MR Reference Data Reuse via Generation Region Difference Detection
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Solution Overview
Problem
Existing parallel imaging techniques in magnetic resonance (MR) imaging require full Nyquist sampling for MR reference data, which leads to increased capture time and potential quality issues due to patient movement.
Innovation Solution
A method for capturing MR data that reduces unnecessary recapture of MR reference data by determining a degree of difference between the generation regions during the capture of first MR reference data and further MR imaging data, allowing for the reuse or modification of existing MR reference data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MR reference data is fully recaptured for each imaging data set, then reconstruction quality is maintained, but capture time increases
Solution Approach 1:
The patent applies partial action by determining whether full recapture of MR reference data is necessary. Instead of always capturing complete reference data, the system performs a difference determination between generation regions and only recaptures reference data when significant changes are detected. This partial approach maintains reconstruction quality when needed while reducing capture time when changes are minimal.
Solution Approach 2:
The patent changes the parameter of reference data capture from a fixed full recapture approach to a dynamic approach based on generation region differences. By monitoring changes in the generation region between imaging data sets, the system adjusts whether to recapture reference data, thereby optimizing the balance between reconstruction quality and capture time.
2Reliability
If MR reference data is recaptured frequently, then patient movement effects are minimized, but capture efficiency decreases
Solution Approach 1:
The patent implements feedback by continuously monitoring the difference between generation regions of current and previous imaging data sets. This feedback mechanism determines whether MR reference data needs to be recaptured, allowing the system to maintain image quality consistency by recapturing only when necessary rather than following a fixed schedule.
Solution Approach 2:
The patent transforms the static approach of fixed-interval reference data recapture into a dynamic approach. The decision to recapture reference data is made dynamically based on the actual change in generation region, allowing the system to adapt to patient movement patterns and maintain reliability without unnecessarily reducing productivity.
3Measurement precision
If full Nyquist sampling is used for MR reference data, then measurement accuracy is ensured, but measurement time increases
Solution Approach 1:
The patent applies partial action by using full Nyquist sampling for MR reference data only when generation region differences indicate it is necessary. When differences are minimal, the system can use previously captured reference data or reduced sampling, thereby maintaining measurement precision when needed while reducing reference data capture duration overall.
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 approach reduces capture time and minimizes the negative impacts of patient movement on image quality by efficiently utilizing existing MR reference data, thereby improving the overall efficiency and quality of MR imaging.
Implementation Method 1
generating at least one excitation pulse with a transmit coil and irradiating the at least one excitation pulse into a patient receiving region
Implementation Method 2
generating MR signals in a generation region within the patient receiving region using the at least one excitation pulse
Implementation Method 3
receiving the MR signals as MR data with a receive coil of the magnetic resonance apparatus
Data Source
AI summary
According to a method, first MR reference data and first MR imaging data are captured. Further MR imaging data is then captured. The capturing includes in each case generating at least one excitation pulse with a transmit coil of the magnetic resonance apparatus and irradiating the at least one excitation pulse into a patient receiving region, generating MR signals in a generation region using the at least one excitation pulse, and receiving the MR signals as MR data with a receive coil. A degree of difference that describes a difference between the generation region on capture of the first MR reference data and the generation region on capture of the further MR imaging data is determined. MR reference data is provided as a function of the degree of difference. An MR image is reconstructed based on the captured further MR imaging data and the provided further MR reference data.