Gradient Echo MRI Steady-State Acquisition Before Physiological Triggers
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Solution Overview
Problem
Traditional methods for maintaining the steady-state of gradient echo sequences in MRI imaging compromise imaging efficiency, leading to poor quality due to motion artifacts from involuntary movements and physiological activities.
Innovation Solution
Perform a dummy scan until the gradient echo sequence reaches a steady-state and maintain it, then acquire magnetic resonance signals only when the sequence is in this steady-state, eliminating the need for repeated dummy scans upon each physiological trigger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional methods are used to maintain steady-state of gradient echo sequence, then imaging quality is improved, but imaging efficiency deteriorates due to repeated dummy scans
Solution Approach 1:
The system performs a preliminary dummy scan before physiological triggering to establish the steady-state of the gradient echo sequence. This preliminary action ensures that when the actual imaging is triggered by physiological signals, the sequence is already in the desired steady-state, eliminating the need for repeated dummy scans during the imaging process and thus improving efficiency while maintaining quality
Solution Approach 2:
The patent implements continuous dummy scanning throughout the imaging process to maintain the steady-state continuously rather than re-establishing it from scratch after each physiological trigger. This continuous maintenance of steady-state ensures consistent imaging quality while avoiding the time loss associated with repeated transitions to and from steady-state
2Reliability
If dummy scans are performed from the beginning each time physiological trigger is detected, then steady-state is achieved, but time consumption increases
Solution Approach 1:
The system performs the time-consuming dummy scan operation in advance, before physiological triggering occurs. This preliminary establishment of steady-state means that when imaging is actually needed and triggered by physiological signals, the system is already prepared and can immediately begin acquisition without repeating the dummy scan, thus achieving reliable steady-state while minimizing time loss
Solution Approach 2:
The patent dynamically adjusts the imaging workflow by continuously monitoring for physiological trigger signals and immediately transitioning to acquisition mode once the steady-state is established. This dynamic approach allows the system to adapt to real-time physiological conditions while maintaining optimal imaging conditions, reducing the time between steady-state achievement and actual imaging acquisition
Data Source
AI summary
Embodiments of the present disclosure provide a method, a system and a medium for magnetic resonance imaging (MRI), the method comprising: applying a gradient echo sequence to an object and performing a dummy scan on the object until a steady-state of the gradient echo sequence is reached; continuing the dummy scan and maintaining the steady-state of the gradient echo sequence; and in response to receiving a trigger signal while the gradient echo sequence is in the steady-state, acquiring a gradient echo magnetic resonance signal of the object. The system includes at least one processor; the at least one processor is configured to cause the system to perform the method for MRI.