Labeling Area Tilt Determination for Arterial Spin Labeling MRI
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Solution Overview
Problem
In ASL imaging, determining a suitable labeling area is challenging due to changes in head posture, which affects the alignment of blood vessels around the circle of Willis, leading to inconsistent labeling timing across different postures.
Innovation Solution
A system that detects the tilt of the head relative to the body axial direction and determines the tilt of the labeling area based on this detection, adjusting the normal direction of the labeling area to align with the blood flow direction, even when the head posture changes, using a detecting device and determining device within a magnetic resonance apparatus or a program.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the labeling area is determined based on the body axial direction of the subject, then the labeling area can be consistently defined, but the labeling timing varies when the head posture changes
Solution Approach 1:
The patent applies the dynamics principle by making the labeling area orientation adaptive rather than fixed. The system dynamically adjusts the labeling area's normal direction based on detected head tilt angles, allowing the labeling plane to rotate and reorient according to the subject's actual head posture. This dynamic adjustment ensures that the labeling area consistently faces the blood flow direction regardless of head position changes.
Solution Approach 2:
The patent implements parameter changes by modifying the orientation parameters of the labeling area based on detected head tilt angles. The system changes the normal direction vectors of the labeling plane according to measured angular deviations from the standard body axial direction, thereby adapting the labeling geometry to match the actual anatomical orientation in different postures.
2Ease of operation
If the labeling area normal direction is fixed along the body axial direction, then the system is simple to operate, but it does not account for head tilt variations
Solution Approach 1:
The system applies the self-service principle by automatically detecting head tilt angles and computing the adjusted labeling area orientation without requiring manual intervention. The apparatus autonomously measures the head posture, calculates the appropriate rotation angles, and reorients the labeling plane accordingly, eliminating the need for operators to manually adjust parameters while maintaining simplicity of use.
Solution Approach 2:
The patent implements feedback by using detected head tilt angle information to continuously adjust the labeling area orientation. The system measures the actual head posture, compares it with the reference body axial direction, and uses this feedback to compute and apply the necessary orientation corrections, ensuring accurate alignment with the blood flow direction.
Data Source
AI summary
A labeling area determining apparatus is provided. The labeling area determining apparatus includes a detecting device configured to detect a tilt of a head relative to a body axial direction of a subject to be imaged by an arterial spin labeling method, and a determining device configured to determine a tilt of a labeling area of spins relative to the body axial direction of the subject, based on the tilt of the head detected by the detecting device.