Oblique MRI Gradient Waveform Coordinate Transformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Oblique plane scanning in MRI systems faces challenges in acquiring suitable scanning parameters such as short scanning sequence repetition time (TR), echo time (TE), and echo interval (ESP) due to limitations in gradient coil hardware, leading to inefficiencies in gradient waveform design and increased complexity in calculating control parameters for gradient amplifiers.
Innovation Solution
The method involves generating an initial physical axis gradient waveform with consistent inflection times for multiple axes, converting it into a logical axis waveform, and then re-converting it back to a physical axis waveform to drive gradient amplifiers during oblique scanning, optimizing waveform design to align with hardware capabilities and reduce TR and TE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If oblique plane scanning is performed in MRI systems, then imaging flexibility and clinical applicability are improved, but gradient waveform design complexity and hardware utilization efficiency deteriorate
Solution Approach 1:
The patent introduces a coordinate transformation intermediary that converts gradient waveform calculations from physical coil coordinates to logical imaging coordinates. This intermediary transformation layer simplifies the complex relationship between physical gradient coils and oblique imaging planes, making waveform design more manageable while maintaining imaging flexibility.
Solution Approach 2:
The patent changes the parameter representation by transforming gradient waveforms from physical coil space to logical image space through coordinate transformations. This parameter change approach allows independent optimization of imaging parameters without being constrained by physical coil configurations, reducing design complexity.
2Adaptability or versatility
If oblique plane scanning is performed in MRI systems, then imaging flexibility is improved, but scanning parameters such as TR and TE become harder to optimize
Solution Approach 1:
The coordinate transformation system acts as an intermediary that decouples the relationship between oblique imaging requirements and gradient coil control. This allows independent optimization of scanning parameters like TR and TE in logical space, then transforms them to physical coil commands, enabling time parameter optimization without sacrificing imaging flexibility.
Solution Approach 2:
The patent implements dynamic coordinate transformation that adapts to different oblique scanning configurations. By making the transformation matrix dynamic and configurable, the system can optimize scanning parameters for each specific clinical application, reducing scanning time while maintaining the required imaging flexibility.
3Ease of operation
If direct physical axis gradient waveform generation is used for oblique scanning, then hardware control is simplified, but gradient capacity utilization and imaging quality deteriorate
Solution Approach 1:
The patent introduces a two-stage transformation process where logical axis waveforms (optimized for imaging quality) are transformed to physical axis commands (compatible with hardware). This intermediary logical coordinate system allows independent optimization of imaging quality parameters while maintaining simple hardware control through the final transformation step.
Solution Approach 2:
The patent segments the waveform generation process into two independent stages: logical axis waveform design (optimized for imaging quality) and physical axis transformation (optimized for hardware control). This segmentation allows each stage to be optimized independently, achieving both high imaging quality and simple hardware control.
Data Source
AI summary
The present disclosure relates to an MRI system and a method and device for determining a waveform of oblique scanning. Specifically, provided are a magnetic resonance imaging system, a method and device for determining a gradient waveform of oblique scanning, and a computer-readable storage medium. The method includes: generating an initial physical axis gradient waveform on a physical axis, the physical axis including a first physical axis, a second physical axis, and a third physical axis, wherein gradient waveforms on the three physical axes have the same inflection time; converting the initial physical axis gradient waveform into a logical axis gradient waveform, an inflection point of the logical axis gradient waveform being the same as the inflection time of the initial physical axis gradient waveform; re-converting the logical axis gradient waveform into a physical axis gradient waveform; and using, during the oblique scanning of magnetic resonance imaging, the converted physical axis gradient waveform to drive a gradient amplifier.