Wireless MRI Coil Using QPSK Modulation for Data Rate
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Solution Overview
Problem
Current magnetic resonance wireless local coils face limitations in data transmission rate, complexity in design and implementation, and inefficiencies due to single-coil induction, high power requirements, and limited transmission distance, especially in the 5.8 GHz ISM band and 60 GHz bands.
Innovation Solution
A magnetic resonance wireless receiving coil device comprising multiple transmitters and receivers, each with a coil group, ADCs, baseband low-pass filters, and an IQ modulation transmitter, using QAM modulation to increase data transmission efficiency and simplify implementation, particularly utilizing the 5.8 GHz ISM band for improved signal penetration and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single induction coupling coil is used, then the device complexity is reduced, but the amount of magnetic resonance information transmitted is insufficient
Solution Approach 1:
The patent divides the wireless coil system into multiple independent coils, each capable of inducing magnetic resonance information. By segmenting the single coil into multiple coils arranged in specific spatial configurations, the system increases the total amount of magnetic resonance information that can be transmitted while maintaining manageable complexity through modular design
2Productivity
If QAM 256 modulation is used in 5.8 GHz ISM band, then data transmission rate is improved, but implementation complexity increases due to FPGA and DAC requirements
Solution Approach 1:
The patent changes the modulation parameter from QAM 256 to QPSK (Quadrature Phase Shift Keying). This parameter change reduces the complexity requirements while maintaining adequate data transmission capability. QPSK requires simpler hardware implementation without needing high-speed DACs and complex FPGA processing, thus resolving the contradiction between transmission rate and implementation complexity
3Ease of manufacture
If standard Wi-Fi products are used, then ease of manufacture is improved, but power consumption and shielding requirements increase
Solution Approach 1:
The patent extracts and removes the operating system and protocol management layers from the Wi-Fi system. By using a simplified wireless communication approach without requiring full Wi-Fi protocol stacks, the system eliminates the need for high-power processors and complex shielding, thereby reducing power consumption while maintaining ease of manufacture through dedicated hardware design
4Productivity
If 60 GHz band is used, then data transmission rate is improved, but signal attenuation and absorption by body or clothes increases
Solution Approach 1:
The patent changes the operating frequency parameter from 60 GHz to 5.8 GHz. This frequency reduction decreases signal attenuation and absorption by the human body and clothing, improving penetration capability. The 5.8 GHz frequency still provides adequate bandwidth for high-speed data transmission while offering better practical performance in wireless MRI applications
5Productivity
If UWB frequency range is used, then data transmission rate is improved, but system complexity increases due to frequency assignment and power limitations
Solution Approach 1:
The patent implements a universal wireless coil design where multiple coils operate at the same 5.8 GHz frequency rather than assigning different UWB frequencies to different coils. This universal frequency approach simplifies the system by eliminating the need for complex frequency management and power distribution schemes, while still achieving high data transmission rates through spatial multiplexing of multiple coils
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 solution enhances magnetic resonance information transmission per unit frequency band, reduces implementation complexity, and supports high-speed data transmission while simplifying coil design and reducing power consumption, allowing flexible expansion of receiving channels.
Implementation Method 1
coil group, configured to receive an MR signal
Data Source
AI summary
A MR wireless receiving coil device may include transmitters and receivers, the number of the receivers being equal to or greater than the number of the transmitters; each transmitter comprises: a coil group, an ADC group, two baseband low-pass filters, and an IQ modulation transmitter, wherein the coil group is connected to the ADC group, the ADC group is connected to the two baseband low-pass filters, the two baseband low-pass filters are connected to the IQ modulation transmitter, and the IQ modulation transmitter is provided with an antenna; each coil group contains one or more coils, and the maximum number of coils contained in each coil group is determined by available bandwidth, modulation scheme, and the bandwidth, sampling rate, and sampling accuracy of MR signal. The device and corresponding method advantageously allows an increase in the amount of magnetic resonance information transmitted per unit frequency band.