Magnetic Resonance B0 Field Prediction for Faster Position Scanning
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Solution Overview
Problem
The uniformity of the static magnetic field B0 in magnetic resonance imaging (MRI) is disturbed by the patient's body during scanning, leading to image quality issues, and obtaining a new B0 field map at each scan position increases scanning time.
Innovation Solution
A predicted overall B0 field map is calculated using a background and previous B0 field map, allowing imaging scans to be performed without re-scanning, and adjusting scan parameters based on the predicted map to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a new B0 field map is obtained by scanning at each scan position, then image quality is maintained, but scanning time increases
Solution Approach 1:
A predicted overall B0 field map is obtained in advance based on a background B0 field map and a disturbance B0 field map from a previous scan position, eliminating the need to perform a new B0 field scan at each current scan position while maintaining sufficient accuracy for image quality
Solution Approach 2:
The disturbance B0 field map from a previous scan position is copied and adapted to predict the overall B0 field map at the current scan position, avoiding the need to重新 acquire the complete field map through scanning
2Manufacturing precision
If shim calibration is performed during installation or maintenance, then static magnetic field uniformity is improved, but the disturbance caused by patient body during scanning cannot be addressed
Solution Approach 1:
A disturbance B0 field map is obtained in advance from a previous scan position, capturing the patient body's effect on the magnetic field before the current scan, allowing prediction and compensation of field disturbances specific to the patient's anatomy
Solution Approach 2:
The approach transitions from static shim calibration performed during installation to dynamic prediction of B0 field maps that adapt to patient-specific disturbances by utilizing data from previous scan positions
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 method maintains image quality by using a predicted B0 field map, reducing scanning time and avoiding the need for additional B0 field scans.
Implementation Method 1
nuclear spin associated with hydrogen nuclei (or other nuclides) in tissue of the part to be imaged is polarized, so that the tissue of the part to be imaged generates a longitudinal magnetization vector at a macroscopic level
Implementation Method 2
After a radio-frequency field B1 intersecting the direction of the static magnetic field B0 is applied, the direction of rotation of protons changes so that the tissue of the part to be imaged generates a transverse magnetization vector at a macroscopic level
Implementation Method 3
After the radio-frequency field B1 is removed, the transverse magnetization vector decays in a spiral manner until it is restored to zero. A free induction decay signal is generated during decay.
Data Source
AI summary
Embodiments of the present invention provide a magnetic resonance scanning method and system and a computer-readable storage medium. The method comprises: when an imaging volume of an object is at a current position, performing a current imaging scan on the imaging volume based on a predicted overall B0 field map at the current position.