MRI Radial Scanning Fat Suppression Periodic Pulse
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Solution Overview
Problem
Radial scanning techniques face challenges in maintaining effective fat suppression over time in magnetic resonance imaging, particularly when acquiring T1-weighted images, as the fat suppression effect decreases due to the timing of fat saturation pulses in gradient echo sequences.
Innovation Solution
The magnetic resonance imaging apparatus executes a pulse sequence divided into outer and inner segments, where a fat saturation pulse is applied multiple times between inversion pulses, ensuring consistent fat suppression by radial scanning along k-space lines, thereby maintaining effective fat suppression throughout the imaging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fat saturation pulse is applied immediately before data acquisition in radial scanning, then fat suppression is achieved initially, but the fat suppression effect decreases over time
Solution Approach 1:
The patent applies the fat saturation pulse periodically at specific intervals (e.g., every 4-8 radial segments) rather than continuously or only once. This periodic application refreshes the fat suppression effect before it completely decays, maintaining consistent fat suppression throughout the radial scanning process while avoiding unnecessary repeated applications that would increase scan time.
2Reliability
If multiple fat saturation pulses are applied to maintain fat suppression, then fat suppression consistency is improved, but imaging time increases
Solution Approach 1:
The patent implements periodic application of fat saturation pulses at optimized intervals (every 4-8 radial segments) rather than continuous application. This timing is carefully selected to refresh the fat suppression effect just before it decays significantly, maintaining consistency while minimizing the number of pulses needed and thus keeping the imaging time acceptable.
Solution Approach 2:
The patent dynamically adjusts the timing and frequency of fat saturation pulse application based on the specific radial scanning parameters and desired fat suppression duration. The system adapts the pulse application strategy to match the decay characteristics of the fat saturation effect, optimizing the balance between suppression consistency and imaging efficiency for each specific imaging scenario.
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 approach mitigates the reduction of fat suppression effects, allowing for high-quality fat-suppressed T1-weighted images to be consistently produced, even during prolonged imaging sessions.
Implementation Method 1
a magnetic resonance imaging apparatus includes control circuitry that executes a pulse sequence
Implementation Method 2
In order to acquire T1-weighted images, an inversion pulse is applied as a preparation pulse prior to data acquisition
Implementation Method 3
an inversion pulse is applied as a preparation pulse prior to data acquisition
Implementation Method 4
a fat suppression pulse is additionally applied as a preparation pulse immediately before data acquisition, in order to acquire fat-suppressed T1-weighted images
Data Source
AI summary
According to one embodiment, a magnetic resonance imaging apparatus includes control circuitry that executes a pulse sequence divided into a plurality of first segments, and in which k-space is filled by radial scanning. In the first segment, a plurality of second segments are executed after application of a first preparation pulse. In the second segment, data acquisition along at least one line in k-space is performed after application of a second preparation pulse.