Quantum Spin Magnetometer for MRI Signal Detection
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Solution Overview
Problem
Current magnetic resonance imaging (MRI) technologies face limitations in sensitivity, particularly at low field strengths and with small reception coil elements, due to coil noise, and existing quantum magnetometers struggle with dynamic range and frequency bandwidth, making them unsuitable for clinical MRI applications.
Innovation Solution
A measurement device combining a highly sensitive quantum spin magnetometer with a robust vector magnetometer, utilizing a sensor material like diamond with nitrogen vacancy centers, which uses the strong external magnetic field as a bias field and eliminates the need for frequency sweeps by direct conversion of magnetic resonance signals into analog optical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional copper reception coils are used, then the device complexity is low and ease of manufacture is high, but the measurement precision and sensitivity are limited by coil noise
Solution Approach 1:
The patent introduces a quantum sensor as an intermediary component between the magnetic resonance source and the conventional reception coil. This quantum sensor acts as a mediator that amplifies weak magnetic signals before they reach the conventional coil, thereby improving sensitivity without requiring complete replacement of the conventional coil system.
Solution Approach 2:
The patent employs composite sensing structures that combine conventional copper coil elements with quantum sensing materials. This composite approach allows the system to leverage the well-established electrical properties of copper while incorporating the high sensitivity of quantum sensors, achieving improved measurement precision without entirely abandoning conventional manufacturing approaches.
2Measurement precision
If quantum magnetometers are used to improve sensitivity, then the measurement precision improves, but the device complexity increases and ease of operation decreases
Solution Approach 1:
The quantum sensor system is designed to automatically compensate for environmental disturbances and calibration drift without requiring manual intervention. The system performs self-calibration routines and automatically adjusts to maintain optimal sensitivity, thereby reducing the operational burden on users despite the increased device complexity.
Solution Approach 2:
The patent implements feedback mechanisms where the quantum sensor continuously monitors magnetic field conditions and automatically adjusts its operating parameters to maintain optimal performance. This closed-loop control system simplifies operation by eliminating the need for manual tuning while maintaining high measurement precision.
3Measurement precision
If high field strengths are used to improve sensitivity, then the measurement precision improves, but the loss of energy increases and temperature requirements become more stringent
Solution Approach 1:
The patent replaces mechanical cooling systems with quantum-based sensing mechanisms that operate at or near room temperature. By using quantum sensors that do not require cryogenic temperatures, the system achieves high sensitivity without the complex thermal management infrastructure needed for conventional low-temperature quantum devices.
Solution Approach 2:
The patent changes the operating parameters of the quantum sensor to function effectively at higher temperatures and lower magnetic field strengths compared to conventional quantum magnetometers. This parameter optimization allows the system to achieve high sensitivity without requiring ultra-low temperature environments or extremely high magnetic fields.
4Productivity
If parallel imaging with multiple reception coil elements is used to improve productivity, then the productivity increases, but the measurement precision decreases due to coil noise dominance
Solution Approach 1:
The patent divides the reception system into multiple independent quantum sensing elements, each capable of detecting magnetic signals with high sensitivity. By segmenting the sensing function across multiple quantum elements rather than relying on a single conventional coil, the system achieves both parallel imaging capability and high signal-to-noise ratio.
Solution Approach 2:
The patent combines multiple quantum sensor outputs with conventional coil signals in a hybrid reception system. This merging of quantum and classical sensing approaches allows the system to leverage the high sensitivity of quantum sensors while maintaining the signal amplification capabilities of conventional coils, thereby improving both productivity and measurement precision simultaneously.
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 solution provides high sensitivity and dynamic range, enabling real-time measurement of magnetic resonance signals and multiple magnetic field parameters across a wide range, suitable for clinical MRI scanners, while reducing sampling time and maintaining compatibility with existing hardware.
Implementation Method 1
the spin defect center has Zeeman splitting states dependent on an external magnetic field of the magnetic resonance device
Implementation Method 2
an optical excitation source and a microwave excitation source for electromagnetically exciting the sensor material element
Implementation Method 3
an optical excitation source and a microwave excitation source for electromagnetically exciting the sensor material element
Implementation Method 4
a measurement unit for measuring optical signals emitted by the excited sensor material element and depending on the Zeeman splitting states
Data Source
AI summary
A measurement device for measuring MR signals in a MR device may include first and second magnetometers and a controller. The first magnetometer may be a quantum spin magnetometer that includes a sensor material having a spin defect center including Zeeman splitting states dependent on an external magnetic field of the MR device, an optical excitation source and a microwave excitation source for electromagnetically exciting the sensor material, and a measurement sensor for measuring optical signals emitted by the excited sensor material element and depending on the Zeeman splitting states. The controller may be configured to determine a working frequency of the microwave excitation source of the first magnetometer from the total magnetic field strength measured by the second magnetometer, and control the microwave excitation source to use the determined working frequency as microwave frequency, such that the first magnetometer measures the MR signals as the optical signal.