MRI Re-Measurement Control Based on K-Space Position and Continuity
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Solution Overview
Problem
Existing MRI techniques prolong imaging time by repeatedly re-measuring body movement-affected data, leading to inefficiencies due to inadequate determination criteria for re-measurement based on body movement magnitude and k-space position.
Innovation Solution
An MRI apparatus with a body movement processing unit that analyzes body movement-affected data in k-space, determining re-measurement necessity based on position and continuity, optimizing processing to minimize re-measurement frequency and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If body movement-affected data is excluded or re-measured while maintaining image quality, then image quality is preserved, but imaging time is prolonged
Solution Approach 1:
The patent applies local quality by differentiating treatment based on the position of body movement-affected data within k-space. High-frequency region data is handled differently from low-frequency region data, with selective re-measurement criteria applied only where necessary to maintain image quality while minimizing time loss.
Solution Approach 2:
The patent changes the parameter of determination criteria from simple magnitude-based thresholds to a composite criterion incorporating both magnitude and position (k-space region) of body movement-affected data, enabling more precise identification of when re-measurement is actually necessary.
2Measurement precision
If re-measurement is performed repeatedly based on body movement magnitude and k-space position, then image quality is maintained, but imaging time is extended
Solution Approach 1:
The patent performs preliminary analysis of body movement characteristics and k-space data positioning before executing re-measurement. By pre-determining whether re-measurement is necessary based on the combination of movement magnitude and data position, the system avoids unnecessary re-measurement steps.
Solution Approach 2:
The patent implements a feedback mechanism where body movement detection continuously monitors movement characteristics, and the processing unit uses this feedback to dynamically determine whether re-measurement is necessary, adjusting the measurement process in real-time rather than following a fixed repeated measurement protocol.
3Quantity of substance
If determination of re-measurement necessity is made after collection of measurement data of certain proportion, then data collection is completed, but re-measurement is performed unnecessarily extending imaging time
Solution Approach 1:
The patent introduces dynamic determination criteria that adjust during data collection based on real-time body movement detection. Rather than waiting for a fixed proportion of data to be collected before making determination, the system continuously evaluates movement characteristics against the refined criterion (magnitude + position) to dynamically decide on re-measurement necessity.
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
Reduces imaging time while maintaining image quality by minimizing unnecessary re-measurements through precise determination criteria for body movement-affected data in k-space.
Implementation Method 1
imaging is performed by repeatedly applying a radio-frequency magnetic field pulse and a gradient magnetic field pulse according to a predetermined pulse sequence
Implementation Method 2
an imaging unit that collects nuclear magnetic resonance signals of a subject
Data Source
AI summary
The present invention aims to, in a case where measurement data affected by a body movement that occurred during an examination is re-measured, reduce a time extension caused by the re-measurement.Whether or not re-measurement is necessary is determined in consideration of continuity of measurement data affected by a body movement. In addition, in a case of performing the re-measurement, measurement of a part of unmeasured measurement data is omitted in consideration of a measurement time (number of phase encoding steps) of the measurement data to be re-measured.