Miniature X-ray Source Rastering for Tissue Surface Therapy
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Solution Overview
Problem
Traditional radiation therapy methods for tissue surfaces are limited by the need for permanent placement of low-energy radionuclide seeds, high capital expenses for facilities, and inconvenience for rural patients due to the requirement of heavily shielded rooms and continuous radiation emissions from radionuclides, leading to inefficiencies and accessibility issues.
Innovation Solution
The use of computer-driven mechanical rastering of a miniature x-ray radiation source between 20 and 100 kV, allowing for precise delivery of radiotherapy according to a treatment plan, with the ability to control penetration depth and dose intensity, and the option to treat in various settings without the need for continuous emissions or permanent seed placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low energy radionuclide seeds are positioned in a pattern on a mesh substrate for surface treatment, then radiation treatment can be delivered to the tissue surface, but the seeds must be left in the patient permanently due to low energy levels and prolonged treatment times
Solution Approach 1:
The patent changes the energy parameter from low energy radionuclide seeds to higher energy x-ray sources (50-150 kV), enabling shorter treatment times and eliminating the need for permanent seed placement while maintaining treatment effectiveness
Solution Approach 2:
The patent replaces the mechanical implantation system (radionuclide seeds on mesh substrate) with an electronic x-ray generation system that delivers radiation externally, eliminating the need for permanent foreign body implantation
2Volume of moving object
If large, high-energy external radiation beams in the megavolt range are used for surface treatment, then radiation can be delivered to deep tissues, but normal tissue is exposed to unnecessary levels of radiation
Solution Approach 1:
The patent applies local quality by using lower energy x-rays (50-150 kV) that are specifically suited for surface and shallow tissue treatment, concentrating the radiation effect where needed while sparing deeper normal tissues from unnecessary exposure
Solution Approach 2:
The patent employs dynamic scanning of the x-ray source across the treatment field, allowing precise control of radiation delivery to match the treatment plan and minimize exposure to normal tissues
3Volume of moving object
If radionuclide sources with high-energy components are used for surface therapy, then deep tissue penetration is achieved, but heavily shielded rooms and automated handling are required due to continuous emission
Solution Approach 1:
The patent changes the radiation source parameters from continuous-emitting radionuclides to controllable x-ray sources that can be activated only during treatment, eliminating the need for permanent shielding and automated handling systems
Solution Approach 2:
The patent implements periodic action by using x-ray sources that emit radiation only during the brief treatment period when activated, rather than continuous emission from radionuclides, allowing treatment in ordinary rooms without heavy shielding
4Ease of operation
If fixed spacing source guides are used in surface applicators, then source manipulation is simplified, but non-uniformity in delivered radiation dose occurs
Solution Approach 1:
The patent employs dynamic scanning motion of the x-ray source across the treatment field, allowing flexible positioning and dwell time control at each location to achieve uniform dose distribution while maintaining ease of operation through automated control
Solution Approach 2:
The patent implements treatment planning systems that calculate and control the scanning path and dwell times to ensure uniform dose delivery, using feedback from dosimetric measurements to optimize treatment parameters
5Stability of the object's composition
If rigid applicator structures are used for surface treatment, then source positioning is stable, but adequate conformance to irregular tissue surfaces is limited
Solution Approach 1:
The patent uses flexible or conformable applicator structures that can adapt to irregular tissue surfaces while maintaining stable source positioning through rigid support frameworks or active positioning systems
Solution Approach 2:
The patent employs dynamic scanning and positioning systems that can adjust the source position in real-time to maintain optimal distance from irregular tissue surfaces, combining stability with adaptability
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 enables more efficient and cost-effective radiotherapy with reduced exposure to normal tissues, increased accessibility for a broader population, and improved treatment planning precision, allowing for faster treatment times and greater flexibility in treatment settings.
Implementation Method 1
computer-driven mechanical rastering of a miniature x-ray radiation source between 20 and 100 kV
Implementation Method 2
computer-driven mechanical rastering of a miniature x-ray radiation source
Implementation Method 3
radiation intensity diminishes exponentially with either attenuation resulting from materials placed between the radiation source and target, or by distance from the source
Data Source
AI summary
A device, system and method for administering radiation therapy to a tissue surface of a patient utilizes an applicator capable of controlled movement and repositioning over a selected area of tissue, under the control of a computer or controller. A servo-controlled manipulator can effect a raster scan of the desired area, such as an area of the skin, and this can be in any desired pattern such as serpentine, spiral, parallel but unidirectional, or irregular patterns. Preferably a third direction of control is included, i.e. a depth direction, with an appropriate form of depth sensor, a signal from which can be used to adjust the radiation source so that radiation of the tissue surface is consistent over varied contoured.