Strontium-90 Beta Source with Toroidal Shielding for Brachytherapy
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Solution Overview
Problem
Existing radiological sources used in brachytherapy and medical applications often emit isotropic radiation, exposing surrounding healthy tissues to unnecessary radiation, rather than concentrating the radiation on the diseased tissue.
Innovation Solution
A beta radiological source with increased radioactivity around its periphery and reduced radioactivity at its center, combined with a beta radiation collimator grid or toroidal shape to collimate the radiation, directing it more effectively to the target area while minimizing exposure to surrounding tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an isotropic radiation source is used, then the radiation is emitted uniformly in all directions, but this exposes surrounding healthy tissues to unnecessary radiation instead of concentrating it on the diseased tissue
Solution Approach 1:
The radiation source is designed with non-uniform radioactivity distribution, having increased radioactivity around the periphery and reduced radioactivity at the center. This local variation in radioactive concentration allows the source to emit more radiation toward the target tissue while emitting less toward surrounding healthy tissues, thereby resolving the contradiction between protecting healthy tissues and maintaining operational simplicity.
Solution Approach 2:
The radiation source employs a toroidal or annular shape with asymmetric radioactivity distribution rather than a symmetric isotropic source. This asymmetric design inherently directs more radiation toward the intended target while naturally reducing exposure to surrounding healthy tissues, eliminating the need for complex collimation systems and achieving both protection and operational ease.
2Object-affected harmful factors
If a collimated distribution of radiation is implemented, then radiation is directed at the tissues under treatment while reducing radiation to surrounding tissues, but this requires increased device complexity
Solution Approach 1:
Instead of using complex external collimation devices, the patent incorporates the collimation function directly into the radiation source itself through non-uniform radioactivity distribution. The source has increased radioactivity at the periphery and reduced radioactivity at the center, creating an inherent collimated distribution that directs radiation toward the target while protecting surrounding tissues, thereby achieving the desired effect without increasing overall device complexity.
Solution Approach 2:
The patent merges the radiation emission function with the collimation function into a single integrated source design. By combining the radioactive material distribution pattern with the geometric shape (toroidal or annular), the source simultaneously performs both radiation emission and directional control, eliminating the need for separate collimation components and reducing device complexity.
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
This configuration achieves a flat radiation profile, ensuring a constant absorbed dose rate throughout the target volume, reducing unnecessary exposure to healthy tissues and enhancing the effectiveness of treatments like those for wet age-related macular degeneration.
Implementation Method 1
A beta radiological source, typically containing strontium-90, wherein the radiological insert has increased radioactivity around its periphery and less radioactivity at its center
Implementation Method 2
providing an encapsulation with increased shielding in the center of the face from which the therapeutic radiation is emitted, thereby substantially attenuating the radiation emitted from the central portion of a source
Data Source
AI summary
The disclosure pertains to a strontium-90 sealed radiological or radioactive source, such as may be used with treatment of the eye or other medical or industrial processes. The sealed radiological source includes a toroidal shaped strontium radiological insert within an encapsulation. The encapsulation includes increased shielding in the center thereof.