TTFields Electrode Placement Using 3D Power Loss Density
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Solution Overview
Problem
Existing methods for positioning electrodes for Tumor Treating Fields (TTFields) treatment are based on electric field intensity simulations, which do not adequately consider the energy transfer and power loss density, leading to suboptimal treatment efficacy.
Innovation Solution
A method involving 3D modeling of electrical conductivity and resistivity to determine power loss density distributions for various electrode placements, selecting positions that maximize power loss density to optimize TTFields delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrode positioning is optimized based on electric field intensity simulations, then field distribution is improved, but energy transfer efficiency and power loss density are not adequately considered
Solution Approach 1:
The patent changes the optimization parameter from electric field intensity to power loss density. By calculating and optimizing based on power loss density (which incorporates both field intensity and tissue conductivity), the system achieves better energy transfer efficiency while maintaining adequate field distribution. This parameter change resolves the contradiction by making energy transfer efficiency the primary optimization criterion rather than just field intensity.
2Device complexity
If traditional electrode positioning methods are used, then treatment planning is simpler, but treatment efficacy is suboptimal
Solution Approach 1:
The patent replaces the traditional mechanical/electrical simulation approach (based on electric field intensity) with a computational approach based on power loss density calculations. This substitution uses mathematical modeling that incorporates both field intensity and tissue conductivity properties, resulting in more accurate treatment planning. The complexity increase is justified by the significant improvement in treatment efficacy and energy transfer efficiency.
3Use of energy by moving object
If power loss density is used to optimize electrode positioning, then energy delivery to target volume is improved, but calculation complexity increases
Solution Approach 1:
The patent performs preliminary calculations of power loss density for multiple electrode positioning scenarios before actual treatment. By pre-calculating and comparing power loss density distributions for different electrode configurations, the system identifies optimal positioning in advance. This preliminary action reduces the complexity of real-time decision-making and justifies the computational effort by enabling systematic comparison of multiple treatment scenarios.
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
Enhances treatment efficacy by ensuring consistent and effective energy delivery to target volumes, improving overall survival and progression-free survival in cancer patients.
Implementation Method 1
determining, for each of the voxels in the target volume, a power loss density that will be present when the first set of model electrodes positioned at the first set of locations is used to impose an alternating electric field in the target volume
Data Source
AI summary
The planning of treatment using tumor treating fields (TTFields) in a portion of a subject's body (e.g., the subject's head) can be improved by obtaining an image of the body portion, and generating, based on the image, a 3D model of electrical conductivity. A target volume within the 3D model is identified, and a set of model electrodes is added to the 3D model at given locations. Then, for each voxel in the target volume, the power loss density (PLD) that will be present when TTFields are eventually applied is determined. The same process is repeated for a plurality of different electrode locations. Finally, the set of electrode locations that yielded the best PLD is selected, and a description of those locations is output.