Balloon Applicator Beam Hardening for Intraoperative Radiation
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Solution Overview
Problem
Miniature X-ray sources for intraoperative radiation therapy face challenges with beam hardening due to equipment dimensions and sterility concerns, requiring effective beam hardening solutions that can be easily sterilized and positioned within the body.
Innovation Solution
A balloon applicator system with a beam hardening compound, capable of hardening x-ray beams in three dimensions, is integrated into an intraoperative radiation therapy system, allowing for precise beam direction and sterility maintenance through interchangeable balloon applicators with different beam hardening compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a beam hardening compound is positioned within the body of the patient during IORT, then beam hardening effectiveness is improved, but sterility maintenance and equipment replacement become more challenging
Solution Approach 1:
The beam hardening system is segmented into multiple components: a reusable treatment head containing the X-ray source and beam hardening compound, and a disposable balloon applicator. This segmentation allows the critical beam hardening function to be maintained while enabling easy replacement of the sterile balloon applicator after each procedure.
Solution Approach 2:
The balloon applicator acts as an intermediary between the treatment head and the patient tissue. It can be easily inserted and removed through small incisions, maintaining sterility while delivering the beam hardening effect through its integration with the treatment head.
2Measurement precision
If equipment dimensions are minimized for IORT, then precision and tissue exposure are improved, but beam hardening capability is compromised
Solution Approach 1:
The beam hardening compound is nested within the balloon applicator structure, which itself is positioned within the treatment head. This nested arrangement allows beam hardening functionality to be integrated into a compact, minimally invasive system that maintains precision while providing the necessary radiation modification.
Solution Approach 2:
The system uses composite construction combining the balloon applicator material with beam hardening compound (such as aluminum, copper, or iron filters). This composite approach enables beam hardening functionality within a compact, minimally invasive device that maintains radiation delivery precision.
3Reliability
If beam hardening is implemented in IORT, then radiation quality is improved, but equipment complexity and sterility requirements increase
Solution Approach 1:
The balloon applicator is designed as a disposable, single-use component that is sterilized and discarded after each procedure. This eliminates the need for complex sterilization processes for the entire system, reducing equipment complexity while maintaining radiation quality through the integrated beam hardening compound.
Solution Approach 2:
The treatment head is designed as a universal, reusable component that can be used with different balloon applicators and for different treatment scenarios. The beam hardening compound is integrated into the treatment head, allowing it to serve multiple functions: X-ray generation, beam hardening, and compatibility with various balloon applicators, thereby reducing overall system 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
The system provides effective beam hardening in three dimensions, minimizing exposure to healthy tissues and enabling precise radiation delivery, while ensuring sterility and ease of replacement, thus enhancing the precision and safety of intraoperative radiation therapy.
Implementation Method 1
Beam hardening is the process of exposing an x-ray beam comprised of polychromatic energies through an object to achieve selective attenuation of lower energy photons
Implementation Method 2
An inflatable balloon contactor having an outer surface
Data Source
AI summary
A balloon applicator for an intraoperative radiation therapy system includes an x-ray beam shaping component for emitting x-rays in a plurality of possible directions in three dimensions. The balloon applicator includes connecting structure for connecting to the intraoperative radiation therapy system and an inflatable balloon contactor having an outer surface. The balloon applicator has a beam hardening system including a beam hardening compound disposed between the x-ray beam shaping component and the outer surface of the balloon. The beam hardening system is capable of hardening the beam in beam directions in three dimensions. An intraoperative radiation therapy system and a method for conducting intraoperative radiation therapy are also disclosed.