MRI Phase Shifting Correction Using Pre-Correction Coefficients
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Solution Overview
Problem
Multi-shot echo planar imaging in MRI often experiences phase shifting among shots, leading to artifacts in magnetic resonance images, which requires complex corrections and prolongs imaging and reconstruction processes.
Innovation Solution
A magnetic resonance imaging apparatus that calculates and applies correction coefficients based on pre-correction images to correct phase shifting in the read-out direction, using methods such as correlation optimization or ghost region minimization, thereby reducing processing load and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex correction operations are performed to correct phase shifting in multi-shot imaging, then image quality is improved, but imaging and reconstruction time are prolonged
Solution Approach 1:
The patent applies preliminary action by calculating correction coefficients for phase shifting before the actual image reconstruction process. The system computes these coefficients based on preliminary analysis of the multi-shot data, then applies them during reconstruction to correct phase errors. This preliminary correction approach improves image quality while avoiding the need for complex iterative corrections that would extend processing time.
2Measurement precision
If complex correction operations are performed to correct phase shifting, then phase accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the correction process into distinct, manageable components: (1) calculating correction coefficients from multi-shot data, (2) applying these coefficients to correct phase shifting in the read-out direction, and (3) performing standard image reconstruction. This segmentation reduces processing complexity by breaking down the complex correction operation into systematic steps that can be efficiently implemented.
3Manufacturing precision
If simultaneous frequency encoding correction is performed along with phase shifting correction, then correction accuracy is improved, but processing load increases
Solution Approach 1:
The patent extracts and addresses only the critical phase shifting correction in the read-out direction, rather than simultaneously performing comprehensive frequency encoding correction across all directions. By focusing specifically on the read-out direction phase errors, the system achieves sufficient correction accuracy while significantly reducing the processing load compared to full multi-dimensional correction approaches.
Data Source
AI summary
A magnetic resonance imaging apparatus according to an embodiment includes a processing circuitry. Regarding the k-space data obtained as a result of performing multi-shot imaging that includes a plurality of shots, the processing circuitry obtains a correction coefficient, based on first-type magnetic resonance images generated using the k-space data, the correction coefficient correcting phase shifting occurring in read out direction among the plurality of shots. Then, the processing circuitry corrects the k-space data based on the correction coefficients. Moreover, the processing circuitry generates a second-type magnetic resonance image using the corrected k-space data.