Automated RF Coil Tuning for MRI Frequency Matching
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Solution Overview
Problem
Current MRI systems lack efficient and automated methods for quickly and easily switching between different objects of varying shapes and sizes, and for compensating magnetic field frequency variations due to manufacturing and environmental changes, leading to lengthy and error-prone manual tuning of RF coils.
Innovation Solution
An automated RF tuning system using a motor and computer-readable medium that measures and aligns the RF magnetic field frequency with the main magnetic field frequency, allowing for rapid and precise adjustment of RF coils within an MRI device, with options for automatic or semi-automatic operation and visual/audio feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual tuning of RF coils is used to match frequency with main magnetic field, then frequency alignment can be achieved, but the process is time-consuming and error-prone
Solution Approach 1:
The system performs self-tuning by automatically measuring the resonant frequency of the RF coil and adjusting its position along the z-axis to achieve frequency matching with the main magnetic field, eliminating the need for manual operator intervention and trial-and-error adjustments
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated motor-driven positioning system that precisely controls RF coil location based on measured frequency deviations, substituting human operation with automated feedback control
2Adaptability or versatility
If manual adjustment of RF coil location is performed to compensate for magnetic field variability, then frequency matching can be achieved, but the system complexity and calibration effort increase
Solution Approach 1:
The system continuously measures the actual resonant frequency of the RF coil and uses this feedback to automatically adjust the coil's position along the z-axis, creating a closed-loop control system that adapts to magnetic field variations without complex manual calibration procedures
Solution Approach 2:
The patent changes the physical position parameter of the RF coil along the z-axis to compensate for magnetic field frequency variations, using position as a controllable variable to maintain frequency matching under different operating conditions
3Adaptability or versatility
If frequent switching between different objects of varying shapes and sizes is required, then versatility is improved, but manual repositioning and retuning becomes excessively time-consuming
Solution Approach 1:
The automated tuning system performs frequency measurement and coil repositioning automatically for each new scanning scenario, enabling rapid adaptation to different objects without manual intervention and maintaining high scanning throughput despite frequent changes
Solution Approach 2:
The system pre-positions the RF coil along the z-axis using motor-driven mechanisms before scanning begins, and performs automatic frequency matching in advance, so that when objects are changed, the system is already prepared and can quickly adapt without lengthy manual setup
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 quick and accurate alignment of RF and magnetic field frequencies within 30 seconds to 120 seconds, typically in 2 to 5 iterations, facilitating efficient handling of diverse objects and maintaining image quality across different scanning conditions.
Implementation Method 1
an automated RF tuning system comprising a motor and a computer readable medium configured to perform the following steps: measuring the frequency MM of the main magnetic field; measuring the frequency MRF of the RF magnetic field; comparing the frequency MM and the frequency MRF; and aligning the MM with the MRF, in a manner that if the MM and the MRF are substantially different, operating the motor by means of the computer readable medium to relocate the at least one RF coil thereby tuning the RF magnetic frequency MRF to align with the main magnetic frequency MM
Data Source
AI summary
An animal handling system for use in a magnetic resonance device (MRD) device, including: a first elongated enclosure having a proximal end, a distal open end and a first geometry, and a second elongated enclosure having a proximal end, a distal open end and a second geometry. The first geometry comprises a first cross-sectional area that is larger than a second cross-sectional area of the second geometry. The first elongated enclosure is inserted into a first input port of the MRD device and the second elongated enclosure is inserted in a second input port of the MRD device diametrically opposite to first input port. The first elongated enclosure and the second elongated enclosure are inserted into the respective input ports, the second elongated enclosure slides into the first elongated enclosure through the open distal end of the first elongated enclosure.