MRI Static Field Correction with Reduced Phase Encoding
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Solution Overview
Problem
The duration of confinement for a subject during data acquisition for static magnetic field correction in magnetic resonance imaging is prolonged, especially in high-resolution imaging, leading to inefficiencies in the imaging process.
Innovation Solution
A magnetic resonance imaging apparatus and method that acquires a first nuclear magnetic resonance signal with a first phase encoding number for static magnetic field correction, followed by a second signal with a higher phase encoding number for main imaging, minimizing the required data acquisition time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data acquisition for static magnetic field correction is performed using the same imaging parameters as main imaging, then correction accuracy is improved, but the duration of confinement for the subject increases
Solution Approach 1:
The patent applies partial action by acquiring correction data with reduced phase encoding numbers compared to main imaging. Instead of acquiring full-resolution correction data, the system acquires sufficient correction data with fewer phase encoding steps, thereby reducing the time required for correction data acquisition while maintaining adequate correction accuracy for the intended application.
2Measurement precision
If high-resolution imaging is performed, then image quality is improved, but the time required to acquire correction data increases
Solution Approach 1:
The patent implements partial action by acquiring correction data with reduced phase encoding numbers that are sufficient for correction purposes but less than what would be required for full main imaging. This allows the system to perform correction data acquisition more quickly while still achieving the necessary correction accuracy, thereby reducing the overall time burden on the subject.
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 reduces the duration of confinement for the subject by optimizing the data acquisition process for static magnetic field correction, ensuring efficient use of time during imaging.
Implementation Method 1
a static magnetic field generating device configured to generate a static magnetic field
Implementation Method 2
induce a nuclear magnetic resonance phenomenon in atomic nuclei (protons) present in any region of the subject
Implementation Method 3
a reception device configured to receive a nuclear magnetic resonance signal generated from the subject
Implementation Method 4
a gradient magnetic field generating device configured to generate a gradient magnetic field in the static magnetic field space
Implementation Method 5
a compensation magnetic field generating device configured to correct inhomogeneity of the static magnetic field
Data Source
AI summary
Provided is a magnetic resonance imaging apparatus that shortens a duration of confinement for a subject during acquisition of data for static magnetic field correction. The magnetic resonance imaging apparatus acquires an imaging site of a subject, sets a first phase encoding number corresponding to the acquired imaging site, controls operations of a transmission device, a reception device, and a gradient magnetic field generating device to acquire a first nuclear magnetic resonance signal with the first phase encoding number, controls the operations of the transmission device, the reception device, and the gradient magnetic field generating device and controls a compensation magnetic field generating device based on the first nuclear magnetic resonance signal to acquire a second nuclear magnetic resonance signal with a second phase encoding number greater than the first phase encoding number, and reconstructs an image of the subject based on the second nuclear magnetic resonance signal.