Spiral MR Acquisition Template for Dynamic Imaging
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Solution Overview
Problem
Current magnetic resonance imaging (MRI) techniques face challenges in effectively capturing dynamic movements such as breathing and heartbeat without requiring additional navigators like hemidiaphragmatic or external ECG signals, and struggle with achieving high temporal resolution and quality images, especially with undersampling in k-space.
Innovation Solution
The method generates an acquisition template with spiral-like spokes in k-space, utilizing a golden angle offset between spokes and incorporating unsharpness values to increase irregularity, allowing for self-navigation and efficient data acquisition, which enables high temporal resolution and quality image generation even with undersampling, by using a combination of Fourier transforms and compressed sensing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional MRI acquisition templates are used, then image quality can be maintained, but temporal resolution deteriorates when following dynamic movements
Solution Approach 1:
The k-space is divided into multiple spiral-like spokes that are sampled sequentially. Each spoke represents a segment of the k-space trajectory, allowing the acquisition to be divided into discrete temporal samples that can be reconstructed into dynamic images with high temporal resolution.
Solution Approach 2:
The acquisition template uses dynamic spiral-like spokes that can adapt to moving structures. The spokes are designed to follow the contours of moving organs such as the liver, automatically adjusting to breath and heartbeat movements without requiring external navigators, thereby maintaining both temporal resolution and image quality.
2Loss of time
If additional navigators like hemidiaphragmatic or external ECG signals are used to follow dynamic movements, then temporal resolution can be improved, but device complexity increases
Solution Approach 1:
The MRI system performs self-navigation by using the acquired k-space data itself to detect breath and heartbeat movements. The spiral-like spokes are designed to sample the k-space in a pattern that inherently contains navigation information, eliminating the need for separate external navigator systems or additional hardware sensors.
Solution Approach 2:
The same spiral-like spoke acquisition template serves multiple functions: it simultaneously performs image encoding and breath/heartbeat navigation. The spokes are designed to capture both diagnostic image information and physiological motion information in a single acquisition, making the system multi-functional without requiring separate dedicated navigator hardware.
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 allows for the generation of high-quality MRI images that follow dynamic movements without the need for additional navigators, achieving high temporal resolution and quality even with partial k-space sampling, thereby improving diagnostic imaging capabilities.
Implementation Method 1
Magnetic resonance tomography, MRT (also magnetic resonance imaging, MRI) is an imaging examination method that is used primarily in medical diagnostics for representing the structure and function of tissues and/or organs
Implementation Method 2
The amount of the magnetization at a particular location of the examination object may be determined, for example, using a Fourier transform that calculates from a signal strength of the magnetic resonance signal that is associated with a particular frequency
Data Source
AI summary
A method for generating at least one acquisition template for an acquisition of magnetic resonance signals, an acquisition template generating unit, a magnetic resonance apparatus and a computer program product. At least one acquisition template is generated with an acquisition template generating unit. The at least one acquisition template has a plurality of spiral-like spokes in a k-space, each spoke having a plurality of spiral points.