a scattering foil and modulator therein. According to one embodiment, an applicator for radiotherapy may comprise a housing having a hollow structure with an opening, a scattering foil disposed at an opening of the hollow structure and configured to receive a first radiation and convert a portion of the first radiation into a second radiation while scattering the first radiation, and a modulator disposed inside the hollow structure and configured to modulate an intensity of mixed radiation including the first radiation and the second radiation.