Brachytherapy Applicator Localization via MR Hyperintense Contrast
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Solution Overview
Problem
Conventional brachytherapy treatment planning methods face challenges in accurately determining the position of applicators due to poor soft tissue contrast in computed tomography images, making it difficult to distinguish applicators from surrounding tissue and create precise radiation treatment plans.
Innovation Solution
The method employs magnetic resonance imaging with specific sequences that enhance contrast between applicators and surrounding tissue, allowing for the easy extraction of applicator positions, which are then used to create radiation treatment plans, incorporating anatomical information and dose distribution calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If computed tomography imaging is used for brachytherapy treatment planning, then the imaging speed and availability are improved, but the soft tissue contrast and applicator distinguishability deteriorate
Solution Approach 1:
The patent combines CT imaging with MR imaging to create a fused image dataset. The CT provides rapid anatomical overview and bone structure, while MR provides superior soft tissue contrast. By merging these two imaging modalities, the system achieves both fast imaging capability and high precision applicator localization through the MR component's superior soft tissue differentiation.
2Measurement precision
If conventional magnetic resonance sequences are used, then the soft tissue contrast is improved, but the applicator visibility and contrast deteriorate due to signal extinction
Solution Approach 1:
The patent employs specific MR sequence parameter optimization including spin-echo or gradient-echo sequences with tailored echo times (TE) and repetition times (TR). These parameter adjustments create favorable magnetic contrast conditions where applicators exhibit hyperintense or hypointense signals relative to surrounding tissues, resolving the signal extinction problem while preserving soft tissue differentiation capability.
3Measurement precision
If high resolution imaging is used to improve applicator position extraction, then the measurement precision is improved, but the scanning time and productivity deteriorate
Solution Approach 1:
The patent segments the imaging process into two distinct phases: a comprehensive low-resolution survey scan for overall anatomical coverage, followed by targeted high-resolution focused scans only in regions containing applicators or critical structures. This segmentation reduces total scanning time while maintaining high precision where needed, thereby improving treatment planning efficiency without sacrificing accuracy.
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 provides improved accuracy in radiation treatment planning by clearly delineating applicator positions and surrounding tissues, enabling more precise dose delivery and minimizing radiation exposure to healthy tissues.
Implementation Method 1
Magnetic resonance image data of a patient are acquired by operating a magnetic resonance scanner with a magnetic resonance sequence
Data Source
AI summary
In a method and system for planning a brachytherapy treatment, magnetic resonance image data of a patient are acquired by operating a magnetic resonance scanner according to a magnetic resonance sequence that designates an examination volume. An area of the patient is positioned in the examination volume such that the magnetic resonance image data contain at least a part of at least one applicator for the brachytherapy, which is located in the patient. The magnetic resonance sequence includes measurement parameters that lead to a contrast between the at least one applicator and surrounding tissue in the magnetic resonance image data. The position of the at least one applicator in the magnetic resonance image data is extracted, and a radiation treatment plan is created using the extracted position of the at least one applicator.