Nam Gyun Lee

Title: Nam Gyun Lee and MRI Image Reconstruction

Introduction

Nam Gyun Lee is an inventor based in Los Angeles, California, and is associated with the University of Southern California. His patent work addresses image reconstruction for magnetic resonance imaging (MRI), with a focus on reducing image blurring caused by magnetic-field effects.

Latest Patents

Lee is named on 1 patent: “Image Reconstruction Incorporating Maxwell Fields and Gradient Impulse Response Function Distortion.” The invention describes MRI reconstruction methods and systems that mitigate local blurring caused by static off-resonance and concomitant fields.

The approach combines phantom-based gradient impulse response function (GIRF) measurements with analytic expressions to estimate concomitant fields. GIRFs capture gradient delays, eddy-current effects, and mechanically induced field oscillations. By applying input gradients to each gradient axis and using phantom-based GIRF measurements, the system can estimate gradients more accurately than nominal gradient values.

The patent also describes incorporating higher-order Maxwell fields and GIRF-based trajectory corrections into image reconstruction. These corrections can act like “invisible” field probes without requiring special hardware. The analytic model accounts for coil geometry and the severity of gradient nonlinearity.

Career Highlights

Lee’s patent reflects work at the intersection of MRI physics, gradient-field characterization, and computational image reconstruction. The disclosed methods aim to improve image quality by accounting for field distortions that can otherwise contribute to blurring.

Collaborations

The provided information associates Lee with the University of Southern California. It does not specify particular co-inventors or other collaborators.

Conclusion

Nam Gyun Lee’s patent presents a reconstruction approach that combines measured gradient responses and Maxwell-field modeling to address MRI image blurring.