MRI Motion Detection Using Auxiliary Scan Sequences

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Solution Overview

Problem

Existing magnetic resonance imaging (MRI) systems struggle to detect and correct for motion artifacts in real-time, leading to suboptimal imaging quality due to uncertainties in the motion state of scanned objects during the scanning process.

Innovation Solution

A method and system for motion detection in MRI that utilizes auxiliary sequences inserted in imaging sub-sequences to obtain auxiliary magnetic resonance data, allowing for real-time determination of motion state information by processing this data to adjust and improve imaging quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If auxiliary sequences are inserted in imaging sub-sequences to detect motion in real-time, then motion detection capability is improved, but device complexity increases

Engineering Contradiction:

Improvemotion detection capabilityVSAvoidsequence structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The imaging sequence is divided into multiple imaging sub-sequences with auxiliary sequences inserted between them. Each auxiliary sequence independently detects motion in specific directions, allowing modular motion detection without redesigning the entire imaging sequence.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Auxiliary sequences act as intermediary components inserted between imaging sub-sequences. These auxiliary sequences detect motion artifacts without interfering with the primary imaging function, serving as mediators that provide motion information while maintaining image quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If auxiliary sequences are inserted to obtain motion state information, then motion artifact correction is improved, but scanning time increases

Engineering Contradiction:

Improveimage qualityVSAvoidscanning time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Instead of implementing full motion correction for the entire imaging sequence, the system inserts auxiliary sequences at specific positions to detect motion only when necessary. This partial action approach provides sufficient motion information for correction without adding excessive scanning time.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

Auxiliary sequences are inserted periodically between imaging sub-sequences rather than continuously throughout the entire scan. This periodic insertion provides motion detection at regular intervals, enabling timely motion artifact correction while minimizing the total time added to the scanning process.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20250362366A1Methods and systems for motion detection in magnetic resonance imaging

Publication Date: 2025.11.27 SHANGHAI UNITED IMAGING HEALTHCARE

AI summary

The present disclosure provides methods, and systems for motion detection in magnetic resonance imaging. The method may include obtaining auxiliary magnetic resonance data of a target object by scanning the target object using an auxiliary sequence inserted in at least two imaging sub-sequences in a magnetic resonance imaging process of the target object, wherein the auxiliary sequence includes a plurality of auxiliary sub-sequences inserted at different positions in the at least two imaging sub-sequences; and determining, based on the auxiliary magnetic resonance data, motion state information of a region of interest of the target object.