Radiation Therapy Quality Assurance via Online Imaging and Deformation Mapping
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Solution Overview
Problem
Current radiation therapy techniques face uncertainties due to patient setup variations, physiological changes, and motion, which can lead to inaccuracies in delivering the intended radiation dose, and existing quality assurance methods often fail to detect errors in treatment planning caused by incorrect input data.
Innovation Solution
Implementing a system-level quality assurance method that uses image-guidance, on-line imaging, and deformation mapping to verify the delivery of radiation therapy treatment plans, ensuring that the actual dose received by the patient matches the planned dose by monitoring quality assurance criteria and recalculating the radiation dose based on real-time patient data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard radiation therapy delivery is used without adaptive verification, then treatment delivery is faster and simpler, but the accuracy of dose delivery is reduced due to setup variations, physiological changes, and motion
Solution Approach 1:
The patent implements a feedback-based quality assurance system that monitors treatment delivery in real-time and compares actual delivery against the treatment plan. The system uses online imaging to track patient anatomy and deformation mapping to detect deviations from the planned dose delivery, providing continuous feedback to ensure accuracy despite setup variations and physiological changes.
Solution Approach 2:
The system performs preliminary quality assurance checks by acquiring online images and generating deformation maps before and during treatment delivery. This allows potential errors in dose delivery to be detected and corrected before they affect the actual treatment outcome, preventing rather than just detecting problems.
2Reliability
If online imaging and deformation mapping are implemented for quality assurance, then treatment delivery accuracy is improved, but treatment time and resource requirements increase
Solution Approach 1:
The quality assurance system operates continuously throughout the treatment delivery process rather than requiring separate pre-treatment and post-treatment verification steps. Online imaging and deformation mapping are performed concurrently with dose delivery, eliminating idle time and ensuring continuous monitoring without interrupting the treatment workflow.
3Ease of operation
If existing quality assurance methods are used, then the system is simpler to operate, but errors in treatment planning caused by incorrect input data cannot be detected
Solution Approach 1:
The patent introduces deformation mapping as an intermediary verification layer between the treatment plan and actual delivery. This intermediate step compares the planned anatomy with the actual patient anatomy using online imaging, detecting errors in treatment planning caused by incorrect input data without requiring complex manual verification procedures.
Data Source
AI summary
System and method of evaluating quality assurance criteria related to the delivery of a radiation therapy treatment plan. The method includes the acts of acquiring image data of a patient, generating a treatment plan for the patient based at least in part on the image data, the treatment plan including a calculated radiation dose to be delivered to the patient, acquiring an on-line image of the patient in substantially a treatment position, delivering at least a portion of the calculated radiation dose to the patient, monitoring quality assurance criteria related to the delivery of the treatment plan, calculating the radiation dose received by the patient, and determining whether delivery of the treatment plan occurred as intended based on the quality assurance criteria and the radiation dose received by the patient.