Carbon Nanotube X-Ray Source Array for Microbeam Radiotherapy
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Solution Overview
Problem
Current radiotherapy systems are ineffective for treating radioresistant and late-stage cancers due to excessive collateral damage to normal tissues, particularly in pediatric patients and those with central nervous system cancers, as they cannot deliver the high dose rate and spatially discrete radiation required for effective tumor eradication without harming surrounding tissues.
Innovation Solution
A compact, non-synchrotron source microbeam radiotherapy system utilizing a distributed x-ray source array composed of carbon-nanotube field emission x-ray sources, which generates multiple narrow x-ray microbeams and achieves high dose rates by distributing x-ray power over a larger area, reducing heat load and enabling precise targeting of tumors while minimizing exposure to normal tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional radiotherapy systems are used to treat tumors, then treatment can be provided, but excessive collateral damage is caused to normal tissues
Solution Approach 1:
The patent divides the radiation beam into multiple discrete microbeams (e.g., 10-100 separate beams) that are spatially separated and directed at the tumor. This segmentation allows the radiation to be delivered in a distributed manner across the tumor volume while sparing surrounding normal tissues, directly resolving the contradiction between effective tumor treatment and collateral damage.
Solution Approach 2:
The patent implements local quality by creating spatially discrete microbeams with specific characteristics (width, separation, intensity) that are optimized for different regions. The microbeams are positioned to irradiate tumor areas with higher dose while avoiding normal tissues, allowing different spatial regions to receive different radiation qualities tailored to their specific needs.
2Productivity
If high dose rate radiation is delivered to eradicate tumors quickly, then treatment time is reduced, but normal tissue damage increases
Solution Approach 1:
By segmenting the total radiation dose into multiple discrete microbeams delivered simultaneously, the system achieves high effective dose rate at the tumor while the temporal distribution of exposure to normal tissues is reduced. Each microbeam delivers a portion of the total dose, and the spatial separation ensures normal tissues receive minimal cumulative exposure even at high instantaneous dose rates.
3Power
If conventional x-ray tubes are used, then equipment is available, but the required ultrahigh dose rate cannot be achieved
Solution Approach 1:
The patent employs multiple separate x-ray tubes (e.g., 10-100 tubes) arranged in an array, where each tube contributes to the total radiation output. This segmentation of the x-ray source array allows the system to achieve ultrahigh effective dose rates by combining the output of multiple tubes, while each individual tube operates at manageable power levels that are commercially available.
Solution Approach 2:
The patent merges the output of multiple conventional x-ray tubes to achieve the required ultrahigh dose rate. By combining the radiation from 10-100 separate tubes, the system reaches the necessary power levels for effective MRT while using readily available commercial x-ray tube technology rather than requiring single-source ultrahigh power devices.
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 approach allows for the effective eradication of tumors with minimal collateral damage by delivering high dose rates and spatially discrete radiation, potentially improving treatment outcomes for previously intractable cancer cases and enabling wider clinical and research applications.
Implementation Method 1
carbon-nanotube field emission x-ray sources
Implementation Method 2
generating a plurality of x-ray microbeams from the plurality of carbon-nanotube field emission x-ray sources
Data Source
AI summary
The present subject matter relates to compact, non-synchrotron microbeam radiation therapy (MRT) systems and methods for cancer research and treatment based on a carbon nanotube distributed x-ray source array technology. The systems and methods can deliver microscopically discrete x-ray radiation at peak dose rate of 10 Gy per second or higher. The x-ray radiation can be provided by a spatially distributed x-ray source array. The technology can be used, for example and without limitation, for human cancer treatment, for intra-operative radiation therapy, and for pre-clinical cancer research on animal cancer models.