fNIRS-guided TMS Dosing for Prefrontal Cortex
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Transcranial Magnetic Stimulation (TMS) systems lack an effective method to determine the sufficient power or 'dose' for treating areas like the prefrontal cortex for depression, leading to variable treatment outcomes.
Innovation Solution
Integration of Functional Near-Infrared Spectroscopy (fNIRS) with TMS to non-invasively measure hemodynamic responses, allowing for real-time adjustment of stimulation parameters such as location, frequency, and duration to ensure adequate treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TMS power is increased to ensure adequate treatment of the prefrontal cortex, then treatment efficacy is improved, but the risk of adverse effects and cortical over-excitability increases
Solution Approach 1:
The system employs real-time fNIRS feedback to monitor hemodynamic responses in the prefrontal cortex during TMS treatment. The fNIRS device continuously measures oxygenated and deoxygenated hemoglobin levels, providing immediate feedback about cortical activation status. This feedback loop allows dynamic adjustment of TMS parameters to maintain therapeutic efficacy while preventing cortical over-excitability and adverse effects.
Solution Approach 2:
The system dynamically adjusts TMS stimulation parameters (intensity, frequency, pulse duration) based on real-time fNIRS measurements of cortical hemodynamic response. By changing these parameters in response to measured brain activity, the system optimizes the balance between achieving sufficient cortical activation for treatment efficacy and avoiding excessive stimulation that could cause adverse effects.
2Measurement precision
If fNIRS is integrated with TMS to enable real-time measurement and adjustment, then treatment personalization and accuracy are improved, but device complexity increases
Solution Approach 1:
The system merges TMS and fNIRS devices into an integrated platform where the TMS coil and fNIRS sensors are positioned to simultaneously deliver stimulation and measure hemodynamic response from the same prefrontal cortex region. This spatial and functional merging allows direct correlation between stimulation parameters and cortical activation, improving measurement precision while managing complexity through unified system control.
Solution Approach 2:
The integrated system performs multiple functions: TMS delivers neuromodulation stimulation, fNIRS measures cortical activation, and the combined system provides real-time feedback for parameter adjustment. This multi-functionality allows a single integrated platform to accomplish treatment delivery, monitoring, and optimization, improving measurement precision while consolidating rather than multiplying separate devices.
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
The TMS-fNIRS system provides accurate calibration of TMS doses to the prefrontal cortex, improving treatment efficacy and personalization for individual patients, particularly for treatment-resistant depression.
Implementation Method 1
A TMS system includes an electric pulse generator or stimulator that is connected to a magnetic coil that is connected to the scalp to generate a varying magnetic field via electromagnetic induction to cause an electric current at a specific area of the brain
Implementation Method 2
The exemplary fNIRS system is configured to non-invasively measure the hemodynamic response, including blood flow and oxygenation, to assess cortical brain function
Data Source
AI summary
A system may measure, via a functional Near-Infrared Spectroscopy (fNIRS) device, a first set of measurements of a prefrontal cortex region of a patient. The system may perform, via a transcranial magnetic stimulation (TMS) device, TMS treatment to the prefrontal cortex region for therapeutic effect. The fNIRS device may measure a second set of measurements of the prefrontal cortex region. The system includes a processor to determine an applied dosing of the TMS treatment based on the first set of measurements and/or the second set of measurements. The system may output control feedback to the TMS device or visualization to a display to adjust one or more parameters or localization of the TMS treatment based on the applied dosing. The system personalizes the treatment dosing of TMS more accurately over the prefrontal cortex by calibrating the dose to the prefrontal cortex based on measurements from the fNIRS device.