Real-time Adaptive Dose Computation in Radiation Therapy
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Solution Overview
Problem
Current radiation therapy techniques fail to monitor and compute the actual dose delivered during treatment, leading to potential overdosing of healthy tissues and underdosing of the target area due to patient tissue movement during treatment delivery, as no volumetric data is tracked in real-time.
Innovation Solution
A radiation therapy system incorporating an ultrasound imaging unit, registration unit, and real-time dose computation engine that generates baseline and real-time ultrasound images, deformably registers planning images with real-time US images, maps tissue radiation absorptive properties, and computes the real-time radiation dose delivered to tissues based on 3D US images, allowing for voxel-by-voxel dose measurement and real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time ultrasound imaging and dose computation are implemented, then dose accuracy is improved, but device complexity increases
Solution Approach 1:
The system is divided into distinct functional modules: ultrasound imaging unit for real-time volumetric data acquisition, registration unit for image alignment, and dose computation engine for dose calculation. This segmentation allows each module to specialize in a specific task, improving overall dose accuracy while making the complex system more manageable and maintainable through modular architecture.
Solution Approach 2:
A registration unit acts as an intermediary between the ultrasound imaging unit and the dose computation engine. This intermediary component aligns the real-time ultrasound volumetric data with the treatment plan data, enabling accurate dose computation without requiring direct complex interactions between the imaging and computation systems, thus reducing overall system complexity.
2Measurement precision
If real-time volumetric data tracking is implemented, then dose computation accuracy is improved, but loss of time is reduced (real-time processing)
Solution Approach 1:
The ultrasound imaging unit continuously acquires volumetric data during radiation therapy treatment delivery, and the dose computation engine continuously computes dose based on this real-time data. This continuous processing eliminates gaps between data acquisition and dose calculation, ensuring that the most current anatomical information is always used for dose computation, thereby improving accuracy without time loss.
Solution Approach 2:
The system performs preliminary registration of the ultrasound volumetric data with the treatment plan data before dose computation begins. This preliminary alignment ensures that when real-time dose computation starts, the data is already prepared and aligned, eliminating the need for time-consuming processing during actual dose calculation and enabling real-time accuracy.
3Manufacturing precision
If deformable registration and tissue property mapping are implemented, then dose delivery precision is improved, but device complexity increases
Solution Approach 1:
The deformable registration process computes local deformation fields that capture tissue displacement and distortion specifically in the regions affected by patient motion. The tissue property mapping then applies radiation absorptive properties from the treatment plan to the corresponding deformed ultrasound data. This localized approach improves dose delivery precision by accurately accounting for local anatomical changes without requiring complex global processing of the entire dataset.
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
Enables real-time radiation dose computation and adjustment during treatment, ensuring accurate delivery of radiation doses to the target area while minimizing exposure to surrounding tissues and Organs At Risk, by tracking motion and adjusting beam parameters accordingly.
Implementation Method 1
The ultrasound (US) imaging unit generates a baseline and real-time US images of a subject body region
Implementation Method 2
The registration unit deformably registers a planning image and the baseline ultra-sound (US) image, and maps radiation absorptive properties of tissue in the planning image to the baseline US image
Implementation Method 3
The real-time dose computation engine computes a real-time radiation dose delivered to the tissues based on the mapped tissue radiation absorptive properties and the real-time 3D US images
Data Source
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AI summary
A radiation therapy system (1) includes an ultrasound (US) imaging unit (2), a registration unit (30), an US motion unit (44), and a real-time dose computation engine (46). The ultrasound (US) imaging unit (2) generates a baseline and real-time US images (3) of a subject body (4) region including a target and one or more Organs At Risk (OARs). The registration unit (30) deformably registers a planning image (32) and the baseline US image (36), and maps (66) radiation absorptive properties of tissue in the planning image (32) to the baseline US image (36). The US motion unit (44) measures motion of the target volume and OARs during radiation therapy treatment based on the real-time US images. The real-time dose computation engine (46) computes a real-time radiation dose delivered to the tissues based on the tissue radiation absorptive properties mapped from the baseline or planning images to the real-time 3D US images (3).