Non-Invasive Mitochondrial Function Assessment via Cyclic Oxygenation fMRI
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Solution Overview
Problem
Current methods lack a non-invasive means to effectively assess mitochondrial function in vivo, particularly in a spatially specific manner, which is crucial for diagnosing and monitoring various pathological conditions and therapeutic efficacy, as mitochondrial dysfunction is a key factor in numerous diseases including traumatic brain injury, neurodegenerative disorders, and heart diseases.
Innovation Solution
A 4D Oxy-wavelet MRI system and method that uses periodic hypoxia challenges and 4D BOLD fMRI data acquisition to assess mitochondrial function by analyzing oxygen homeostasis and structural properties in live tissue, enabling high-resolution, motion-resolved imaging of the brain and heart, and utilizing AI-based analysis for diagnostic purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional BOLD fMRI is used to map brain activation, then functional information can be obtained, but spatial resolution is reduced and signal-to-noise ratio is low
Solution Approach 1:
The patent applies periodic hypoxia challenges (cyclic oxygenation) to the subject during fMRI data acquisition. This periodic stimulation creates repeatable hemodynamic responses that can be averaged across multiple cycles, thereby improving signal-to-noise ratio while maintaining spatial resolution. The cyclic nature of the hypoxia challenges allows for accumulation of functional information without sacrificing anatomical detail.
Solution Approach 2:
The patent changes the oxygenation parameter by introducing periodic hypoxia challenges during the imaging process. This parameter change creates detectable BOLD signal variations that enhance the functional measurement capability. By modulating the oxygen supply in a controlled cyclic manner, the system can distinguish functional activity from background noise while preserving spatial information.
2Speed
If BOLD fMRI is conducted with larger voxel sizes to capture fast dynamic information, then temporal resolution is improved, but spatial resolution deteriorates
Solution Approach 1:
By using periodic hypoxia challenges, the patent creates time-synchronized hemodynamic responses that can be analyzed across multiple cycles. This allows for temporal resolution to be maintained with smaller voxels, as the repeated stimulation provides sufficient signal strength even at higher spatial resolutions.
Solution Approach 2:
The patent maintains continuous fMRI data acquisition throughout the cyclic oxygenation period, ensuring that both temporal and spatial information are captured continuously. This continuous monitoring approach allows for high temporal resolution without requiring larger voxels, as the uninterrupted data stream provides sufficient signal for temporal analysis at fine spatial scales.
3Measurement precision
If conventional fMRI is used, then functional information can be obtained, but it cannot be applied to moving organs like the heart due to motion artifacts
Solution Approach 1:
The patent uses periodic hypoxia challenges that create synchronized hemodynamic responses even in moving organs. The cyclic nature of the stimulation provides a temporal reference frame that can be used to track and compensate for motion, allowing functional measurements in the heart and other moving tissues without the usual motion artifact limitations.
Solution Approach 2:
The patent employs self-gating techniques where the periodic physiological responses (such as cardiac cycles or respiratory patterns) are used themselves as reference signals for motion correction. The cyclic oxygenation challenges create inherent temporal markers that allow the system to automatically track and correct for organ motion without external intervention.
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
Enables non-invasive, spatially specific assessment of mitochondrial function with high temporal and spatial resolution, facilitating early detection of mitochondrial dysfunction and potential therapeutic monitoring, applicable to both humans and animals, including prenatal diagnosis.
Implementation Method 1
Blood-oxygen-level-dependent (BOLD) contrast has been used as a fMRI method to map human and animal brain activation and functional connectivity for decades
Implementation Method 2
deoxy-hemoglobin is paramagnetic and can thus decrease MRI signals
Data Source
AI summary
A method of non-invasively assessing mitochondrial function in live tissue of a subject includes providing periodic hypoxia challenges to the subject during a cyclic oxygenation period, acquiring 4D BOLD fMRI data from the live tissue of the subject during the cyclic oxygenation period, and analyzing the acquired 4D BOLD fMRI data to determine a measure of mitochondrial function for each of a number of regions of the live tissue. Also, a system for non-invasively assessing mitochondrial function includes an fMRI system including a magnet, an RF system and a controller, wherein the controller is structured and configured to acquire 4D BOLD fMRI data from the live tissue of the subject during a cyclic oxygenation period wherein periodic hypoxia challenges are experienced by the subject, and analyze the acquired 4D BOLD fMRI data to determine a measure of mitochondrial function for each of a number of regions of the live tissue.