MRI RF Frequency Adjustment Using Navigator Phase Drift Detection
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Solution Overview
Problem
Radio frequency (RF) pulse frequency drift during medical imaging necessitates real-time adjustments to maintain image quality and spectral accuracy.
Innovation Solution
A system and method for real-time frequency adjustment during medical imaging using a navigator signal to determine phase change information and adjust RF pulse frequency, localized to an imaging region of interest, without requiring a calibration scan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time frequency adjustment is implemented during medical imaging, then image quality and spectral accuracy are improved, but system complexity and processing requirements increase
Solution Approach 1:
The system continuously monitors the actual RF pulse frequency during medical imaging acquisition and compares it against the desired frequency. Based on this feedback, the system automatically adjusts the frequency in real-time to maintain spectral accuracy and image quality without requiring complex manual calibration procedures
Solution Approach 2:
The frequency adjustment mechanism operates autonomously during the imaging process, using internally acquired navigator signals to detect frequency drift and automatically correcting it without external intervention. This self-correcting capability improves spectral accuracy while avoiding the need for additional complex calibration equipment
2Reliability
If frequency adjustment is performed during each TR, then frequency drift is corrected continuously, but processing time and computational load increase
Solution Approach 1:
The system performs frequency measurement and adjustment at periodic intervals corresponding to each repetition time (TR) cycle of the medical imaging sequence. This periodic approach ensures continuous frequency stability while maintaining synchronization with the existing imaging rhythm, avoiding additional processing time between TR cycles
Solution Approach 2:
Navigator signals are acquired and processed in advance during the TR interval, allowing frequency drift to be detected and corrected before the next imaging data acquisition begins. This preliminary frequency adjustment ensures that frequency corrections are ready before they are needed, maintaining reliability without extending total scan time
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 improved image and spectral quality by continuously updating RF pulse frequency, reducing the need for pre-imaging calibration and streamlining the imaging process.
Implementation Method 1
determine phase change information from a navigator signal acquired after the navigator is applied
Data Source
AI summary
A system for performing a real-time frequency adjustment during medical imaging includes at least one memory and at least one processor. The at least one memory is configured to store instructions and the at least one processor is configured to execute the instructions to cause the system to apply a navigator before a repetition time (“TR”) variant spatial-encoding event of a first TR of a plurality of TRs, determine phase change information from a navigator signal acquired after the navigator is applied, and adjust a radio frequency (“RF”) pulse frequency of the medical imaging based on the phase change information.