Intensity-Modulated Pixelated X-Ray Therapy for Precise Lesion Coverage
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Solution Overview
Problem
The fabrication of shielding templates for brachytherapy is time-consuming and imprecise, leading to incomplete treatment of targeted lesions and unnecessary exposure of surrounding healthy tissue due to subjective margin allowances and irregular lesion shapes.
Innovation Solution
An x-ray treatment system with a pixel source cell array and electron beam control system that generates precise, intensity-modulated x-ray photon beams by selecting and controlling individual pixel source cells based on a treatment plan, using a controller to determine direction and intensity of the electron beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a shielding template with cutout portion is used to define treatment area, then x-ray photons can be directed to targeted lesion, but the fabrication process is time-consuming and imprecise
Solution Approach 1:
The treatment system divides the treatment head into multiple independently controllable pixel source cells arranged in an array. Each pixel source cell can be individually activated or deactivated by the controller based on the treatment plan, eliminating the need for a single monolithic shielding template. This segmentation allows precise definition of treatment areas through digital control rather than physical fabrication.
Solution Approach 2:
The patent replaces the mechanical shielding template system with a digitally controlled pixel source cell array. Instead of physically fabricating and positioning a template with cutout portions, the system uses electronic control to selectively activate pixel source cells, substituting mechanical template-based collimation with electronic pixel-level control.
2Reliability
If treatment margin is added beyond lesion contours to ensure complete treatment, then all targeted cancer cells are eliminated, but surrounding healthy tissue is unnecessarily exposed
Solution Approach 1:
Each pixel source cell in the array can be independently controlled to deliver x-ray photons with specific intensity levels. The controller adjusts the intensity of individual pixels based on the treatment plan, allowing different parts of the treatment area to receive different doses. This local quality control enables precise dose painting while minimizing exposure to surrounding healthy tissue.
Solution Approach 2:
The system dynamically adjusts the intensity of each pixel source cell during treatment based on real-time control signals from the controller. This dynamic control allows the treatment system to adapt to the irregular surface and subsurface shapes of the lesion, delivering optimized radiation doses to different regions without requiring a fixed treatment margin that would expose healthy tissue.
3Measurement precision
If shielding template is precisely placed and attached prior to treatment, then x-ray photons are directed accurately to treatment area, but any movement of template compromises treatment precision
Solution Approach 1:
The patent replaces the mechanical template positioning system with a digitally controlled pixel source cell array. The controller selectively activates specific pixels based on the treatment plan, eliminating the need for physical template placement and attachment. This substitution removes the vulnerability to template movement while maintaining precise treatment area definition through electronic control.
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
Achieves high-precision treatment of lesions with minimal exposure to healthy tissue by individually controlling x-ray photon beams, eliminating the need for shielding templates and ensuring complete lesion coverage.
Implementation Method 1
an electron beam generator configured to generate an electron beam
Implementation Method 2
a target element that, when impacted by the electron beam, generates x-ray photon radiation
Implementation Method 3
The side walls include an x-ray absorptive material
Data Source
AI summary
An x-ray treatment system includes an electron beam generator configured to generate an electron beam and an x-ray treatment head comprising an array of pixel source cells including side walls defining an x-ray transmissive interior. The side walls include an x-ray absorptive material. A target element is positioned to, when impacted by the electron beam, generate x-ray photon radiation within the x-ray transmissive pixel source cell interior. An electron beam control system includes a controller configured to control responsive to a treatment plan at least one of the direction and intensity of the electron beam to a particular one of the pixel source cells, and then responsive to the treatment plan to control at least one of the direction and intensity of the electron beam to at least one additional pixel source cell. A method of treating a patient with x-ray photon radiation is also disclosed.