MRI Gradient Mismatch Correction via Retrospective Factor Selection

The patent applies preliminary action by determining correction factors during a preliminary calibration phase using phantom measurements before actual patient scans. This allows the correction factors to be pre-calculated and stored for later use, avoiding time-consuming corrections during patient examinations. The calibration is performed once during installation or periodically, separating the correction determination from routine patient scans.

The patent uses a phantom copy or simulation model to determine correction factors instead of requiring multiple patient scans. By using a phantom that mimics the imaging conditions and processing multiple images with varying parameters to find optimal correction factors, the system obtains accurate correction data without extending patient measurement time. The phantom serves as a surrogate for actual patient measurements.

The patent implements periodic action by scheduling regular recalibration of correction factors at predetermined intervals during the scanner's operational lifetime. The system automatically or manually triggers recalibration procedures periodically, updating correction factors to account for material aging and drift. This ensures the correction factors remain accurate throughout the scanner's lifetime without requiring continuous adjustments during patient scans.

The patent applies feedback by monitoring scanner performance and automatically triggering recalibration when correction factors become outdated. The system can detect drift in gradient performance through quality control measurements or artifact detection, then initiates recalibration to update correction factors. This closed-loop approach ensures correction factors remain accurate without requiring manual intervention or extending patient scan time.