Segmented bSSFP k-space lines reduce banding artifacts
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Solution Overview
Problem
bSSFP magnetic resonance imaging is sensitive to field inhomogeneities, leading to banding artifacts that can complicate diagnosis and are often mitigated by increasing scan time.
Innovation Solution
The method involves segmenting k-space lines into multiple sections, allowing for shorter repetition times and reduced gradient pulse sequences, which reduces the impact of inhomogeneities and enhances image quality by minimizing banding artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If bSSFP sequence is used for fast imaging, then recording time is short and signal-to-noise ratio is high, but banding artifacts occur due to sensitivity to field inhomogeneities
Solution Approach 1:
The k-space line is divided into multiple segments that are scanned separately in different repetitions of the bSSFP sequence. This segmentation allows for shorter gradient pulse sequences and reduced repetition times, which minimizes the accumulation of phase errors from field inhomogeneities and reduces banding artifacts while maintaining fast imaging capabilities
2Productivity
If conventional bSSFP scanning is used, then complete k-space line is scanned in each repetition, but repetition time is long and banding artifacts increase
Solution Approach 1:
Instead of scanning the complete k-space line in a single repetition, the line is segmented into multiple sections scanned across different repetitions. This reduces the gradient pulse duration and repetition time within each repetition, thereby reducing sensitivity to field inhomogeneities and banding artifacts while maintaining overall scanning efficiency through parallel acquisition
3Object-affected harmful factors
If scan time is increased to reduce banding artifacts, then image quality improves, but total recording time increases
Solution Approach 1:
The k-space line is divided into multiple segments that can be acquired in parallel across different repetitions with shortened repetition times. This segmentation strategy reduces the sensitivity to field inhomogeneities and banding artifacts without requiring a proportional increase in total scan time, as the segments are efficiently acquired through parallel processing
Data Source
AI summary
In a method and magnetic resonance apparatus for recording magnetic resonance data using a bSSFP sequence, a k-space line to be scanned in k-space is divided into at least two line sections, with at least two of the at least two line sections being scanned separately in different repetitions of the sequence.