BOLD Simulation Phantom for fMRI Accuracy and Repeatability
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Solution Overview
Problem
The accuracy and repeatability of brain function imaging using BOLD signals in magnetic resonance imaging are low due to the short duration of BOLD signals, making it difficult to verify brain function areas and resulting in controversial analysis results.
Innovation Solution
A functional magnetic resonance imaging quality detection phantom with a BOLD simulation module that simulates regional T2* signal changes using an external current, combined with basic imaging detection modules for resolution, geometric distortion, and signal-to-noise ratio testing, and a programmable power supply controller for remote control of the simulation module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If BOLD signals are used for brain function imaging, then functional brain areas can be detected, but the accuracy and repeatability are low due to the short signal duration (3-6 ms)
Solution Approach 1:
The patent creates a physical phantom that copies and simulates the BOLD signal characteristics in a stable, repeatable manner. The phantom replicates the T2* signal changes that occur during actual brain activation, allowing researchers to practice and validate imaging protocols without relying on transient biological signals. This copying approach enables repeated measurements with consistent results, directly addressing the repeatability issue.
Solution Approach 2:
The phantom allows preliminary testing and optimization of imaging sequences, analysis pipelines, and experimental protocols before actual brain imaging. By performing all calibration, parameter optimization, and method validation on the phantom first, researchers can ensure maximum accuracy when imaging actual brain function, effectively preparing in advance to overcome the limitations of short-duration BOLD signals.
2Productivity
If fast imaging sequence scanning is used to detect T2* signal differences, then brain function areas can be identified, but the results are controversial due to inability to verify with anatomical gold standard
Solution Approach 1:
The phantom serves as a self-contained verification system that provides its own ground truth. The known locations and characteristics of simulated activation areas within the phantom allow automatic validation of imaging results without requiring external anatomical references or manual verification. This self-service capability enables immediate reliability assessment of fast imaging sequences.
Solution Approach 2:
The phantom provides immediate feedback on the accuracy and performance of imaging sequences and analysis methods. By comparing the detected activation areas against the known ground truth embedded in the phantom design, researchers can iteratively optimize their imaging protocols to achieve both high speed and high reliability, resolving the controversy through systematic validation.
3Measurement precision
If a simulative BOLD signal phantom is created, then accuracy and repeatability can be improved, but the device complexity increases with multiple modules and control systems
Solution Approach 1:
The phantom is designed as a multi-functional system that simultaneously provides anatomical reference structures, simulated activation areas with known characteristics, and validation targets for various imaging parameters. This universal design consolidates multiple verification functions into a single integrated device, reducing the need for multiple separate phantoms or reference materials and thereby managing complexity while maintaining high measurement precision.
4Adaptability or versatility
If external current is used to disturb magnetic field uniformity and form BOLD simulation module, then regional T2* signal changes can be created, but the control system requires programmable power supply for remote operation
Solution Approach 1:
The phantom incorporates dynamically controllable elements through the programmable power supply system, allowing the BOLD simulation module to adapt its characteristics in real-time. The ability to remotely control current parameters enables flexible adjustment of simulated activation patterns, timing, and intensity, providing high versatility for different experimental protocols while managing control complexity through standardized interfaces.
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 phantom provides a high morphological simulation of brain imaging, improves the accuracy and reliability of brain function imaging, and allows for remote control of the simulation, enhancing the safety and effectiveness of the imaging process.
Implementation Method 1
Magnetic resonance brain function imaging is based on the BOLD phenomenon. T2* signal (actual T2 relaxation time) difference (task state functional magnetic resonance) between the task state brain section image and the static state brain section image is generally detected
Implementation Method 2
T2* signal (actual T2 relaxation time) difference (task state functional magnetic resonance) between the task state brain section image and the static state brain section image is generally detected through fast imaging sequence scanning
Implementation Method 3
the uniformity of a magnetic field is disturbed by an external current to form a BOLD simulation module with regional T2* signal changes (enhancement)
Data Source
AI summary
Disclosed is a functional magnetic resonance imaging quality detection phantom and method. The phantom includes two independent shells which are movably connected with each other, wherein a BOLD simulation signal module is arranged in the first shell, and a basic imaging detection module is arranged in the second shell; the BOLD simulation signal module includes a locating accuracy test component and a BOLD signal simulation component, the locating accuracy test component includes two locating blocks placed in a crossing manner, a wedge-shaped passage composed of isosceles right triangle blocks is arranged on the locating blocks, and the BOLD signal simulation component includes an artificial brain for functional magnetic resonance imaging; and the present invention can simulate human body BOLD signal changes and simulate a brain activation area in a magnetic resonance system, and is for the test analysis and researches on the accuracy, reliability and repeatability of brain function imaging.