Ablation Validation System Fiber Tract Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current clinical workflows for minimally invasive interstitial thermal therapy (LITT) procedures, such as stereotactic laser-guided amygdalohippocampectomy, face challenges in accurately detecting and monitoring the actual effect of ablation on target regions and functional integrity/connectivity of ablated areas, leading to suboptimal efficacy and repeated procedures.
Innovation Solution
The method involves comparing pre-ablation and intra- or post-ablation fiber tracts in the brain using diffusion tensor imaging (DTI) data, with a system that includes a computing device and MRI device to extract and visualize fiber tracts before and after ablation, providing a graphical representation for quantitative evaluation of ablation efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If post-operative T1W Mill imaging is used to estimate ablation volume, then ablation volume can be measured, but the measurement precision is compromised due to tissue contrast changes after ablation
Solution Approach 1:
The system performs DTI fiber tract extraction and visualization before ablation occurs, establishing a baseline of intact fiber tracts. This preliminary mapping allows for accurate pre-ablation connectivity assessment, enabling comparison with post-ablation states without being affected by post-ablation tissue contrast changes.
Solution Approach 2:
The patent introduces DTI fiber tractography as an intermediary method to assess ablation effects. Instead of directly measuring ablated tissue volume (which is obscured by contrast changes), the system uses fiber tract disruption as a mediator to indirectly but accurately evaluate ablation extent and functional impact.
2Reliability
If conventional LITT procedures are performed without fiber tract visualization, then the procedure can be completed, but the ability to detect and monitor actual ablation effect on functional integrity is lost
Solution Approach 1:
The system integrates multiple functions into a unified platform: DTI data acquisition, fiber tract extraction, 3D visualization, and quantitative analysis are combined in a single system. This multi-functional approach ensures reliable ablation assessment while managing complexity through integration rather than separate standalone components.
Solution Approach 2:
The system provides visual feedback by overlaying fiber tract trajectories on anatomical images and highlighting disrupted tracts after ablation. This feedback mechanism allows clinicians to immediately assess whether the ablation achieved the desired functional disconnection, enabling real-time validation of treatment efficacy.
3Reliability
If repeat ablations are performed to achieve seizure freedom, then seizure-free outcomes may be improved, but the loss of time and additional procedural risks increase
Solution Approach 1:
The system performs comprehensive fiber tract mapping and visualization before ablation to identify all critical tracts that need to be disrupted for seizure freedom. This preliminary planning ensures that the ablation targets are precisely defined, reducing the need for repeat procedures to achieve additional functional disconnection.
Solution Approach 2:
Post-ablation fiber tract visualization provides immediate feedback on whether sufficient tracts were disrupted to achieve seizure freedom. This feedback allows clinicians to confirm treatment adequacy during the same procedural session, eliminating the need for repeat ablations and reducing overall treatment time.
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 allows for more accurate quantification of ablation extent, improving the efficacy of LITT procedures, reducing the need for repeat ablations, and enhancing seizure-free outcomes in treating medically intractable epilepsy and brain tumors.
Implementation Method 1
obtaining magnetic resonance (MR) data of the patient's brain, by use of a magnetic resonance imaging (MRI) device
Implementation Method 2
obtaining first imaging data of the patient's brain... obtaining second imaging data of the patient's brain... In some embodiments, the first and second imaging data include diffusion tensor imaging (DTI) data
Implementation Method 3
an ablation catheter delivers heat to target cells by emitting collimated light through a diffusing tip, heating the target cells to 40° C. or higher
Implementation Method 4
heating the target cells to 40° C. or higher. When heated to a temperature between 40° C. and 60° C., the target cells suffer irreversible cell damage
Implementation Method 5
a polycarbonate cooling catheter with a diode laser fiber is inserted along the path to the ablation target
Implementation Method 6
When the target cells are heated to above 100° C., water in the target cells vaporizes and surrounding tissues carbonize
Data Source
AI summary
Devices, systems, methods for validating ablation results in a patient's brain are provided. In some embodiments, the method for validating ablation result in a patient's brain includes obtaining magnetic resonance (MR) data of the patient's brain, by use of a magnetic resonance imaging (MRI) device; obtaining first imaging data of the patient's brain, by use of the MRI device; extracting, by use of computing device in communication with the MRI device, first fiber tracts passing through an anatomy in the patient's brain based on the first imaging data; obtaining, by use of the MRI device, second imaging data of the patient's brain after ablation of the anatomy in the patient's brain has started; extracting second fiber tracts passing through the anatomy in the patient's brain based on the second imaging data; and outputting a graphical representation of a comparison between the first fiber tracts and the second fiber tracts.