MRI Blade Sequence Signal Calibration
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Solution Overview
Problem
The combination of simultaneous multi-slice (SMS) and BLADE sequences in MRI techniques prolongs scan time due to the need for separate signal calibration for each blade, neutralizing the advantage of reduced scan time in SMS techniques.
Innovation Solution
An MRI method and device that acquires 3-D data using a surface coil, determines kernel data for each blade, collects aliasing K-space data, performs convolution operations, and reconstructs images, allowing direct determination of kernel data without separate scanning, thereby reducing scan time while maintaining imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SMS technique is used to simultaneously scan multiple slices, then scan time is reduced and imaging speed is improved, but separate signal calibration for each blade is required which prolongs scan time
Solution Approach 1:
The patent merges the signal calibration process into the main imaging sequence by using calibration data acquired from the central region of K-space during the blade sequence scanning. This eliminates the need for separate reference signal scans for each blade, combining what were previously distinct calibration and imaging operations into a unified process that maintains both speed and accuracy.
Solution Approach 2:
The patent performs signal calibration preliminarily by acquiring calibration data from the central region of K-space during the initial stages of the blade sequence scanning. This preliminary calibration data is then reused for reconstructing images from multiple blades, avoiding the need to perform separate calibration for each blade and thus reducing total scan time.
2Manufacturing precision
If blade sequence is used to ensure motion insensitivity, then image definition is improved, but repeated scanning of central K-space area prolongs data acquisition time
Solution Approach 1:
The patent makes the calibration data acquired from the central region of K-space universally applicable to multiple blades. The same calibration data serves for reconstructing images from all blades, eliminating redundant calibration scans and reducing total data acquisition time while maintaining the motion insensitivity benefits of the blade sequence.
Solution Approach 2:
The patent recovers and reuses the calibration data acquired from the central region of K-space across multiple blade reconstructions. Instead of discarding this data after a single use or acquiring new calibration data for each blade, the system recovers and applies the same calibration data to multiple blades, significantly reducing redundant scanning.
3Measurement precision
If separate reference signal scan is performed for each blade, then accurate image reconstruction is achieved, but scan time is greatly increased
Solution Approach 1:
The patent performs signal calibration preliminarily by acquiring calibration data from the central region of K-space during the initial stages of the blade sequence scanning. This preliminary calibration data is then reused for reconstructing images from multiple blades, avoiding the need to perform separate calibration for each blade and thus reducing total scan time while maintaining reconstruction accuracy.
Data Source
AI summary
The present disclosure discloses a magnetic resonance imaging method based on a blade sequence. The method can include acquiring 3-D data collected by a surface coil, determining a corresponding plurality of kernel data of each blade from the 3-D data according to the position information of each blade, collecting a corresponding plurality of slices of aliasing K-space data of each blade, performing convolution operations for the corresponding plurality of slices of aliasing K-space data of each blade and the corresponding plurality of kernel data of each blade to obtain a corresponding plurality of unaliasing K-space data of each blade, and reconstructing images for the corresponding plurality of unaliasing K-space data of different blades to obtain a plurality of unaliasing images. The present disclosure further describes a magnetic resonance imaging device for realizing the method and a computer-readable storage medium.